xref: /external/chromium_org/third_party/bintrees/bintrees/cwalker.c

/* Generated by Cython 0.17.4 on Sun Feb 24 19:48:34 2013 */

#define PY_SSIZE_T_CLEAN
#include "Python.h"
#ifndef Py_PYTHON_H
    #error Python headers needed to compile C extensions, please install development version of Python.
#elif PY_VERSION_HEX < 0x02040000
    #error Cython requires Python 2.4+.
#else
#include <stddef.h> /* For offsetof */
#ifndef offsetof
#define offsetof(type, member) ( (size_t) & ((type*)0) -> member )
#endif
#if !defined(WIN32) && !defined(MS_WINDOWS)
  #ifndef __stdcall
    #define __stdcall
  #endif
  #ifndef __cdecl
    #define __cdecl
  #endif
  #ifndef __fastcall
    #define __fastcall
  #endif
#endif
#ifndef DL_IMPORT
  #define DL_IMPORT(t) t
#endif
#ifndef DL_EXPORT
  #define DL_EXPORT(t) t
#endif
#ifndef PY_LONG_LONG
  #define PY_LONG_LONG LONG_LONG
#endif
#ifndef Py_HUGE_VAL
  #define Py_HUGE_VAL HUGE_VAL
#endif
#ifdef PYPY_VERSION
#define CYTHON_COMPILING_IN_PYPY 1
#define CYTHON_COMPILING_IN_CPYTHON 0
#else
#define CYTHON_COMPILING_IN_PYPY 0
#define CYTHON_COMPILING_IN_CPYTHON 1
#endif
#if PY_VERSION_HEX < 0x02050000
  typedef int Py_ssize_t;
  #define PY_SSIZE_T_MAX INT_MAX
  #define PY_SSIZE_T_MIN INT_MIN
  #define PY_FORMAT_SIZE_T ""
  #define CYTHON_FORMAT_SSIZE_T ""
  #define PyInt_FromSsize_t(z) PyInt_FromLong(z)
  #define PyInt_AsSsize_t(o)   __Pyx_PyInt_AsInt(o)
  #define PyNumber_Index(o)    ((PyNumber_Check(o) && !PyFloat_Check(o)) ? PyNumber_Int(o) : \
                                (PyErr_Format(PyExc_TypeError, \
                                              "expected index value, got %.200s", Py_TYPE(o)->tp_name), \
                                 (PyObject*)0))
  #define __Pyx_PyIndex_Check(o) (PyNumber_Check(o) && !PyFloat_Check(o) && \
                                  !PyComplex_Check(o))
  #define PyIndex_Check __Pyx_PyIndex_Check
  #define PyErr_WarnEx(category, message, stacklevel) PyErr_Warn(category, message)
  #define __PYX_BUILD_PY_SSIZE_T "i"
#else
  #define __PYX_BUILD_PY_SSIZE_T "n"
  #define CYTHON_FORMAT_SSIZE_T "z"
  #define __Pyx_PyIndex_Check PyIndex_Check
#endif
#if PY_VERSION_HEX < 0x02060000
  #define Py_REFCNT(ob) (((PyObject*)(ob))->ob_refcnt)
  #define Py_TYPE(ob)   (((PyObject*)(ob))->ob_type)
  #define Py_SIZE(ob)   (((PyVarObject*)(ob))->ob_size)
  #define PyVarObject_HEAD_INIT(type, size) \
          PyObject_HEAD_INIT(type) size,
  #define PyType_Modified(t)
  typedef struct {
     void *buf;
     PyObject *obj;
     Py_ssize_t len;
     Py_ssize_t itemsize;
     int readonly;
     int ndim;
     char *format;
     Py_ssize_t *shape;
     Py_ssize_t *strides;
     Py_ssize_t *suboffsets;
     void *internal;
  } Py_buffer;
  #define PyBUF_SIMPLE 0
  #define PyBUF_WRITABLE 0x0001
  #define PyBUF_FORMAT 0x0004
  #define PyBUF_ND 0x0008
  #define PyBUF_STRIDES (0x0010 | PyBUF_ND)
  #define PyBUF_C_CONTIGUOUS (0x0020 | PyBUF_STRIDES)
  #define PyBUF_F_CONTIGUOUS (0x0040 | PyBUF_STRIDES)
  #define PyBUF_ANY_CONTIGUOUS (0x0080 | PyBUF_STRIDES)
  #define PyBUF_INDIRECT (0x0100 | PyBUF_STRIDES)
  #define PyBUF_RECORDS (PyBUF_STRIDES | PyBUF_FORMAT | PyBUF_WRITABLE)
  #define PyBUF_FULL (PyBUF_INDIRECT | PyBUF_FORMAT | PyBUF_WRITABLE)
  typedef int (*getbufferproc)(PyObject *, Py_buffer *, int);
  typedef void (*releasebufferproc)(PyObject *, Py_buffer *);
#endif
#if PY_MAJOR_VERSION < 3
  #define __Pyx_BUILTIN_MODULE_NAME "__builtin__"
  #define __Pyx_PyCode_New(a, k, l, s, f, code, c, n, v, fv, cell, fn, name, fline, lnos) \
          PyCode_New(a, l, s, f, code, c, n, v, fv, cell, fn, name, fline, lnos)
#else
  #define __Pyx_BUILTIN_MODULE_NAME "builtins"
  #define __Pyx_PyCode_New(a, k, l, s, f, code, c, n, v, fv, cell, fn, name, fline, lnos) \
          PyCode_New(a, k, l, s, f, code, c, n, v, fv, cell, fn, name, fline, lnos)
#endif
#if PY_MAJOR_VERSION < 3 && PY_MINOR_VERSION < 6
  #define PyUnicode_FromString(s) PyUnicode_Decode(s, strlen(s), "UTF-8", "strict")
#endif
#if PY_MAJOR_VERSION >= 3
  #define Py_TPFLAGS_CHECKTYPES 0
  #define Py_TPFLAGS_HAVE_INDEX 0
#endif
#if (PY_VERSION_HEX < 0x02060000) || (PY_MAJOR_VERSION >= 3)
  #define Py_TPFLAGS_HAVE_NEWBUFFER 0
#endif
#if PY_VERSION_HEX > 0x03030000 && defined(PyUnicode_KIND)
  #define CYTHON_PEP393_ENABLED 1
  #define __Pyx_PyUnicode_READY(op)       (likely(PyUnicode_IS_READY(op)) ? \
                                              0 : _PyUnicode_Ready((PyObject *)(op)))
  #define __Pyx_PyUnicode_GET_LENGTH(u)   PyUnicode_GET_LENGTH(u)
  #define __Pyx_PyUnicode_READ_CHAR(u, i) PyUnicode_READ_CHAR(u, i)
  #define __Pyx_PyUnicode_READ(k, d, i)   PyUnicode_READ(k, d, i)
#else
  #define CYTHON_PEP393_ENABLED 0
  #define __Pyx_PyUnicode_READY(op)       (0)
  #define __Pyx_PyUnicode_GET_LENGTH(u)   PyUnicode_GET_SIZE(u)
  #define __Pyx_PyUnicode_READ_CHAR(u, i) ((Py_UCS4)(PyUnicode_AS_UNICODE(u)[i]))
  #define __Pyx_PyUnicode_READ(k, d, i)   ((k=k), (Py_UCS4)(((Py_UNICODE*)d)[i]))
#endif
#if PY_MAJOR_VERSION >= 3
  #define PyBaseString_Type            PyUnicode_Type
  #define PyStringObject               PyUnicodeObject
  #define PyString_Type                PyUnicode_Type
  #define PyString_Check               PyUnicode_Check
  #define PyString_CheckExact          PyUnicode_CheckExact
#endif
#if PY_VERSION_HEX < 0x02060000
  #define PyBytesObject                PyStringObject
  #define PyBytes_Type                 PyString_Type
  #define PyBytes_Check                PyString_Check
  #define PyBytes_CheckExact           PyString_CheckExact
  #define PyBytes_FromString           PyString_FromString
  #define PyBytes_FromStringAndSize    PyString_FromStringAndSize
  #define PyBytes_FromFormat           PyString_FromFormat
  #define PyBytes_DecodeEscape         PyString_DecodeEscape
  #define PyBytes_AsString             PyString_AsString
  #define PyBytes_AsStringAndSize      PyString_AsStringAndSize
  #define PyBytes_Size                 PyString_Size
  #define PyBytes_AS_STRING            PyString_AS_STRING
  #define PyBytes_GET_SIZE             PyString_GET_SIZE
  #define PyBytes_Repr                 PyString_Repr
  #define PyBytes_Concat               PyString_Concat
  #define PyBytes_ConcatAndDel         PyString_ConcatAndDel
#endif
#if PY_VERSION_HEX < 0x02060000
  #define PySet_Check(obj)             PyObject_TypeCheck(obj, &PySet_Type)
  #define PyFrozenSet_Check(obj)       PyObject_TypeCheck(obj, &PyFrozenSet_Type)
#endif
#ifndef PySet_CheckExact
  #define PySet_CheckExact(obj)        (Py_TYPE(obj) == &PySet_Type)
#endif
#define __Pyx_TypeCheck(obj, type) PyObject_TypeCheck(obj, (PyTypeObject *)type)
#if PY_MAJOR_VERSION >= 3
  #define PyIntObject                  PyLongObject
  #define PyInt_Type                   PyLong_Type
  #define PyInt_Check(op)              PyLong_Check(op)
  #define PyInt_CheckExact(op)         PyLong_CheckExact(op)
  #define PyInt_FromString             PyLong_FromString
  #define PyInt_FromUnicode            PyLong_FromUnicode
  #define PyInt_FromLong               PyLong_FromLong
  #define PyInt_FromSize_t             PyLong_FromSize_t
  #define PyInt_FromSsize_t            PyLong_FromSsize_t
  #define PyInt_AsLong                 PyLong_AsLong
  #define PyInt_AS_LONG                PyLong_AS_LONG
  #define PyInt_AsSsize_t              PyLong_AsSsize_t
  #define PyInt_AsUnsignedLongMask     PyLong_AsUnsignedLongMask
  #define PyInt_AsUnsignedLongLongMask PyLong_AsUnsignedLongLongMask
#endif
#if PY_MAJOR_VERSION >= 3
  #define PyBoolObject                 PyLongObject
#endif
#if PY_VERSION_HEX < 0x03020000
  typedef long Py_hash_t;
  #define __Pyx_PyInt_FromHash_t PyInt_FromLong
  #define __Pyx_PyInt_AsHash_t   PyInt_AsLong
#else
  #define __Pyx_PyInt_FromHash_t PyInt_FromSsize_t
  #define __Pyx_PyInt_AsHash_t   PyInt_AsSsize_t
#endif
#if (PY_MAJOR_VERSION < 3) || (PY_VERSION_HEX >= 0x03010300)
  #define __Pyx_PySequence_GetSlice(obj, a, b) PySequence_GetSlice(obj, a, b)
  #define __Pyx_PySequence_SetSlice(obj, a, b, value) PySequence_SetSlice(obj, a, b, value)
  #define __Pyx_PySequence_DelSlice(obj, a, b) PySequence_DelSlice(obj, a, b)
#else
  #define __Pyx_PySequence_GetSlice(obj, a, b) (unlikely(!(obj)) ? \
        (PyErr_SetString(PyExc_SystemError, "null argument to internal routine"), (PyObject*)0) : \
        (likely((obj)->ob_type->tp_as_mapping) ? (PySequence_GetSlice(obj, a, b)) : \
            (PyErr_Format(PyExc_TypeError, "'%.200s' object is unsliceable", (obj)->ob_type->tp_name), (PyObject*)0)))
  #define __Pyx_PySequence_SetSlice(obj, a, b, value) (unlikely(!(obj)) ? \
        (PyErr_SetString(PyExc_SystemError, "null argument to internal routine"), -1) : \
        (likely((obj)->ob_type->tp_as_mapping) ? (PySequence_SetSlice(obj, a, b, value)) : \
            (PyErr_Format(PyExc_TypeError, "'%.200s' object doesn't support slice assignment", (obj)->ob_type->tp_name), -1)))
  #define __Pyx_PySequence_DelSlice(obj, a, b) (unlikely(!(obj)) ? \
        (PyErr_SetString(PyExc_SystemError, "null argument to internal routine"), -1) : \
        (likely((obj)->ob_type->tp_as_mapping) ? (PySequence_DelSlice(obj, a, b)) : \
            (PyErr_Format(PyExc_TypeError, "'%.200s' object doesn't support slice deletion", (obj)->ob_type->tp_name), -1)))
#endif
#if PY_MAJOR_VERSION >= 3
  #define PyMethod_New(func, self, klass) ((self) ? PyMethod_New(func, self) : PyInstanceMethod_New(func))
#endif
#if PY_VERSION_HEX < 0x02050000
  #define __Pyx_GetAttrString(o,n)   PyObject_GetAttrString((o),((char *)(n)))
  #define __Pyx_SetAttrString(o,n,a) PyObject_SetAttrString((o),((char *)(n)),(a))
  #define __Pyx_DelAttrString(o,n)   PyObject_DelAttrString((o),((char *)(n)))
#else
  #define __Pyx_GetAttrString(o,n)   PyObject_GetAttrString((o),(n))
  #define __Pyx_SetAttrString(o,n,a) PyObject_SetAttrString((o),(n),(a))
  #define __Pyx_DelAttrString(o,n)   PyObject_DelAttrString((o),(n))
#endif
#if PY_VERSION_HEX < 0x02050000
  #define __Pyx_NAMESTR(n) ((char *)(n))
  #define __Pyx_DOCSTR(n)  ((char *)(n))
#else
  #define __Pyx_NAMESTR(n) (n)
  #define __Pyx_DOCSTR(n)  (n)
#endif


#if PY_MAJOR_VERSION >= 3
  #define __Pyx_PyNumber_Divide(x,y)         PyNumber_TrueDivide(x,y)
  #define __Pyx_PyNumber_InPlaceDivide(x,y)  PyNumber_InPlaceTrueDivide(x,y)
#else
  #define __Pyx_PyNumber_Divide(x,y)         PyNumber_Divide(x,y)
  #define __Pyx_PyNumber_InPlaceDivide(x,y)  PyNumber_InPlaceDivide(x,y)
#endif

#ifndef __PYX_EXTERN_C
  #ifdef __cplusplus
    #define __PYX_EXTERN_C extern "C"
  #else
    #define __PYX_EXTERN_C extern
  #endif
#endif

#if defined(WIN32) || defined(MS_WINDOWS)
#define _USE_MATH_DEFINES
#endif
#include <math.h>
#define __PYX_HAVE__bintrees__cwalker
#define __PYX_HAVE_API__bintrees__cwalker
#include "ctrees.h"
#include "stack.h"
#ifdef _OPENMP
#include <omp.h>
#endif /* _OPENMP */

#ifdef PYREX_WITHOUT_ASSERTIONS
#define CYTHON_WITHOUT_ASSERTIONS
#endif


/* inline attribute */
#ifndef CYTHON_INLINE
  #if defined(__GNUC__)
    #define CYTHON_INLINE __inline__
  #elif defined(_MSC_VER)
    #define CYTHON_INLINE __inline
  #elif defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
    #define CYTHON_INLINE inline
  #else
    #define CYTHON_INLINE
  #endif
#endif

/* unused attribute */
#ifndef CYTHON_UNUSED
# if defined(__GNUC__)
#   if !(defined(__cplusplus)) || (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))
#     define CYTHON_UNUSED __attribute__ ((__unused__))
#   else
#     define CYTHON_UNUSED
#   endif
# elif defined(__ICC) || (defined(__INTEL_COMPILER) && !defined(_MSC_VER))
#   define CYTHON_UNUSED __attribute__ ((__unused__))
# else
#   define CYTHON_UNUSED
# endif
#endif

typedef struct {PyObject **p; char *s; const long n; const char* encoding; const char is_unicode; const char is_str; const char intern; } __Pyx_StringTabEntry; /*proto*/


/* Type Conversion Predeclarations */

#define __Pyx_PyBytes_FromUString(s) PyBytes_FromString((char*)s)
#define __Pyx_PyBytes_AsUString(s)   ((unsigned char*) PyBytes_AsString(s))

#define __Pyx_Owned_Py_None(b) (Py_INCREF(Py_None), Py_None)
#define __Pyx_PyBool_FromLong(b) ((b) ? (Py_INCREF(Py_True), Py_True) : (Py_INCREF(Py_False), Py_False))
static CYTHON_INLINE int __Pyx_PyObject_IsTrue(PyObject*);
static CYTHON_INLINE PyObject* __Pyx_PyNumber_Int(PyObject* x);

static CYTHON_INLINE Py_ssize_t __Pyx_PyIndex_AsSsize_t(PyObject*);
static CYTHON_INLINE PyObject * __Pyx_PyInt_FromSize_t(size_t);
static CYTHON_INLINE size_t __Pyx_PyInt_AsSize_t(PyObject*);

#if CYTHON_COMPILING_IN_CPYTHON
#define __pyx_PyFloat_AsDouble(x) (PyFloat_CheckExact(x) ? PyFloat_AS_DOUBLE(x) : PyFloat_AsDouble(x))
#else
#define __pyx_PyFloat_AsDouble(x) PyFloat_AsDouble(x)
#endif
#define __pyx_PyFloat_AsFloat(x) ((float) __pyx_PyFloat_AsDouble(x))

#ifdef __GNUC__
  /* Test for GCC > 2.95 */
  #if __GNUC__ > 2 || (__GNUC__ == 2 && (__GNUC_MINOR__ > 95))
    #define likely(x)   __builtin_expect(!!(x), 1)
    #define unlikely(x) __builtin_expect(!!(x), 0)
  #else /* __GNUC__ > 2 ... */
    #define likely(x)   (x)
    #define unlikely(x) (x)
  #endif /* __GNUC__ > 2 ... */
#else /* __GNUC__ */
  #define likely(x)   (x)
  #define unlikely(x) (x)
#endif /* __GNUC__ */

static PyObject *__pyx_m;
static PyObject *__pyx_b;
static PyObject *__pyx_empty_tuple;
static PyObject *__pyx_empty_bytes;
static int __pyx_lineno;
static int __pyx_clineno = 0;
static const char * __pyx_cfilenm= __FILE__;
static const char *__pyx_filename;


static const char *__pyx_f[] = {
  "cwalker.pyx",
};

/*--- Type declarations ---*/
struct __pyx_obj_8bintrees_7cwalker_cWalker;

/* "bintrees\cwalker.pxd":11
 * from stack cimport node_stack_t
 *
 * cdef class cWalker:             # <<<<<<<<<<<<<<
 *     cdef node_t *node
 *     cdef node_t *root
 */
struct __pyx_obj_8bintrees_7cwalker_cWalker {
  PyObject_HEAD
  struct __pyx_vtabstruct_8bintrees_7cwalker_cWalker *__pyx_vtab;
  node_t *node;
  node_t *root;
  node_stack_t *stack;
};



/* "bintrees\cwalker.pyx":14
 * from ctrees cimport *
 *
 * cdef class cWalker:             # <<<<<<<<<<<<<<
 *     def __cinit__(self):
 *         self.root = NULL
 */

struct __pyx_vtabstruct_8bintrees_7cwalker_cWalker {
  void (*set_tree)(struct __pyx_obj_8bintrees_7cwalker_cWalker *, node_t *);
  PyObject *(*reset)(struct __pyx_obj_8bintrees_7cwalker_cWalker *, int __pyx_skip_dispatch);
  PyObject *(*push)(struct __pyx_obj_8bintrees_7cwalker_cWalker *, int __pyx_skip_dispatch);
  PyObject *(*pop)(struct __pyx_obj_8bintrees_7cwalker_cWalker *, int __pyx_skip_dispatch);
};
static struct __pyx_vtabstruct_8bintrees_7cwalker_cWalker *__pyx_vtabptr_8bintrees_7cwalker_cWalker;
#ifndef CYTHON_REFNANNY
  #define CYTHON_REFNANNY 0
#endif
#if CYTHON_REFNANNY
  typedef struct {
    void (*INCREF)(void*, PyObject*, int);
    void (*DECREF)(void*, PyObject*, int);
    void (*GOTREF)(void*, PyObject*, int);
    void (*GIVEREF)(void*, PyObject*, int);
    void* (*SetupContext)(const char*, int, const char*);
    void (*FinishContext)(void**);
  } __Pyx_RefNannyAPIStruct;
  static __Pyx_RefNannyAPIStruct *__Pyx_RefNanny = NULL;
  static __Pyx_RefNannyAPIStruct *__Pyx_RefNannyImportAPI(const char *modname); /*proto*/
  #define __Pyx_RefNannyDeclarations void *__pyx_refnanny = NULL;
#ifdef WITH_THREAD
  #define __Pyx_RefNannySetupContext(name, acquire_gil) \
          if (acquire_gil) { \
              PyGILState_STATE __pyx_gilstate_save = PyGILState_Ensure(); \
              __pyx_refnanny = __Pyx_RefNanny->SetupContext((name), __LINE__, __FILE__); \
              PyGILState_Release(__pyx_gilstate_save); \
          } else { \
              __pyx_refnanny = __Pyx_RefNanny->SetupContext((name), __LINE__, __FILE__); \
          }
#else
  #define __Pyx_RefNannySetupContext(name, acquire_gil) \
          __pyx_refnanny = __Pyx_RefNanny->SetupContext((name), __LINE__, __FILE__)
#endif
  #define __Pyx_RefNannyFinishContext() \
          __Pyx_RefNanny->FinishContext(&__pyx_refnanny)
  #define __Pyx_INCREF(r)  __Pyx_RefNanny->INCREF(__pyx_refnanny, (PyObject *)(r), __LINE__)
  #define __Pyx_DECREF(r)  __Pyx_RefNanny->DECREF(__pyx_refnanny, (PyObject *)(r), __LINE__)
  #define __Pyx_GOTREF(r)  __Pyx_RefNanny->GOTREF(__pyx_refnanny, (PyObject *)(r), __LINE__)
  #define __Pyx_GIVEREF(r) __Pyx_RefNanny->GIVEREF(__pyx_refnanny, (PyObject *)(r), __LINE__)
  #define __Pyx_XINCREF(r)  do { if((r) != NULL) {__Pyx_INCREF(r); }} while(0)
  #define __Pyx_XDECREF(r)  do { if((r) != NULL) {__Pyx_DECREF(r); }} while(0)
  #define __Pyx_XGOTREF(r)  do { if((r) != NULL) {__Pyx_GOTREF(r); }} while(0)
  #define __Pyx_XGIVEREF(r) do { if((r) != NULL) {__Pyx_GIVEREF(r);}} while(0)
#else
  #define __Pyx_RefNannyDeclarations
  #define __Pyx_RefNannySetupContext(name, acquire_gil)
  #define __Pyx_RefNannyFinishContext()
  #define __Pyx_INCREF(r) Py_INCREF(r)
  #define __Pyx_DECREF(r) Py_DECREF(r)
  #define __Pyx_GOTREF(r)
  #define __Pyx_GIVEREF(r)
  #define __Pyx_XINCREF(r) Py_XINCREF(r)
  #define __Pyx_XDECREF(r) Py_XDECREF(r)
  #define __Pyx_XGOTREF(r)
  #define __Pyx_XGIVEREF(r)
#endif /* CYTHON_REFNANNY */
#define __Pyx_CLEAR(r)    do { PyObject* tmp = ((PyObject*)(r)); r = NULL; __Pyx_DECREF(tmp);} while(0)
#define __Pyx_XCLEAR(r)   do { if((r) != NULL) {PyObject* tmp = ((PyObject*)(r)); r = NULL; __Pyx_DECREF(tmp);}} while(0)

static PyObject *__Pyx_GetName(PyObject *dict, PyObject *name); /*proto*/

static void __Pyx_RaiseArgtupleInvalid(const char* func_name, int exact,
    Py_ssize_t num_min, Py_ssize_t num_max, Py_ssize_t num_found); /*proto*/

static CYTHON_INLINE int __Pyx_CheckKeywordStrings(PyObject *kwdict, const char* function_name, int kw_allowed); /*proto*/

static CYTHON_INLINE void __Pyx_ErrRestore(PyObject *type, PyObject *value, PyObject *tb); /*proto*/
static CYTHON_INLINE void __Pyx_ErrFetch(PyObject **type, PyObject **value, PyObject **tb); /*proto*/

static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb, PyObject *cause); /*proto*/

static CYTHON_INLINE unsigned char __Pyx_PyInt_AsUnsignedChar(PyObject *);

static CYTHON_INLINE unsigned short __Pyx_PyInt_AsUnsignedShort(PyObject *);

static CYTHON_INLINE unsigned int __Pyx_PyInt_AsUnsignedInt(PyObject *);

static CYTHON_INLINE char __Pyx_PyInt_AsChar(PyObject *);

static CYTHON_INLINE short __Pyx_PyInt_AsShort(PyObject *);

static CYTHON_INLINE int __Pyx_PyInt_AsInt(PyObject *);

static CYTHON_INLINE signed char __Pyx_PyInt_AsSignedChar(PyObject *);

static CYTHON_INLINE signed short __Pyx_PyInt_AsSignedShort(PyObject *);

static CYTHON_INLINE signed int __Pyx_PyInt_AsSignedInt(PyObject *);

static CYTHON_INLINE int __Pyx_PyInt_AsLongDouble(PyObject *);

static CYTHON_INLINE unsigned long __Pyx_PyInt_AsUnsignedLong(PyObject *);

static CYTHON_INLINE unsigned PY_LONG_LONG __Pyx_PyInt_AsUnsignedLongLong(PyObject *);

static CYTHON_INLINE long __Pyx_PyInt_AsLong(PyObject *);

static CYTHON_INLINE PY_LONG_LONG __Pyx_PyInt_AsLongLong(PyObject *);

static CYTHON_INLINE signed long __Pyx_PyInt_AsSignedLong(PyObject *);

static CYTHON_INLINE signed PY_LONG_LONG __Pyx_PyInt_AsSignedLongLong(PyObject *);

static void __Pyx_WriteUnraisable(const char *name, int clineno,
                                  int lineno, const char *filename); /*proto*/

static int __Pyx_check_binary_version(void);

static int __Pyx_SetVtable(PyObject *dict, void *vtable); /*proto*/

typedef struct {
    int code_line;
    PyCodeObject* code_object;
} __Pyx_CodeObjectCacheEntry;
struct __Pyx_CodeObjectCache {
    int count;
    int max_count;
    __Pyx_CodeObjectCacheEntry* entries;
};
static struct __Pyx_CodeObjectCache __pyx_code_cache = {0,0,NULL};
static int __pyx_bisect_code_objects(__Pyx_CodeObjectCacheEntry* entries, int count, int code_line);
static PyCodeObject *__pyx_find_code_object(int code_line);
static void __pyx_insert_code_object(int code_line, PyCodeObject* code_object);

static void __Pyx_AddTraceback(const char *funcname, int c_line,
                               int py_line, const char *filename); /*proto*/

static int __Pyx_InitStrings(__Pyx_StringTabEntry *t); /*proto*/


/* Module declarations from 'bintrees.ctrees' */

/* Module declarations from 'bintrees.stack' */

/* Module declarations from 'bintrees.cwalker' */
static PyTypeObject *__pyx_ptype_8bintrees_7cwalker_cWalker = 0;
#define __Pyx_MODULE_NAME "bintrees.cwalker"
int __pyx_module_is_main_bintrees__cwalker = 0;

/* Implementation of 'bintrees.cwalker' */
static PyObject *__pyx_builtin_property;
static PyObject *__pyx_builtin_IndexError;
static PyObject *__pyx_builtin_KeyError;
static int __pyx_pf_8bintrees_7cwalker_7cWalker___cinit__(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self); /* proto */
static void __pyx_pf_8bintrees_7cwalker_7cWalker_2__dealloc__(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self); /* proto */
static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_4reset(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self); /* proto */
static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_6key(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self); /* proto */
static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_8value(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self); /* proto */
static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_10item(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self); /* proto */
static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_12is_valid(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self); /* proto */
static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_14goto(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self, PyObject *__pyx_v_key); /* proto */
static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_16push(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self); /* proto */
static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_18pop(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self); /* proto */
static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_20stack_is_empty(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self); /* proto */
static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_22goto_leaf(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self); /* proto */
static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_24has_child(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self, int __pyx_v_direction); /* proto */
static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_26down(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self, int __pyx_v_direction); /* proto */
static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_28go_left(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self); /* proto */
static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_30go_right(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self); /* proto */
static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_32has_left(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self); /* proto */
static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_34has_right(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self); /* proto */
static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_36succ_item(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self, PyObject *__pyx_v_key); /* proto */
static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_38prev_item(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self, PyObject *__pyx_v_key); /* proto */
static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_40floor_item(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self, PyObject *__pyx_v_key); /* proto */
static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_42ceiling_item(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self, PyObject *__pyx_v_key); /* proto */
static char __pyx_k_1[] = "pop(): stack is empty";
static char __pyx_k__key[] = "key";
static char __pyx_k__pop[] = "pop";
static char __pyx_k__item[] = "item";
static char __pyx_k__push[] = "push";
static char __pyx_k__reset[] = "reset";
static char __pyx_k__value[] = "value";
static char __pyx_k__KeyError[] = "KeyError";
static char __pyx_k____main__[] = "__main__";
static char __pyx_k____test__[] = "__test__";
static char __pyx_k__is_valid[] = "is_valid";
static char __pyx_k__property[] = "property";
static char __pyx_k__IndexError[] = "IndexError";
static PyObject *__pyx_kp_s_1;
static PyObject *__pyx_n_s__IndexError;
static PyObject *__pyx_n_s__KeyError;
static PyObject *__pyx_n_s____main__;
static PyObject *__pyx_n_s____test__;
static PyObject *__pyx_n_s__is_valid;
static PyObject *__pyx_n_s__item;
static PyObject *__pyx_n_s__key;
static PyObject *__pyx_n_s__pop;
static PyObject *__pyx_n_s__property;
static PyObject *__pyx_n_s__push;
static PyObject *__pyx_n_s__reset;
static PyObject *__pyx_n_s__value;
static PyObject *__pyx_k_tuple_2;

/* Python wrapper */
static int __pyx_pw_8bintrees_7cwalker_7cWalker_1__cinit__(PyObject *__pyx_v_self, PyObject *__pyx_args, PyObject *__pyx_kwds); /*proto*/
static int __pyx_pw_8bintrees_7cwalker_7cWalker_1__cinit__(PyObject *__pyx_v_self, PyObject *__pyx_args, PyObject *__pyx_kwds) {
  int __pyx_r;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("__cinit__ (wrapper)", 0);
  if (unlikely(PyTuple_GET_SIZE(__pyx_args) > 0)) {
    __Pyx_RaiseArgtupleInvalid("__cinit__", 1, 0, 0, PyTuple_GET_SIZE(__pyx_args)); return -1;}
  if (unlikely(__pyx_kwds) && unlikely(PyDict_Size(__pyx_kwds) > 0) && unlikely(!__Pyx_CheckKeywordStrings(__pyx_kwds, "__cinit__", 0))) return -1;
  __pyx_r = __pyx_pf_8bintrees_7cwalker_7cWalker___cinit__(((struct __pyx_obj_8bintrees_7cwalker_cWalker *)__pyx_v_self));
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* "bintrees\cwalker.pyx":15
 *
 * cdef class cWalker:
 *     def __cinit__(self):             # <<<<<<<<<<<<<<
 *         self.root = NULL
 *         self.node = NULL
 */

static int __pyx_pf_8bintrees_7cwalker_7cWalker___cinit__(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self) {
  int __pyx_r;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("__cinit__", 0);

  /* "bintrees\cwalker.pyx":16
 * cdef class cWalker:
 *     def __cinit__(self):
 *         self.root = NULL             # <<<<<<<<<<<<<<
 *         self.node = NULL
 *         self.stack = stack_init(MAXSTACK)
 */
  __pyx_v_self->root = NULL;

  /* "bintrees\cwalker.pyx":17
 *     def __cinit__(self):
 *         self.root = NULL
 *         self.node = NULL             # <<<<<<<<<<<<<<
 *         self.stack = stack_init(MAXSTACK)
 *
 */
  __pyx_v_self->node = NULL;

  /* "bintrees\cwalker.pyx":18
 *         self.root = NULL
 *         self.node = NULL
 *         self.stack = stack_init(MAXSTACK)             # <<<<<<<<<<<<<<
 *
 *     def __dealloc__(self):
 */
  __pyx_v_self->stack = stack_init(32);

  __pyx_r = 0;
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* Python wrapper */
static void __pyx_pw_8bintrees_7cwalker_7cWalker_3__dealloc__(PyObject *__pyx_v_self); /*proto*/
static void __pyx_pw_8bintrees_7cwalker_7cWalker_3__dealloc__(PyObject *__pyx_v_self) {
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("__dealloc__ (wrapper)", 0);
  __pyx_pf_8bintrees_7cwalker_7cWalker_2__dealloc__(((struct __pyx_obj_8bintrees_7cwalker_cWalker *)__pyx_v_self));
  __Pyx_RefNannyFinishContext();
}

/* "bintrees\cwalker.pyx":20
 *         self.stack = stack_init(MAXSTACK)
 *
 *     def __dealloc__(self):             # <<<<<<<<<<<<<<
 *         stack_delete(self.stack)
 *
 */

static void __pyx_pf_8bintrees_7cwalker_7cWalker_2__dealloc__(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self) {
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("__dealloc__", 0);

  /* "bintrees\cwalker.pyx":21
 *
 *     def __dealloc__(self):
 *         stack_delete(self.stack)             # <<<<<<<<<<<<<<
 *
 *     cdef void set_tree(self, node_t *root):
 */
  stack_delete(__pyx_v_self->stack);

  __Pyx_RefNannyFinishContext();
}

/* "bintrees\cwalker.pyx":23
 *         stack_delete(self.stack)
 *
 *     cdef void set_tree(self, node_t *root):             # <<<<<<<<<<<<<<
 *         self.root = root
 *         self.reset()
 */

static void __pyx_f_8bintrees_7cwalker_7cWalker_set_tree(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self, node_t *__pyx_v_root) {
  __Pyx_RefNannyDeclarations
  PyObject *__pyx_t_1 = NULL;
  int __pyx_lineno = 0;
  const char *__pyx_filename = NULL;
  int __pyx_clineno = 0;
  __Pyx_RefNannySetupContext("set_tree", 0);

  /* "bintrees\cwalker.pyx":24
 *
 *     cdef void set_tree(self, node_t *root):
 *         self.root = root             # <<<<<<<<<<<<<<
 *         self.reset()
 *
 */
  __pyx_v_self->root = __pyx_v_root;

  /* "bintrees\cwalker.pyx":25
 *     cdef void set_tree(self, node_t *root):
 *         self.root = root
 *         self.reset()             # <<<<<<<<<<<<<<
 *
 *     cpdef reset(self):
 */
  __pyx_t_1 = ((struct __pyx_vtabstruct_8bintrees_7cwalker_cWalker *)__pyx_v_self->__pyx_vtab)->reset(__pyx_v_self, 0); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 25; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_t_1);
  __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;

  goto __pyx_L0;
  __pyx_L1_error:;
  __Pyx_XDECREF(__pyx_t_1);
  __Pyx_WriteUnraisable("bintrees.cwalker.cWalker.set_tree", __pyx_clineno, __pyx_lineno, __pyx_filename);
  __pyx_L0:;
  __Pyx_RefNannyFinishContext();
}

/* "bintrees\cwalker.pyx":27
 *         self.reset()
 *
 *     cpdef reset(self):             # <<<<<<<<<<<<<<
 *         stack_reset(self.stack)
 *         self.node = self.root
 */

static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_5reset(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused); /*proto*/
static PyObject *__pyx_f_8bintrees_7cwalker_7cWalker_reset(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self, int __pyx_skip_dispatch) {
  PyObject *__pyx_r = NULL;
  __Pyx_RefNannyDeclarations
  PyObject *__pyx_t_1 = NULL;
  PyObject *__pyx_t_2 = NULL;
  node_t *__pyx_t_3;
  int __pyx_lineno = 0;
  const char *__pyx_filename = NULL;
  int __pyx_clineno = 0;
  __Pyx_RefNannySetupContext("reset", 0);
  /* Check if called by wrapper */
  if (unlikely(__pyx_skip_dispatch)) ;
  /* Check if overriden in Python */
  else if (unlikely(Py_TYPE(((PyObject *)__pyx_v_self))->tp_dictoffset != 0)) {
    __pyx_t_1 = PyObject_GetAttr(((PyObject *)__pyx_v_self), __pyx_n_s__reset); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 27; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
    __Pyx_GOTREF(__pyx_t_1);
    if (!PyCFunction_Check(__pyx_t_1) || (PyCFunction_GET_FUNCTION(__pyx_t_1) != (PyCFunction)__pyx_pw_8bintrees_7cwalker_7cWalker_5reset)) {
      __Pyx_XDECREF(__pyx_r);
      __pyx_t_2 = PyObject_Call(__pyx_t_1, ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 27; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
      __Pyx_GOTREF(__pyx_t_2);
      __pyx_r = __pyx_t_2;
      __pyx_t_2 = 0;
      __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
      goto __pyx_L0;
    }
    __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
  }

  /* "bintrees\cwalker.pyx":28
 *
 *     cpdef reset(self):
 *         stack_reset(self.stack)             # <<<<<<<<<<<<<<
 *         self.node = self.root
 *
 */
  stack_reset(__pyx_v_self->stack);

  /* "bintrees\cwalker.pyx":29
 *     cpdef reset(self):
 *         stack_reset(self.stack)
 *         self.node = self.root             # <<<<<<<<<<<<<<
 *
 *     @property
 */
  __pyx_t_3 = __pyx_v_self->root;
  __pyx_v_self->node = __pyx_t_3;

  __pyx_r = Py_None; __Pyx_INCREF(Py_None);
  goto __pyx_L0;
  __pyx_L1_error:;
  __Pyx_XDECREF(__pyx_t_1);
  __Pyx_XDECREF(__pyx_t_2);
  __Pyx_AddTraceback("bintrees.cwalker.cWalker.reset", __pyx_clineno, __pyx_lineno, __pyx_filename);
  __pyx_r = 0;
  __pyx_L0:;
  __Pyx_XGIVEREF(__pyx_r);
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* Python wrapper */
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_5reset(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused); /*proto*/
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_5reset(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused) {
  PyObject *__pyx_r = 0;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("reset (wrapper)", 0);
  __pyx_r = __pyx_pf_8bintrees_7cwalker_7cWalker_4reset(((struct __pyx_obj_8bintrees_7cwalker_cWalker *)__pyx_v_self));
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* "bintrees\cwalker.pyx":27
 *         self.reset()
 *
 *     cpdef reset(self):             # <<<<<<<<<<<<<<
 *         stack_reset(self.stack)
 *         self.node = self.root
 */

static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_4reset(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self) {
  PyObject *__pyx_r = NULL;
  __Pyx_RefNannyDeclarations
  PyObject *__pyx_t_1 = NULL;
  int __pyx_lineno = 0;
  const char *__pyx_filename = NULL;
  int __pyx_clineno = 0;
  __Pyx_RefNannySetupContext("reset", 0);
  __Pyx_XDECREF(__pyx_r);
  __pyx_t_1 = ((struct __pyx_vtabstruct_8bintrees_7cwalker_cWalker *)__pyx_v_self->__pyx_vtab)->reset(__pyx_v_self, 1); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 27; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_t_1);
  __pyx_r = __pyx_t_1;
  __pyx_t_1 = 0;
  goto __pyx_L0;

  __pyx_r = Py_None; __Pyx_INCREF(Py_None);
  goto __pyx_L0;
  __pyx_L1_error:;
  __Pyx_XDECREF(__pyx_t_1);
  __Pyx_AddTraceback("bintrees.cwalker.cWalker.reset", __pyx_clineno, __pyx_lineno, __pyx_filename);
  __pyx_r = NULL;
  __pyx_L0:;
  __Pyx_XGIVEREF(__pyx_r);
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* Python wrapper */
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_7key(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused); /*proto*/
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_7key(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused) {
  PyObject *__pyx_r = 0;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("key (wrapper)", 0);
  __pyx_r = __pyx_pf_8bintrees_7cwalker_7cWalker_6key(((struct __pyx_obj_8bintrees_7cwalker_cWalker *)__pyx_v_self));
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* "bintrees\cwalker.pyx":32
 *
 *     @property
 *     def key(self):             # <<<<<<<<<<<<<<
 *         return <object> self.node.key
 *
 */

static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_6key(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self) {
  PyObject *__pyx_r = NULL;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("key", 0);

  /* "bintrees\cwalker.pyx":33
 *     @property
 *     def key(self):
 *         return <object> self.node.key             # <<<<<<<<<<<<<<
 *
 *     @property
 */
  __Pyx_XDECREF(__pyx_r);
  __Pyx_INCREF(((PyObject *)__pyx_v_self->node->key));
  __pyx_r = ((PyObject *)__pyx_v_self->node->key);
  goto __pyx_L0;

  __pyx_r = Py_None; __Pyx_INCREF(Py_None);
  __pyx_L0:;
  __Pyx_XGIVEREF(__pyx_r);
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* Python wrapper */
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_9value(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused); /*proto*/
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_9value(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused) {
  PyObject *__pyx_r = 0;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("value (wrapper)", 0);
  __pyx_r = __pyx_pf_8bintrees_7cwalker_7cWalker_8value(((struct __pyx_obj_8bintrees_7cwalker_cWalker *)__pyx_v_self));
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* "bintrees\cwalker.pyx":36
 *
 *     @property
 *     def value(self):             # <<<<<<<<<<<<<<
 *         return <object> self.node.value
 *
 */

static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_8value(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self) {
  PyObject *__pyx_r = NULL;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("value", 0);

  /* "bintrees\cwalker.pyx":37
 *     @property
 *     def value(self):
 *         return <object> self.node.value             # <<<<<<<<<<<<<<
 *
 *     @property
 */
  __Pyx_XDECREF(__pyx_r);
  __Pyx_INCREF(((PyObject *)__pyx_v_self->node->value));
  __pyx_r = ((PyObject *)__pyx_v_self->node->value);
  goto __pyx_L0;

  __pyx_r = Py_None; __Pyx_INCREF(Py_None);
  __pyx_L0:;
  __Pyx_XGIVEREF(__pyx_r);
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* Python wrapper */
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_11item(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused); /*proto*/
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_11item(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused) {
  PyObject *__pyx_r = 0;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("item (wrapper)", 0);
  __pyx_r = __pyx_pf_8bintrees_7cwalker_7cWalker_10item(((struct __pyx_obj_8bintrees_7cwalker_cWalker *)__pyx_v_self));
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* "bintrees\cwalker.pyx":40
 *
 *     @property
 *     def item(self):             # <<<<<<<<<<<<<<
 *         return (<object>self.node.key, <object>self.node.value)
 *
 */

static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_10item(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self) {
  PyObject *__pyx_r = NULL;
  __Pyx_RefNannyDeclarations
  PyObject *__pyx_t_1 = NULL;
  int __pyx_lineno = 0;
  const char *__pyx_filename = NULL;
  int __pyx_clineno = 0;
  __Pyx_RefNannySetupContext("item", 0);

  /* "bintrees\cwalker.pyx":41
 *     @property
 *     def item(self):
 *         return (<object>self.node.key, <object>self.node.value)             # <<<<<<<<<<<<<<
 *
 *     @property
 */
  __Pyx_XDECREF(__pyx_r);
  __pyx_t_1 = PyTuple_New(2); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 41; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_t_1);
  __Pyx_INCREF(((PyObject *)__pyx_v_self->node->key));
  PyTuple_SET_ITEM(__pyx_t_1, 0, ((PyObject *)__pyx_v_self->node->key));
  __Pyx_GIVEREF(((PyObject *)__pyx_v_self->node->key));
  __Pyx_INCREF(((PyObject *)__pyx_v_self->node->value));
  PyTuple_SET_ITEM(__pyx_t_1, 1, ((PyObject *)__pyx_v_self->node->value));
  __Pyx_GIVEREF(((PyObject *)__pyx_v_self->node->value));
  __pyx_r = ((PyObject *)__pyx_t_1);
  __pyx_t_1 = 0;
  goto __pyx_L0;

  __pyx_r = Py_None; __Pyx_INCREF(Py_None);
  goto __pyx_L0;
  __pyx_L1_error:;
  __Pyx_XDECREF(__pyx_t_1);
  __Pyx_AddTraceback("bintrees.cwalker.cWalker.item", __pyx_clineno, __pyx_lineno, __pyx_filename);
  __pyx_r = NULL;
  __pyx_L0:;
  __Pyx_XGIVEREF(__pyx_r);
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* Python wrapper */
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_13is_valid(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused); /*proto*/
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_13is_valid(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused) {
  PyObject *__pyx_r = 0;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("is_valid (wrapper)", 0);
  __pyx_r = __pyx_pf_8bintrees_7cwalker_7cWalker_12is_valid(((struct __pyx_obj_8bintrees_7cwalker_cWalker *)__pyx_v_self));
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* "bintrees\cwalker.pyx":44
 *
 *     @property
 *     def is_valid(self):             # <<<<<<<<<<<<<<
 *         return self.node != NULL
 *
 */

static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_12is_valid(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self) {
  PyObject *__pyx_r = NULL;
  __Pyx_RefNannyDeclarations
  PyObject *__pyx_t_1 = NULL;
  int __pyx_lineno = 0;
  const char *__pyx_filename = NULL;
  int __pyx_clineno = 0;
  __Pyx_RefNannySetupContext("is_valid", 0);

  /* "bintrees\cwalker.pyx":45
 *     @property
 *     def is_valid(self):
 *         return self.node != NULL             # <<<<<<<<<<<<<<
 *
 *     def goto(self, key):
 */
  __Pyx_XDECREF(__pyx_r);
  __pyx_t_1 = __Pyx_PyBool_FromLong((__pyx_v_self->node != NULL)); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 45; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_t_1);
  __pyx_r = __pyx_t_1;
  __pyx_t_1 = 0;
  goto __pyx_L0;

  __pyx_r = Py_None; __Pyx_INCREF(Py_None);
  goto __pyx_L0;
  __pyx_L1_error:;
  __Pyx_XDECREF(__pyx_t_1);
  __Pyx_AddTraceback("bintrees.cwalker.cWalker.is_valid", __pyx_clineno, __pyx_lineno, __pyx_filename);
  __pyx_r = NULL;
  __pyx_L0:;
  __Pyx_XGIVEREF(__pyx_r);
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* Python wrapper */
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_15goto(PyObject *__pyx_v_self, PyObject *__pyx_v_key); /*proto*/
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_15goto(PyObject *__pyx_v_self, PyObject *__pyx_v_key) {
  PyObject *__pyx_r = 0;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("goto (wrapper)", 0);
  __pyx_r = __pyx_pf_8bintrees_7cwalker_7cWalker_14goto(((struct __pyx_obj_8bintrees_7cwalker_cWalker *)__pyx_v_self), ((PyObject *)__pyx_v_key));
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* "bintrees\cwalker.pyx":47
 *         return self.node != NULL
 *
 *     def goto(self, key):             # <<<<<<<<<<<<<<
 *         cdef int cval
 *         self.node = self.root
 */

static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_14goto(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self, PyObject *__pyx_v_key) {
  int __pyx_v_cval;
  PyObject *__pyx_r = NULL;
  __Pyx_RefNannyDeclarations
  node_t *__pyx_t_1;
  int __pyx_t_2;
  PyObject *__pyx_t_3 = NULL;
  int __pyx_lineno = 0;
  const char *__pyx_filename = NULL;
  int __pyx_clineno = 0;
  __Pyx_RefNannySetupContext("goto", 0);

  /* "bintrees\cwalker.pyx":49
 *     def goto(self, key):
 *         cdef int cval
 *         self.node = self.root             # <<<<<<<<<<<<<<
 *         while self.node != NULL:
 *             cval = ct_compare(key, <object> self.node.key)
 */
  __pyx_t_1 = __pyx_v_self->root;
  __pyx_v_self->node = __pyx_t_1;

  /* "bintrees\cwalker.pyx":50
 *         cdef int cval
 *         self.node = self.root
 *         while self.node != NULL:             # <<<<<<<<<<<<<<
 *             cval = ct_compare(key, <object> self.node.key)
 *             if cval == 0:
 */
  while (1) {
    __pyx_t_2 = (__pyx_v_self->node != NULL);
    if (!__pyx_t_2) break;

    /* "bintrees\cwalker.pyx":51
 *         self.node = self.root
 *         while self.node != NULL:
 *             cval = ct_compare(key, <object> self.node.key)             # <<<<<<<<<<<<<<
 *             if cval == 0:
 *                 return True
 */
    __pyx_t_3 = ((PyObject *)__pyx_v_self->node->key);
    __Pyx_INCREF(__pyx_t_3);
    __pyx_v_cval = ct_compare(__pyx_v_key, __pyx_t_3);
    __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;

    /* "bintrees\cwalker.pyx":52
 *         while self.node != NULL:
 *             cval = ct_compare(key, <object> self.node.key)
 *             if cval == 0:             # <<<<<<<<<<<<<<
 *                 return True
 *             elif cval < 0:
 */
    __pyx_t_2 = (__pyx_v_cval == 0);
    if (__pyx_t_2) {

      /* "bintrees\cwalker.pyx":53
 *             cval = ct_compare(key, <object> self.node.key)
 *             if cval == 0:
 *                 return True             # <<<<<<<<<<<<<<
 *             elif cval < 0:
 *                 self.node = self.node.link[0]
 */
      __Pyx_XDECREF(__pyx_r);
      __pyx_t_3 = __Pyx_PyBool_FromLong(1); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 53; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
      __Pyx_GOTREF(__pyx_t_3);
      __pyx_r = __pyx_t_3;
      __pyx_t_3 = 0;
      goto __pyx_L0;
      goto __pyx_L5;
    }

    /* "bintrees\cwalker.pyx":54
 *             if cval == 0:
 *                 return True
 *             elif cval < 0:             # <<<<<<<<<<<<<<
 *                 self.node = self.node.link[0]
 *             else:
 */
    __pyx_t_2 = (__pyx_v_cval < 0);
    if (__pyx_t_2) {

      /* "bintrees\cwalker.pyx":55
 *                 return True
 *             elif cval < 0:
 *                 self.node = self.node.link[0]             # <<<<<<<<<<<<<<
 *             else:
 *                 self.node = self.node.link[1]
 */
      __pyx_v_self->node = (__pyx_v_self->node->link[0]);
      goto __pyx_L5;
    }
    /*else*/ {

      /* "bintrees\cwalker.pyx":57
 *                 self.node = self.node.link[0]
 *             else:
 *                 self.node = self.node.link[1]             # <<<<<<<<<<<<<<
 *         return False
 *
 */
      __pyx_v_self->node = (__pyx_v_self->node->link[1]);
    }
    __pyx_L5:;
  }

  /* "bintrees\cwalker.pyx":58
 *             else:
 *                 self.node = self.node.link[1]
 *         return False             # <<<<<<<<<<<<<<
 *
 *     cpdef push(self):
 */
  __Pyx_XDECREF(__pyx_r);
  __pyx_t_3 = __Pyx_PyBool_FromLong(0); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 58; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_t_3);
  __pyx_r = __pyx_t_3;
  __pyx_t_3 = 0;
  goto __pyx_L0;

  __pyx_r = Py_None; __Pyx_INCREF(Py_None);
  goto __pyx_L0;
  __pyx_L1_error:;
  __Pyx_XDECREF(__pyx_t_3);
  __Pyx_AddTraceback("bintrees.cwalker.cWalker.goto", __pyx_clineno, __pyx_lineno, __pyx_filename);
  __pyx_r = NULL;
  __pyx_L0:;
  __Pyx_XGIVEREF(__pyx_r);
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* "bintrees\cwalker.pyx":60
 *         return False
 *
 *     cpdef push(self):             # <<<<<<<<<<<<<<
 *         stack_push(self.stack, self.node)
 *
 */

static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_17push(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused); /*proto*/
static PyObject *__pyx_f_8bintrees_7cwalker_7cWalker_push(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self, int __pyx_skip_dispatch) {
  PyObject *__pyx_r = NULL;
  __Pyx_RefNannyDeclarations
  PyObject *__pyx_t_1 = NULL;
  PyObject *__pyx_t_2 = NULL;
  int __pyx_lineno = 0;
  const char *__pyx_filename = NULL;
  int __pyx_clineno = 0;
  __Pyx_RefNannySetupContext("push", 0);
  /* Check if called by wrapper */
  if (unlikely(__pyx_skip_dispatch)) ;
  /* Check if overriden in Python */
  else if (unlikely(Py_TYPE(((PyObject *)__pyx_v_self))->tp_dictoffset != 0)) {
    __pyx_t_1 = PyObject_GetAttr(((PyObject *)__pyx_v_self), __pyx_n_s__push); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 60; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
    __Pyx_GOTREF(__pyx_t_1);
    if (!PyCFunction_Check(__pyx_t_1) || (PyCFunction_GET_FUNCTION(__pyx_t_1) != (PyCFunction)__pyx_pw_8bintrees_7cwalker_7cWalker_17push)) {
      __Pyx_XDECREF(__pyx_r);
      __pyx_t_2 = PyObject_Call(__pyx_t_1, ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 60; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
      __Pyx_GOTREF(__pyx_t_2);
      __pyx_r = __pyx_t_2;
      __pyx_t_2 = 0;
      __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
      goto __pyx_L0;
    }
    __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
  }

  /* "bintrees\cwalker.pyx":61
 *
 *     cpdef push(self):
 *         stack_push(self.stack, self.node)             # <<<<<<<<<<<<<<
 *
 *     cpdef pop(self):
 */
  stack_push(__pyx_v_self->stack, __pyx_v_self->node);

  __pyx_r = Py_None; __Pyx_INCREF(Py_None);
  goto __pyx_L0;
  __pyx_L1_error:;
  __Pyx_XDECREF(__pyx_t_1);
  __Pyx_XDECREF(__pyx_t_2);
  __Pyx_AddTraceback("bintrees.cwalker.cWalker.push", __pyx_clineno, __pyx_lineno, __pyx_filename);
  __pyx_r = 0;
  __pyx_L0:;
  __Pyx_XGIVEREF(__pyx_r);
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* Python wrapper */
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_17push(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused); /*proto*/
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_17push(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused) {
  PyObject *__pyx_r = 0;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("push (wrapper)", 0);
  __pyx_r = __pyx_pf_8bintrees_7cwalker_7cWalker_16push(((struct __pyx_obj_8bintrees_7cwalker_cWalker *)__pyx_v_self));
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* "bintrees\cwalker.pyx":60
 *         return False
 *
 *     cpdef push(self):             # <<<<<<<<<<<<<<
 *         stack_push(self.stack, self.node)
 *
 */

static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_16push(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self) {
  PyObject *__pyx_r = NULL;
  __Pyx_RefNannyDeclarations
  PyObject *__pyx_t_1 = NULL;
  int __pyx_lineno = 0;
  const char *__pyx_filename = NULL;
  int __pyx_clineno = 0;
  __Pyx_RefNannySetupContext("push", 0);
  __Pyx_XDECREF(__pyx_r);
  __pyx_t_1 = ((struct __pyx_vtabstruct_8bintrees_7cwalker_cWalker *)__pyx_v_self->__pyx_vtab)->push(__pyx_v_self, 1); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 60; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_t_1);
  __pyx_r = __pyx_t_1;
  __pyx_t_1 = 0;
  goto __pyx_L0;

  __pyx_r = Py_None; __Pyx_INCREF(Py_None);
  goto __pyx_L0;
  __pyx_L1_error:;
  __Pyx_XDECREF(__pyx_t_1);
  __Pyx_AddTraceback("bintrees.cwalker.cWalker.push", __pyx_clineno, __pyx_lineno, __pyx_filename);
  __pyx_r = NULL;
  __pyx_L0:;
  __Pyx_XGIVEREF(__pyx_r);
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* "bintrees\cwalker.pyx":63
 *         stack_push(self.stack, self.node)
 *
 *     cpdef pop(self):             # <<<<<<<<<<<<<<
 *         if stack_is_empty(self.stack) != 0:
 *             raise IndexError('pop(): stack is empty')
 */

static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_19pop(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused); /*proto*/
static PyObject *__pyx_f_8bintrees_7cwalker_7cWalker_pop(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self, int __pyx_skip_dispatch) {
  PyObject *__pyx_r = NULL;
  __Pyx_RefNannyDeclarations
  PyObject *__pyx_t_1 = NULL;
  PyObject *__pyx_t_2 = NULL;
  int __pyx_t_3;
  int __pyx_lineno = 0;
  const char *__pyx_filename = NULL;
  int __pyx_clineno = 0;
  __Pyx_RefNannySetupContext("pop", 0);
  /* Check if called by wrapper */
  if (unlikely(__pyx_skip_dispatch)) ;
  /* Check if overriden in Python */
  else if (unlikely(Py_TYPE(((PyObject *)__pyx_v_self))->tp_dictoffset != 0)) {
    __pyx_t_1 = PyObject_GetAttr(((PyObject *)__pyx_v_self), __pyx_n_s__pop); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 63; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
    __Pyx_GOTREF(__pyx_t_1);
    if (!PyCFunction_Check(__pyx_t_1) || (PyCFunction_GET_FUNCTION(__pyx_t_1) != (PyCFunction)__pyx_pw_8bintrees_7cwalker_7cWalker_19pop)) {
      __Pyx_XDECREF(__pyx_r);
      __pyx_t_2 = PyObject_Call(__pyx_t_1, ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 63; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
      __Pyx_GOTREF(__pyx_t_2);
      __pyx_r = __pyx_t_2;
      __pyx_t_2 = 0;
      __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
      goto __pyx_L0;
    }
    __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
  }

  /* "bintrees\cwalker.pyx":64
 *
 *     cpdef pop(self):
 *         if stack_is_empty(self.stack) != 0:             # <<<<<<<<<<<<<<
 *             raise IndexError('pop(): stack is empty')
 *         self.node = stack_pop(self.stack)
 */
  __pyx_t_3 = (stack_is_empty(__pyx_v_self->stack) != 0);
  if (__pyx_t_3) {

    /* "bintrees\cwalker.pyx":65
 *     cpdef pop(self):
 *         if stack_is_empty(self.stack) != 0:
 *             raise IndexError('pop(): stack is empty')             # <<<<<<<<<<<<<<
 *         self.node = stack_pop(self.stack)
 *
 */
    __pyx_t_1 = PyObject_Call(__pyx_builtin_IndexError, ((PyObject *)__pyx_k_tuple_2), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 65; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
    __Pyx_GOTREF(__pyx_t_1);
    __Pyx_Raise(__pyx_t_1, 0, 0, 0);
    __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
    {__pyx_filename = __pyx_f[0]; __pyx_lineno = 65; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
    goto __pyx_L3;
  }
  __pyx_L3:;

  /* "bintrees\cwalker.pyx":66
 *         if stack_is_empty(self.stack) != 0:
 *             raise IndexError('pop(): stack is empty')
 *         self.node = stack_pop(self.stack)             # <<<<<<<<<<<<<<
 *
 *     def stack_is_empty(self):
 */
  __pyx_v_self->node = stack_pop(__pyx_v_self->stack);

  __pyx_r = Py_None; __Pyx_INCREF(Py_None);
  goto __pyx_L0;
  __pyx_L1_error:;
  __Pyx_XDECREF(__pyx_t_1);
  __Pyx_XDECREF(__pyx_t_2);
  __Pyx_AddTraceback("bintrees.cwalker.cWalker.pop", __pyx_clineno, __pyx_lineno, __pyx_filename);
  __pyx_r = 0;
  __pyx_L0:;
  __Pyx_XGIVEREF(__pyx_r);
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* Python wrapper */
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_19pop(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused); /*proto*/
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_19pop(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused) {
  PyObject *__pyx_r = 0;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("pop (wrapper)", 0);
  __pyx_r = __pyx_pf_8bintrees_7cwalker_7cWalker_18pop(((struct __pyx_obj_8bintrees_7cwalker_cWalker *)__pyx_v_self));
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* "bintrees\cwalker.pyx":63
 *         stack_push(self.stack, self.node)
 *
 *     cpdef pop(self):             # <<<<<<<<<<<<<<
 *         if stack_is_empty(self.stack) != 0:
 *             raise IndexError('pop(): stack is empty')
 */

static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_18pop(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self) {
  PyObject *__pyx_r = NULL;
  __Pyx_RefNannyDeclarations
  PyObject *__pyx_t_1 = NULL;
  int __pyx_lineno = 0;
  const char *__pyx_filename = NULL;
  int __pyx_clineno = 0;
  __Pyx_RefNannySetupContext("pop", 0);
  __Pyx_XDECREF(__pyx_r);
  __pyx_t_1 = ((struct __pyx_vtabstruct_8bintrees_7cwalker_cWalker *)__pyx_v_self->__pyx_vtab)->pop(__pyx_v_self, 1); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 63; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_t_1);
  __pyx_r = __pyx_t_1;
  __pyx_t_1 = 0;
  goto __pyx_L0;

  __pyx_r = Py_None; __Pyx_INCREF(Py_None);
  goto __pyx_L0;
  __pyx_L1_error:;
  __Pyx_XDECREF(__pyx_t_1);
  __Pyx_AddTraceback("bintrees.cwalker.cWalker.pop", __pyx_clineno, __pyx_lineno, __pyx_filename);
  __pyx_r = NULL;
  __pyx_L0:;
  __Pyx_XGIVEREF(__pyx_r);
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* Python wrapper */
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_21stack_is_empty(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused); /*proto*/
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_21stack_is_empty(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused) {
  PyObject *__pyx_r = 0;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("stack_is_empty (wrapper)", 0);
  __pyx_r = __pyx_pf_8bintrees_7cwalker_7cWalker_20stack_is_empty(((struct __pyx_obj_8bintrees_7cwalker_cWalker *)__pyx_v_self));
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* "bintrees\cwalker.pyx":68
 *         self.node = stack_pop(self.stack)
 *
 *     def stack_is_empty(self):             # <<<<<<<<<<<<<<
 *         return <bint> stack_is_empty(self.stack)
 *
 */

static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_20stack_is_empty(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self) {
  PyObject *__pyx_r = NULL;
  __Pyx_RefNannyDeclarations
  PyObject *__pyx_t_1 = NULL;
  int __pyx_lineno = 0;
  const char *__pyx_filename = NULL;
  int __pyx_clineno = 0;
  __Pyx_RefNannySetupContext("stack_is_empty", 0);

  /* "bintrees\cwalker.pyx":69
 *
 *     def stack_is_empty(self):
 *         return <bint> stack_is_empty(self.stack)             # <<<<<<<<<<<<<<
 *
 *     def goto_leaf(self):
 */
  __Pyx_XDECREF(__pyx_r);
  __pyx_t_1 = __Pyx_PyBool_FromLong(((int)stack_is_empty(__pyx_v_self->stack))); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 69; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_t_1);
  __pyx_r = __pyx_t_1;
  __pyx_t_1 = 0;
  goto __pyx_L0;

  __pyx_r = Py_None; __Pyx_INCREF(Py_None);
  goto __pyx_L0;
  __pyx_L1_error:;
  __Pyx_XDECREF(__pyx_t_1);
  __Pyx_AddTraceback("bintrees.cwalker.cWalker.stack_is_empty", __pyx_clineno, __pyx_lineno, __pyx_filename);
  __pyx_r = NULL;
  __pyx_L0:;
  __Pyx_XGIVEREF(__pyx_r);
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* Python wrapper */
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_23goto_leaf(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused); /*proto*/
static char __pyx_doc_8bintrees_7cwalker_7cWalker_22goto_leaf[] = " get a leaf node ";
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_23goto_leaf(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused) {
  PyObject *__pyx_r = 0;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("goto_leaf (wrapper)", 0);
  __pyx_r = __pyx_pf_8bintrees_7cwalker_7cWalker_22goto_leaf(((struct __pyx_obj_8bintrees_7cwalker_cWalker *)__pyx_v_self));
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* "bintrees\cwalker.pyx":71
 *         return <bint> stack_is_empty(self.stack)
 *
 *     def goto_leaf(self):             # <<<<<<<<<<<<<<
 *         """ get a leaf node """
 *         while self.node != NULL:
 */

static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_22goto_leaf(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self) {
  PyObject *__pyx_r = NULL;
  __Pyx_RefNannyDeclarations
  int __pyx_t_1;
  __Pyx_RefNannySetupContext("goto_leaf", 0);

  /* "bintrees\cwalker.pyx":73
 *     def goto_leaf(self):
 *         """ get a leaf node """
 *         while self.node != NULL:             # <<<<<<<<<<<<<<
 *             if self.node.link[0] != NULL:
 *                 self.node = self.node.link[0]
 */
  while (1) {
    __pyx_t_1 = (__pyx_v_self->node != NULL);
    if (!__pyx_t_1) break;

    /* "bintrees\cwalker.pyx":74
 *         """ get a leaf node """
 *         while self.node != NULL:
 *             if self.node.link[0] != NULL:             # <<<<<<<<<<<<<<
 *                 self.node = self.node.link[0]
 *             elif self.node.link[1] != NULL:
 */
    __pyx_t_1 = ((__pyx_v_self->node->link[0]) != NULL);
    if (__pyx_t_1) {

      /* "bintrees\cwalker.pyx":75
 *         while self.node != NULL:
 *             if self.node.link[0] != NULL:
 *                 self.node = self.node.link[0]             # <<<<<<<<<<<<<<
 *             elif self.node.link[1] != NULL:
 *                 self.node = self.node.link[1]
 */
      __pyx_v_self->node = (__pyx_v_self->node->link[0]);
      goto __pyx_L5;
    }

    /* "bintrees\cwalker.pyx":76
 *             if self.node.link[0] != NULL:
 *                 self.node = self.node.link[0]
 *             elif self.node.link[1] != NULL:             # <<<<<<<<<<<<<<
 *                 self.node = self.node.link[1]
 *             else:
 */
    __pyx_t_1 = ((__pyx_v_self->node->link[1]) != NULL);
    if (__pyx_t_1) {

      /* "bintrees\cwalker.pyx":77
 *                 self.node = self.node.link[0]
 *             elif self.node.link[1] != NULL:
 *                 self.node = self.node.link[1]             # <<<<<<<<<<<<<<
 *             else:
 *                 return
 */
      __pyx_v_self->node = (__pyx_v_self->node->link[1]);
      goto __pyx_L5;
    }
    /*else*/ {

      /* "bintrees\cwalker.pyx":79
 *                 self.node = self.node.link[1]
 *             else:
 *                 return             # <<<<<<<<<<<<<<
 *
 *     def has_child(self, int direction):
 */
      __Pyx_XDECREF(__pyx_r);
      __pyx_r = Py_None; __Pyx_INCREF(Py_None);
      goto __pyx_L0;
    }
    __pyx_L5:;
  }

  __pyx_r = Py_None; __Pyx_INCREF(Py_None);
  __pyx_L0:;
  __Pyx_XGIVEREF(__pyx_r);
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* Python wrapper */
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_25has_child(PyObject *__pyx_v_self, PyObject *__pyx_arg_direction); /*proto*/
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_25has_child(PyObject *__pyx_v_self, PyObject *__pyx_arg_direction) {
  int __pyx_v_direction;
  PyObject *__pyx_r = 0;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("has_child (wrapper)", 0);
  assert(__pyx_arg_direction); {
    __pyx_v_direction = __Pyx_PyInt_AsInt(__pyx_arg_direction); if (unlikely((__pyx_v_direction == (int)-1) && PyErr_Occurred())) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 81; __pyx_clineno = __LINE__; goto __pyx_L3_error;}
  }
  goto __pyx_L4_argument_unpacking_done;
  __pyx_L3_error:;
  __Pyx_AddTraceback("bintrees.cwalker.cWalker.has_child", __pyx_clineno, __pyx_lineno, __pyx_filename);
  __Pyx_RefNannyFinishContext();
  return NULL;
  __pyx_L4_argument_unpacking_done:;
  __pyx_r = __pyx_pf_8bintrees_7cwalker_7cWalker_24has_child(((struct __pyx_obj_8bintrees_7cwalker_cWalker *)__pyx_v_self), ((int)__pyx_v_direction));
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* "bintrees\cwalker.pyx":81
 *                 return
 *
 *     def has_child(self, int direction):             # <<<<<<<<<<<<<<
 *         return self.node.link[direction] != NULL
 *
 */

static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_24has_child(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self, int __pyx_v_direction) {
  PyObject *__pyx_r = NULL;
  __Pyx_RefNannyDeclarations
  PyObject *__pyx_t_1 = NULL;
  int __pyx_lineno = 0;
  const char *__pyx_filename = NULL;
  int __pyx_clineno = 0;
  __Pyx_RefNannySetupContext("has_child", 0);

  /* "bintrees\cwalker.pyx":82
 *
 *     def has_child(self, int direction):
 *         return self.node.link[direction] != NULL             # <<<<<<<<<<<<<<
 *
 *     def down(self, int direction):
 */
  __Pyx_XDECREF(__pyx_r);
  __pyx_t_1 = __Pyx_PyBool_FromLong(((__pyx_v_self->node->link[__pyx_v_direction]) != NULL)); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 82; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_t_1);
  __pyx_r = __pyx_t_1;
  __pyx_t_1 = 0;
  goto __pyx_L0;

  __pyx_r = Py_None; __Pyx_INCREF(Py_None);
  goto __pyx_L0;
  __pyx_L1_error:;
  __Pyx_XDECREF(__pyx_t_1);
  __Pyx_AddTraceback("bintrees.cwalker.cWalker.has_child", __pyx_clineno, __pyx_lineno, __pyx_filename);
  __pyx_r = NULL;
  __pyx_L0:;
  __Pyx_XGIVEREF(__pyx_r);
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* Python wrapper */
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_27down(PyObject *__pyx_v_self, PyObject *__pyx_arg_direction); /*proto*/
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_27down(PyObject *__pyx_v_self, PyObject *__pyx_arg_direction) {
  int __pyx_v_direction;
  PyObject *__pyx_r = 0;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("down (wrapper)", 0);
  assert(__pyx_arg_direction); {
    __pyx_v_direction = __Pyx_PyInt_AsInt(__pyx_arg_direction); if (unlikely((__pyx_v_direction == (int)-1) && PyErr_Occurred())) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 84; __pyx_clineno = __LINE__; goto __pyx_L3_error;}
  }
  goto __pyx_L4_argument_unpacking_done;
  __pyx_L3_error:;
  __Pyx_AddTraceback("bintrees.cwalker.cWalker.down", __pyx_clineno, __pyx_lineno, __pyx_filename);
  __Pyx_RefNannyFinishContext();
  return NULL;
  __pyx_L4_argument_unpacking_done:;
  __pyx_r = __pyx_pf_8bintrees_7cwalker_7cWalker_26down(((struct __pyx_obj_8bintrees_7cwalker_cWalker *)__pyx_v_self), ((int)__pyx_v_direction));
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* "bintrees\cwalker.pyx":84
 *         return self.node.link[direction] != NULL
 *
 *     def down(self, int direction):             # <<<<<<<<<<<<<<
 *         self.node = self.node.link[direction]
 *
 */

static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_26down(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self, int __pyx_v_direction) {
  PyObject *__pyx_r = NULL;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("down", 0);

  /* "bintrees\cwalker.pyx":85
 *
 *     def down(self, int direction):
 *         self.node = self.node.link[direction]             # <<<<<<<<<<<<<<
 *
 *     def go_left(self):
 */
  __pyx_v_self->node = (__pyx_v_self->node->link[__pyx_v_direction]);

  __pyx_r = Py_None; __Pyx_INCREF(Py_None);
  __Pyx_XGIVEREF(__pyx_r);
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* Python wrapper */
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_29go_left(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused); /*proto*/
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_29go_left(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused) {
  PyObject *__pyx_r = 0;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("go_left (wrapper)", 0);
  __pyx_r = __pyx_pf_8bintrees_7cwalker_7cWalker_28go_left(((struct __pyx_obj_8bintrees_7cwalker_cWalker *)__pyx_v_self));
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* "bintrees\cwalker.pyx":87
 *         self.node = self.node.link[direction]
 *
 *     def go_left(self):             # <<<<<<<<<<<<<<
 *         self.node = self.node.link[0]
 *
 */

static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_28go_left(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self) {
  PyObject *__pyx_r = NULL;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("go_left", 0);

  /* "bintrees\cwalker.pyx":88
 *
 *     def go_left(self):
 *         self.node = self.node.link[0]             # <<<<<<<<<<<<<<
 *
 *     def go_right(self):
 */
  __pyx_v_self->node = (__pyx_v_self->node->link[0]);

  __pyx_r = Py_None; __Pyx_INCREF(Py_None);
  __Pyx_XGIVEREF(__pyx_r);
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* Python wrapper */
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_31go_right(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused); /*proto*/
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_31go_right(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused) {
  PyObject *__pyx_r = 0;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("go_right (wrapper)", 0);
  __pyx_r = __pyx_pf_8bintrees_7cwalker_7cWalker_30go_right(((struct __pyx_obj_8bintrees_7cwalker_cWalker *)__pyx_v_self));
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* "bintrees\cwalker.pyx":90
 *         self.node = self.node.link[0]
 *
 *     def go_right(self):             # <<<<<<<<<<<<<<
 *         self.node = self.node.link[1]
 *
 */

static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_30go_right(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self) {
  PyObject *__pyx_r = NULL;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("go_right", 0);

  /* "bintrees\cwalker.pyx":91
 *
 *     def go_right(self):
 *         self.node = self.node.link[1]             # <<<<<<<<<<<<<<
 *
 *     def has_left(self):
 */
  __pyx_v_self->node = (__pyx_v_self->node->link[1]);

  __pyx_r = Py_None; __Pyx_INCREF(Py_None);
  __Pyx_XGIVEREF(__pyx_r);
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* Python wrapper */
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_33has_left(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused); /*proto*/
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_33has_left(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused) {
  PyObject *__pyx_r = 0;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("has_left (wrapper)", 0);
  __pyx_r = __pyx_pf_8bintrees_7cwalker_7cWalker_32has_left(((struct __pyx_obj_8bintrees_7cwalker_cWalker *)__pyx_v_self));
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* "bintrees\cwalker.pyx":93
 *         self.node = self.node.link[1]
 *
 *     def has_left(self):             # <<<<<<<<<<<<<<
 *         return self.node.link[0] != NULL
 *
 */

static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_32has_left(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self) {
  PyObject *__pyx_r = NULL;
  __Pyx_RefNannyDeclarations
  PyObject *__pyx_t_1 = NULL;
  int __pyx_lineno = 0;
  const char *__pyx_filename = NULL;
  int __pyx_clineno = 0;
  __Pyx_RefNannySetupContext("has_left", 0);

  /* "bintrees\cwalker.pyx":94
 *
 *     def has_left(self):
 *         return self.node.link[0] != NULL             # <<<<<<<<<<<<<<
 *
 *     def has_right(self):
 */
  __Pyx_XDECREF(__pyx_r);
  __pyx_t_1 = __Pyx_PyBool_FromLong(((__pyx_v_self->node->link[0]) != NULL)); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 94; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_t_1);
  __pyx_r = __pyx_t_1;
  __pyx_t_1 = 0;
  goto __pyx_L0;

  __pyx_r = Py_None; __Pyx_INCREF(Py_None);
  goto __pyx_L0;
  __pyx_L1_error:;
  __Pyx_XDECREF(__pyx_t_1);
  __Pyx_AddTraceback("bintrees.cwalker.cWalker.has_left", __pyx_clineno, __pyx_lineno, __pyx_filename);
  __pyx_r = NULL;
  __pyx_L0:;
  __Pyx_XGIVEREF(__pyx_r);
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* Python wrapper */
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_35has_right(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused); /*proto*/
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_35has_right(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused) {
  PyObject *__pyx_r = 0;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("has_right (wrapper)", 0);
  __pyx_r = __pyx_pf_8bintrees_7cwalker_7cWalker_34has_right(((struct __pyx_obj_8bintrees_7cwalker_cWalker *)__pyx_v_self));
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* "bintrees\cwalker.pyx":96
 *         return self.node.link[0] != NULL
 *
 *     def has_right(self):             # <<<<<<<<<<<<<<
 *         return self.node.link[1] != NULL
 *
 */

static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_34has_right(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self) {
  PyObject *__pyx_r = NULL;
  __Pyx_RefNannyDeclarations
  PyObject *__pyx_t_1 = NULL;
  int __pyx_lineno = 0;
  const char *__pyx_filename = NULL;
  int __pyx_clineno = 0;
  __Pyx_RefNannySetupContext("has_right", 0);

  /* "bintrees\cwalker.pyx":97
 *
 *     def has_right(self):
 *         return self.node.link[1] != NULL             # <<<<<<<<<<<<<<
 *
 *     def succ_item(self, key):
 */
  __Pyx_XDECREF(__pyx_r);
  __pyx_t_1 = __Pyx_PyBool_FromLong(((__pyx_v_self->node->link[1]) != NULL)); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 97; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_t_1);
  __pyx_r = __pyx_t_1;
  __pyx_t_1 = 0;
  goto __pyx_L0;

  __pyx_r = Py_None; __Pyx_INCREF(Py_None);
  goto __pyx_L0;
  __pyx_L1_error:;
  __Pyx_XDECREF(__pyx_t_1);
  __Pyx_AddTraceback("bintrees.cwalker.cWalker.has_right", __pyx_clineno, __pyx_lineno, __pyx_filename);
  __pyx_r = NULL;
  __pyx_L0:;
  __Pyx_XGIVEREF(__pyx_r);
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* Python wrapper */
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_37succ_item(PyObject *__pyx_v_self, PyObject *__pyx_v_key); /*proto*/
static char __pyx_doc_8bintrees_7cwalker_7cWalker_36succ_item[] = " Get successor (k,v) pair of key, raises KeyError if key is max key\n        or key does not exist.\n        ";
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_37succ_item(PyObject *__pyx_v_self, PyObject *__pyx_v_key) {
  PyObject *__pyx_r = 0;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("succ_item (wrapper)", 0);
  __pyx_r = __pyx_pf_8bintrees_7cwalker_7cWalker_36succ_item(((struct __pyx_obj_8bintrees_7cwalker_cWalker *)__pyx_v_self), ((PyObject *)__pyx_v_key));
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* "bintrees\cwalker.pyx":99
 *         return self.node.link[1] != NULL
 *
 *     def succ_item(self, key):             # <<<<<<<<<<<<<<
 *         """ Get successor (k,v) pair of key, raises KeyError if key is max key
 *         or key does not exist.
 */

static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_36succ_item(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self, PyObject *__pyx_v_key) {
  PyObject *__pyx_r = NULL;
  __Pyx_RefNannyDeclarations
  int __pyx_t_1;
  PyObject *__pyx_t_2 = NULL;
  PyObject *__pyx_t_3 = NULL;
  int __pyx_lineno = 0;
  const char *__pyx_filename = NULL;
  int __pyx_clineno = 0;
  __Pyx_RefNannySetupContext("succ_item", 0);

  /* "bintrees\cwalker.pyx":103
 *         or key does not exist.
 *         """
 *         self.node = ct_succ_node(self.root, key)             # <<<<<<<<<<<<<<
 *         if self.node == NULL: # given key is biggest in tree
 *             raise KeyError(str(key))
 */
  __pyx_v_self->node = ct_succ_node(__pyx_v_self->root, __pyx_v_key);

  /* "bintrees\cwalker.pyx":104
 *         """
 *         self.node = ct_succ_node(self.root, key)
 *         if self.node == NULL: # given key is biggest in tree             # <<<<<<<<<<<<<<
 *             raise KeyError(str(key))
 *         return (<object> self.node.key, <object> self.node.value)
 */
  __pyx_t_1 = (__pyx_v_self->node == NULL);
  if (__pyx_t_1) {

    /* "bintrees\cwalker.pyx":105
 *         self.node = ct_succ_node(self.root, key)
 *         if self.node == NULL: # given key is biggest in tree
 *             raise KeyError(str(key))             # <<<<<<<<<<<<<<
 *         return (<object> self.node.key, <object> self.node.value)
 *
 */
    __pyx_t_2 = PyTuple_New(1); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 105; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
    __Pyx_GOTREF(__pyx_t_2);
    __Pyx_INCREF(__pyx_v_key);
    PyTuple_SET_ITEM(__pyx_t_2, 0, __pyx_v_key);
    __Pyx_GIVEREF(__pyx_v_key);
    __pyx_t_3 = PyObject_Call(((PyObject *)((PyObject*)(&PyString_Type))), ((PyObject *)__pyx_t_2), NULL); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 105; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
    __Pyx_GOTREF(__pyx_t_3);
    __Pyx_DECREF(((PyObject *)__pyx_t_2)); __pyx_t_2 = 0;
    __pyx_t_2 = PyTuple_New(1); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 105; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
    __Pyx_GOTREF(__pyx_t_2);
    PyTuple_SET_ITEM(__pyx_t_2, 0, __pyx_t_3);
    __Pyx_GIVEREF(__pyx_t_3);
    __pyx_t_3 = 0;
    __pyx_t_3 = PyObject_Call(__pyx_builtin_KeyError, ((PyObject *)__pyx_t_2), NULL); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 105; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
    __Pyx_GOTREF(__pyx_t_3);
    __Pyx_DECREF(((PyObject *)__pyx_t_2)); __pyx_t_2 = 0;
    __Pyx_Raise(__pyx_t_3, 0, 0, 0);
    __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
    {__pyx_filename = __pyx_f[0]; __pyx_lineno = 105; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
    goto __pyx_L3;
  }
  __pyx_L3:;

  /* "bintrees\cwalker.pyx":106
 *         if self.node == NULL: # given key is biggest in tree
 *             raise KeyError(str(key))
 *         return (<object> self.node.key, <object> self.node.value)             # <<<<<<<<<<<<<<
 *
 *     def prev_item(self, key):
 */
  __Pyx_XDECREF(__pyx_r);
  __pyx_t_3 = PyTuple_New(2); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 106; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_t_3);
  __Pyx_INCREF(((PyObject *)__pyx_v_self->node->key));
  PyTuple_SET_ITEM(__pyx_t_3, 0, ((PyObject *)__pyx_v_self->node->key));
  __Pyx_GIVEREF(((PyObject *)__pyx_v_self->node->key));
  __Pyx_INCREF(((PyObject *)__pyx_v_self->node->value));
  PyTuple_SET_ITEM(__pyx_t_3, 1, ((PyObject *)__pyx_v_self->node->value));
  __Pyx_GIVEREF(((PyObject *)__pyx_v_self->node->value));
  __pyx_r = ((PyObject *)__pyx_t_3);
  __pyx_t_3 = 0;
  goto __pyx_L0;

  __pyx_r = Py_None; __Pyx_INCREF(Py_None);
  goto __pyx_L0;
  __pyx_L1_error:;
  __Pyx_XDECREF(__pyx_t_2);
  __Pyx_XDECREF(__pyx_t_3);
  __Pyx_AddTraceback("bintrees.cwalker.cWalker.succ_item", __pyx_clineno, __pyx_lineno, __pyx_filename);
  __pyx_r = NULL;
  __pyx_L0:;
  __Pyx_XGIVEREF(__pyx_r);
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* Python wrapper */
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_39prev_item(PyObject *__pyx_v_self, PyObject *__pyx_v_key); /*proto*/
static char __pyx_doc_8bintrees_7cwalker_7cWalker_38prev_item[] = " Get predecessor (k,v) pair of key, raises KeyError if key is min key\n        or key does not exist.\n        ";
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_39prev_item(PyObject *__pyx_v_self, PyObject *__pyx_v_key) {
  PyObject *__pyx_r = 0;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("prev_item (wrapper)", 0);
  __pyx_r = __pyx_pf_8bintrees_7cwalker_7cWalker_38prev_item(((struct __pyx_obj_8bintrees_7cwalker_cWalker *)__pyx_v_self), ((PyObject *)__pyx_v_key));
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* "bintrees\cwalker.pyx":108
 *         return (<object> self.node.key, <object> self.node.value)
 *
 *     def prev_item(self, key):             # <<<<<<<<<<<<<<
 *         """ Get predecessor (k,v) pair of key, raises KeyError if key is min key
 *         or key does not exist.
 */

static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_38prev_item(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self, PyObject *__pyx_v_key) {
  PyObject *__pyx_r = NULL;
  __Pyx_RefNannyDeclarations
  int __pyx_t_1;
  PyObject *__pyx_t_2 = NULL;
  PyObject *__pyx_t_3 = NULL;
  int __pyx_lineno = 0;
  const char *__pyx_filename = NULL;
  int __pyx_clineno = 0;
  __Pyx_RefNannySetupContext("prev_item", 0);

  /* "bintrees\cwalker.pyx":112
 *         or key does not exist.
 *         """
 *         self.node = ct_prev_node(self.root, key)             # <<<<<<<<<<<<<<
 *         if self.node == NULL: # given key is smallest in tree
 *             raise KeyError(str(key))
 */
  __pyx_v_self->node = ct_prev_node(__pyx_v_self->root, __pyx_v_key);

  /* "bintrees\cwalker.pyx":113
 *         """
 *         self.node = ct_prev_node(self.root, key)
 *         if self.node == NULL: # given key is smallest in tree             # <<<<<<<<<<<<<<
 *             raise KeyError(str(key))
 *         return (<object> self.node.key, <object> self.node.value)
 */
  __pyx_t_1 = (__pyx_v_self->node == NULL);
  if (__pyx_t_1) {

    /* "bintrees\cwalker.pyx":114
 *         self.node = ct_prev_node(self.root, key)
 *         if self.node == NULL: # given key is smallest in tree
 *             raise KeyError(str(key))             # <<<<<<<<<<<<<<
 *         return (<object> self.node.key, <object> self.node.value)
 *
 */
    __pyx_t_2 = PyTuple_New(1); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 114; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
    __Pyx_GOTREF(__pyx_t_2);
    __Pyx_INCREF(__pyx_v_key);
    PyTuple_SET_ITEM(__pyx_t_2, 0, __pyx_v_key);
    __Pyx_GIVEREF(__pyx_v_key);
    __pyx_t_3 = PyObject_Call(((PyObject *)((PyObject*)(&PyString_Type))), ((PyObject *)__pyx_t_2), NULL); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 114; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
    __Pyx_GOTREF(__pyx_t_3);
    __Pyx_DECREF(((PyObject *)__pyx_t_2)); __pyx_t_2 = 0;
    __pyx_t_2 = PyTuple_New(1); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 114; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
    __Pyx_GOTREF(__pyx_t_2);
    PyTuple_SET_ITEM(__pyx_t_2, 0, __pyx_t_3);
    __Pyx_GIVEREF(__pyx_t_3);
    __pyx_t_3 = 0;
    __pyx_t_3 = PyObject_Call(__pyx_builtin_KeyError, ((PyObject *)__pyx_t_2), NULL); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 114; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
    __Pyx_GOTREF(__pyx_t_3);
    __Pyx_DECREF(((PyObject *)__pyx_t_2)); __pyx_t_2 = 0;
    __Pyx_Raise(__pyx_t_3, 0, 0, 0);
    __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
    {__pyx_filename = __pyx_f[0]; __pyx_lineno = 114; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
    goto __pyx_L3;
  }
  __pyx_L3:;

  /* "bintrees\cwalker.pyx":115
 *         if self.node == NULL: # given key is smallest in tree
 *             raise KeyError(str(key))
 *         return (<object> self.node.key, <object> self.node.value)             # <<<<<<<<<<<<<<
 *
 *     def floor_item(self, key):
 */
  __Pyx_XDECREF(__pyx_r);
  __pyx_t_3 = PyTuple_New(2); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 115; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_t_3);
  __Pyx_INCREF(((PyObject *)__pyx_v_self->node->key));
  PyTuple_SET_ITEM(__pyx_t_3, 0, ((PyObject *)__pyx_v_self->node->key));
  __Pyx_GIVEREF(((PyObject *)__pyx_v_self->node->key));
  __Pyx_INCREF(((PyObject *)__pyx_v_self->node->value));
  PyTuple_SET_ITEM(__pyx_t_3, 1, ((PyObject *)__pyx_v_self->node->value));
  __Pyx_GIVEREF(((PyObject *)__pyx_v_self->node->value));
  __pyx_r = ((PyObject *)__pyx_t_3);
  __pyx_t_3 = 0;
  goto __pyx_L0;

  __pyx_r = Py_None; __Pyx_INCREF(Py_None);
  goto __pyx_L0;
  __pyx_L1_error:;
  __Pyx_XDECREF(__pyx_t_2);
  __Pyx_XDECREF(__pyx_t_3);
  __Pyx_AddTraceback("bintrees.cwalker.cWalker.prev_item", __pyx_clineno, __pyx_lineno, __pyx_filename);
  __pyx_r = NULL;
  __pyx_L0:;
  __Pyx_XGIVEREF(__pyx_r);
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* Python wrapper */
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_41floor_item(PyObject *__pyx_v_self, PyObject *__pyx_v_key); /*proto*/
static char __pyx_doc_8bintrees_7cwalker_7cWalker_40floor_item[] = " Get the element (k,v) pair associated with the greatest key less\n        than or equal to the given key, raises KeyError if there is no such key.\n        ";
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_41floor_item(PyObject *__pyx_v_self, PyObject *__pyx_v_key) {
  PyObject *__pyx_r = 0;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("floor_item (wrapper)", 0);
  __pyx_r = __pyx_pf_8bintrees_7cwalker_7cWalker_40floor_item(((struct __pyx_obj_8bintrees_7cwalker_cWalker *)__pyx_v_self), ((PyObject *)__pyx_v_key));
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* "bintrees\cwalker.pyx":117
 *         return (<object> self.node.key, <object> self.node.value)
 *
 *     def floor_item(self, key):             # <<<<<<<<<<<<<<
 *         """ Get the element (k,v) pair associated with the greatest key less
 *         than or equal to the given key, raises KeyError if there is no such key.
 */

static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_40floor_item(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self, PyObject *__pyx_v_key) {
  PyObject *__pyx_r = NULL;
  __Pyx_RefNannyDeclarations
  int __pyx_t_1;
  PyObject *__pyx_t_2 = NULL;
  PyObject *__pyx_t_3 = NULL;
  int __pyx_lineno = 0;
  const char *__pyx_filename = NULL;
  int __pyx_clineno = 0;
  __Pyx_RefNannySetupContext("floor_item", 0);

  /* "bintrees\cwalker.pyx":121
 *         than or equal to the given key, raises KeyError if there is no such key.
 *         """
 *         self.node = ct_floor_node(self.root, key)             # <<<<<<<<<<<<<<
 *         if self.node == NULL:  # given key is smaller than min-key in tree
 *             raise KeyError(str(key))
 */
  __pyx_v_self->node = ct_floor_node(__pyx_v_self->root, __pyx_v_key);

  /* "bintrees\cwalker.pyx":122
 *         """
 *         self.node = ct_floor_node(self.root, key)
 *         if self.node == NULL:  # given key is smaller than min-key in tree             # <<<<<<<<<<<<<<
 *             raise KeyError(str(key))
 *         return (<object> self.node.key, <object> self.node.value)
 */
  __pyx_t_1 = (__pyx_v_self->node == NULL);
  if (__pyx_t_1) {

    /* "bintrees\cwalker.pyx":123
 *         self.node = ct_floor_node(self.root, key)
 *         if self.node == NULL:  # given key is smaller than min-key in tree
 *             raise KeyError(str(key))             # <<<<<<<<<<<<<<
 *         return (<object> self.node.key, <object> self.node.value)
 *
 */
    __pyx_t_2 = PyTuple_New(1); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 123; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
    __Pyx_GOTREF(__pyx_t_2);
    __Pyx_INCREF(__pyx_v_key);
    PyTuple_SET_ITEM(__pyx_t_2, 0, __pyx_v_key);
    __Pyx_GIVEREF(__pyx_v_key);
    __pyx_t_3 = PyObject_Call(((PyObject *)((PyObject*)(&PyString_Type))), ((PyObject *)__pyx_t_2), NULL); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 123; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
    __Pyx_GOTREF(__pyx_t_3);
    __Pyx_DECREF(((PyObject *)__pyx_t_2)); __pyx_t_2 = 0;
    __pyx_t_2 = PyTuple_New(1); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 123; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
    __Pyx_GOTREF(__pyx_t_2);
    PyTuple_SET_ITEM(__pyx_t_2, 0, __pyx_t_3);
    __Pyx_GIVEREF(__pyx_t_3);
    __pyx_t_3 = 0;
    __pyx_t_3 = PyObject_Call(__pyx_builtin_KeyError, ((PyObject *)__pyx_t_2), NULL); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 123; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
    __Pyx_GOTREF(__pyx_t_3);
    __Pyx_DECREF(((PyObject *)__pyx_t_2)); __pyx_t_2 = 0;
    __Pyx_Raise(__pyx_t_3, 0, 0, 0);
    __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
    {__pyx_filename = __pyx_f[0]; __pyx_lineno = 123; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
    goto __pyx_L3;
  }
  __pyx_L3:;

  /* "bintrees\cwalker.pyx":124
 *         if self.node == NULL:  # given key is smaller than min-key in tree
 *             raise KeyError(str(key))
 *         return (<object> self.node.key, <object> self.node.value)             # <<<<<<<<<<<<<<
 *
 *     def ceiling_item(self, key):
 */
  __Pyx_XDECREF(__pyx_r);
  __pyx_t_3 = PyTuple_New(2); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 124; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_t_3);
  __Pyx_INCREF(((PyObject *)__pyx_v_self->node->key));
  PyTuple_SET_ITEM(__pyx_t_3, 0, ((PyObject *)__pyx_v_self->node->key));
  __Pyx_GIVEREF(((PyObject *)__pyx_v_self->node->key));
  __Pyx_INCREF(((PyObject *)__pyx_v_self->node->value));
  PyTuple_SET_ITEM(__pyx_t_3, 1, ((PyObject *)__pyx_v_self->node->value));
  __Pyx_GIVEREF(((PyObject *)__pyx_v_self->node->value));
  __pyx_r = ((PyObject *)__pyx_t_3);
  __pyx_t_3 = 0;
  goto __pyx_L0;

  __pyx_r = Py_None; __Pyx_INCREF(Py_None);
  goto __pyx_L0;
  __pyx_L1_error:;
  __Pyx_XDECREF(__pyx_t_2);
  __Pyx_XDECREF(__pyx_t_3);
  __Pyx_AddTraceback("bintrees.cwalker.cWalker.floor_item", __pyx_clineno, __pyx_lineno, __pyx_filename);
  __pyx_r = NULL;
  __pyx_L0:;
  __Pyx_XGIVEREF(__pyx_r);
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* Python wrapper */
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_43ceiling_item(PyObject *__pyx_v_self, PyObject *__pyx_v_key); /*proto*/
static char __pyx_doc_8bintrees_7cwalker_7cWalker_42ceiling_item[] = " Get the element (k,v) pair associated with the smallest key greater\n        than or equal to the given key, raises KeyError if there is no such key.\n        ";
static PyObject *__pyx_pw_8bintrees_7cwalker_7cWalker_43ceiling_item(PyObject *__pyx_v_self, PyObject *__pyx_v_key) {
  PyObject *__pyx_r = 0;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("ceiling_item (wrapper)", 0);
  __pyx_r = __pyx_pf_8bintrees_7cwalker_7cWalker_42ceiling_item(((struct __pyx_obj_8bintrees_7cwalker_cWalker *)__pyx_v_self), ((PyObject *)__pyx_v_key));
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

/* "bintrees\cwalker.pyx":126
 *         return (<object> self.node.key, <object> self.node.value)
 *
 *     def ceiling_item(self, key):             # <<<<<<<<<<<<<<
 *         """ Get the element (k,v) pair associated with the smallest key greater
 *         than or equal to the given key, raises KeyError if there is no such key.
 */

static PyObject *__pyx_pf_8bintrees_7cwalker_7cWalker_42ceiling_item(struct __pyx_obj_8bintrees_7cwalker_cWalker *__pyx_v_self, PyObject *__pyx_v_key) {
  PyObject *__pyx_r = NULL;
  __Pyx_RefNannyDeclarations
  int __pyx_t_1;
  PyObject *__pyx_t_2 = NULL;
  PyObject *__pyx_t_3 = NULL;
  int __pyx_lineno = 0;
  const char *__pyx_filename = NULL;
  int __pyx_clineno = 0;
  __Pyx_RefNannySetupContext("ceiling_item", 0);

  /* "bintrees\cwalker.pyx":130
 *         than or equal to the given key, raises KeyError if there is no such key.
 *         """
 *         self.node = ct_ceiling_node(self.root, key)             # <<<<<<<<<<<<<<
 *         if self.node == NULL:  # given key is greater than max-key in tree
 *             raise KeyError(str(key))
 */
  __pyx_v_self->node = ct_ceiling_node(__pyx_v_self->root, __pyx_v_key);

  /* "bintrees\cwalker.pyx":131
 *         """
 *         self.node = ct_ceiling_node(self.root, key)
 *         if self.node == NULL:  # given key is greater than max-key in tree             # <<<<<<<<<<<<<<
 *             raise KeyError(str(key))
 *         return (<object> self.node.key, <object> self.node.value)
 */
  __pyx_t_1 = (__pyx_v_self->node == NULL);
  if (__pyx_t_1) {

    /* "bintrees\cwalker.pyx":132
 *         self.node = ct_ceiling_node(self.root, key)
 *         if self.node == NULL:  # given key is greater than max-key in tree
 *             raise KeyError(str(key))             # <<<<<<<<<<<<<<
 *         return (<object> self.node.key, <object> self.node.value)
 */
    __pyx_t_2 = PyTuple_New(1); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 132; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
    __Pyx_GOTREF(__pyx_t_2);
    __Pyx_INCREF(__pyx_v_key);
    PyTuple_SET_ITEM(__pyx_t_2, 0, __pyx_v_key);
    __Pyx_GIVEREF(__pyx_v_key);
    __pyx_t_3 = PyObject_Call(((PyObject *)((PyObject*)(&PyString_Type))), ((PyObject *)__pyx_t_2), NULL); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 132; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
    __Pyx_GOTREF(__pyx_t_3);
    __Pyx_DECREF(((PyObject *)__pyx_t_2)); __pyx_t_2 = 0;
    __pyx_t_2 = PyTuple_New(1); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 132; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
    __Pyx_GOTREF(__pyx_t_2);
    PyTuple_SET_ITEM(__pyx_t_2, 0, __pyx_t_3);
    __Pyx_GIVEREF(__pyx_t_3);
    __pyx_t_3 = 0;
    __pyx_t_3 = PyObject_Call(__pyx_builtin_KeyError, ((PyObject *)__pyx_t_2), NULL); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 132; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
    __Pyx_GOTREF(__pyx_t_3);
    __Pyx_DECREF(((PyObject *)__pyx_t_2)); __pyx_t_2 = 0;
    __Pyx_Raise(__pyx_t_3, 0, 0, 0);
    __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
    {__pyx_filename = __pyx_f[0]; __pyx_lineno = 132; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
    goto __pyx_L3;
  }
  __pyx_L3:;

  /* "bintrees\cwalker.pyx":133
 *         if self.node == NULL:  # given key is greater than max-key in tree
 *             raise KeyError(str(key))
 *         return (<object> self.node.key, <object> self.node.value)             # <<<<<<<<<<<<<<
 */
  __Pyx_XDECREF(__pyx_r);
  __pyx_t_3 = PyTuple_New(2); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 133; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_t_3);
  __Pyx_INCREF(((PyObject *)__pyx_v_self->node->key));
  PyTuple_SET_ITEM(__pyx_t_3, 0, ((PyObject *)__pyx_v_self->node->key));
  __Pyx_GIVEREF(((PyObject *)__pyx_v_self->node->key));
  __Pyx_INCREF(((PyObject *)__pyx_v_self->node->value));
  PyTuple_SET_ITEM(__pyx_t_3, 1, ((PyObject *)__pyx_v_self->node->value));
  __Pyx_GIVEREF(((PyObject *)__pyx_v_self->node->value));
  __pyx_r = ((PyObject *)__pyx_t_3);
  __pyx_t_3 = 0;
  goto __pyx_L0;

  __pyx_r = Py_None; __Pyx_INCREF(Py_None);
  goto __pyx_L0;
  __pyx_L1_error:;
  __Pyx_XDECREF(__pyx_t_2);
  __Pyx_XDECREF(__pyx_t_3);
  __Pyx_AddTraceback("bintrees.cwalker.cWalker.ceiling_item", __pyx_clineno, __pyx_lineno, __pyx_filename);
  __pyx_r = NULL;
  __pyx_L0:;
  __Pyx_XGIVEREF(__pyx_r);
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}
static struct __pyx_vtabstruct_8bintrees_7cwalker_cWalker __pyx_vtable_8bintrees_7cwalker_cWalker;

static PyObject *__pyx_tp_new_8bintrees_7cwalker_cWalker(PyTypeObject *t, CYTHON_UNUSED PyObject *a, CYTHON_UNUSED PyObject *k) {
  struct __pyx_obj_8bintrees_7cwalker_cWalker *p;
  PyObject *o = (*t->tp_alloc)(t, 0);
  if (!o) return 0;
  p = ((struct __pyx_obj_8bintrees_7cwalker_cWalker *)o);
  p->__pyx_vtab = __pyx_vtabptr_8bintrees_7cwalker_cWalker;
  if (__pyx_pw_8bintrees_7cwalker_7cWalker_1__cinit__(o, __pyx_empty_tuple, NULL) < 0) {
    Py_DECREF(o); o = 0;
  }
  return o;
}

static void __pyx_tp_dealloc_8bintrees_7cwalker_cWalker(PyObject *o) {
  {
    PyObject *etype, *eval, *etb;
    PyErr_Fetch(&etype, &eval, &etb);
    ++Py_REFCNT(o);
    __pyx_pw_8bintrees_7cwalker_7cWalker_3__dealloc__(o);
    if (PyErr_Occurred()) PyErr_WriteUnraisable(o);
    --Py_REFCNT(o);
    PyErr_Restore(etype, eval, etb);
  }
  (*Py_TYPE(o)->tp_free)(o);
}

static PyMethodDef __pyx_methods_8bintrees_7cwalker_cWalker[] = {
  {__Pyx_NAMESTR("reset"), (PyCFunction)__pyx_pw_8bintrees_7cwalker_7cWalker_5reset, METH_NOARGS, __Pyx_DOCSTR(0)},
  {__Pyx_NAMESTR("key"), (PyCFunction)__pyx_pw_8bintrees_7cwalker_7cWalker_7key, METH_NOARGS, __Pyx_DOCSTR(0)},
  {__Pyx_NAMESTR("value"), (PyCFunction)__pyx_pw_8bintrees_7cwalker_7cWalker_9value, METH_NOARGS, __Pyx_DOCSTR(0)},
  {__Pyx_NAMESTR("item"), (PyCFunction)__pyx_pw_8bintrees_7cwalker_7cWalker_11item, METH_NOARGS, __Pyx_DOCSTR(0)},
  {__Pyx_NAMESTR("is_valid"), (PyCFunction)__pyx_pw_8bintrees_7cwalker_7cWalker_13is_valid, METH_NOARGS, __Pyx_DOCSTR(0)},
  {__Pyx_NAMESTR("goto"), (PyCFunction)__pyx_pw_8bintrees_7cwalker_7cWalker_15goto, METH_O, __Pyx_DOCSTR(0)},
  {__Pyx_NAMESTR("push"), (PyCFunction)__pyx_pw_8bintrees_7cwalker_7cWalker_17push, METH_NOARGS, __Pyx_DOCSTR(0)},
  {__Pyx_NAMESTR("pop"), (PyCFunction)__pyx_pw_8bintrees_7cwalker_7cWalker_19pop, METH_NOARGS, __Pyx_DOCSTR(0)},
  {__Pyx_NAMESTR("stack_is_empty"), (PyCFunction)__pyx_pw_8bintrees_7cwalker_7cWalker_21stack_is_empty, METH_NOARGS, __Pyx_DOCSTR(0)},
  {__Pyx_NAMESTR("goto_leaf"), (PyCFunction)__pyx_pw_8bintrees_7cwalker_7cWalker_23goto_leaf, METH_NOARGS, __Pyx_DOCSTR(__pyx_doc_8bintrees_7cwalker_7cWalker_22goto_leaf)},
  {__Pyx_NAMESTR("has_child"), (PyCFunction)__pyx_pw_8bintrees_7cwalker_7cWalker_25has_child, METH_O, __Pyx_DOCSTR(0)},
  {__Pyx_NAMESTR("down"), (PyCFunction)__pyx_pw_8bintrees_7cwalker_7cWalker_27down, METH_O, __Pyx_DOCSTR(0)},
  {__Pyx_NAMESTR("go_left"), (PyCFunction)__pyx_pw_8bintrees_7cwalker_7cWalker_29go_left, METH_NOARGS, __Pyx_DOCSTR(0)},
  {__Pyx_NAMESTR("go_right"), (PyCFunction)__pyx_pw_8bintrees_7cwalker_7cWalker_31go_right, METH_NOARGS, __Pyx_DOCSTR(0)},
  {__Pyx_NAMESTR("has_left"), (PyCFunction)__pyx_pw_8bintrees_7cwalker_7cWalker_33has_left, METH_NOARGS, __Pyx_DOCSTR(0)},
  {__Pyx_NAMESTR("has_right"), (PyCFunction)__pyx_pw_8bintrees_7cwalker_7cWalker_35has_right, METH_NOARGS, __Pyx_DOCSTR(0)},
  {__Pyx_NAMESTR("succ_item"), (PyCFunction)__pyx_pw_8bintrees_7cwalker_7cWalker_37succ_item, METH_O, __Pyx_DOCSTR(__pyx_doc_8bintrees_7cwalker_7cWalker_36succ_item)},
  {__Pyx_NAMESTR("prev_item"), (PyCFunction)__pyx_pw_8bintrees_7cwalker_7cWalker_39prev_item, METH_O, __Pyx_DOCSTR(__pyx_doc_8bintrees_7cwalker_7cWalker_38prev_item)},
  {__Pyx_NAMESTR("floor_item"), (PyCFunction)__pyx_pw_8bintrees_7cwalker_7cWalker_41floor_item, METH_O, __Pyx_DOCSTR(__pyx_doc_8bintrees_7cwalker_7cWalker_40floor_item)},
  {__Pyx_NAMESTR("ceiling_item"), (PyCFunction)__pyx_pw_8bintrees_7cwalker_7cWalker_43ceiling_item, METH_O, __Pyx_DOCSTR(__pyx_doc_8bintrees_7cwalker_7cWalker_42ceiling_item)},
  {0, 0, 0, 0}
};

static PyNumberMethods __pyx_tp_as_number_cWalker = {
  0, /*nb_add*/
  0, /*nb_subtract*/
  0, /*nb_multiply*/
  #if PY_MAJOR_VERSION < 3
  0, /*nb_divide*/
  #endif
  0, /*nb_remainder*/
  0, /*nb_divmod*/
  0, /*nb_power*/
  0, /*nb_negative*/
  0, /*nb_positive*/
  0, /*nb_absolute*/
  0, /*nb_nonzero*/
  0, /*nb_invert*/
  0, /*nb_lshift*/
  0, /*nb_rshift*/
  0, /*nb_and*/
  0, /*nb_xor*/
  0, /*nb_or*/
  #if PY_MAJOR_VERSION < 3
  0, /*nb_coerce*/
  #endif
  0, /*nb_int*/
  #if PY_MAJOR_VERSION < 3
  0, /*nb_long*/
  #else
  0, /*reserved*/
  #endif
  0, /*nb_float*/
  #if PY_MAJOR_VERSION < 3
  0, /*nb_oct*/
  #endif
  #if PY_MAJOR_VERSION < 3
  0, /*nb_hex*/
  #endif
  0, /*nb_inplace_add*/
  0, /*nb_inplace_subtract*/
  0, /*nb_inplace_multiply*/
  #if PY_MAJOR_VERSION < 3
  0, /*nb_inplace_divide*/
  #endif
  0, /*nb_inplace_remainder*/
  0, /*nb_inplace_power*/
  0, /*nb_inplace_lshift*/
  0, /*nb_inplace_rshift*/
  0, /*nb_inplace_and*/
  0, /*nb_inplace_xor*/
  0, /*nb_inplace_or*/
  0, /*nb_floor_divide*/
  0, /*nb_true_divide*/
  0, /*nb_inplace_floor_divide*/
  0, /*nb_inplace_true_divide*/
  #if PY_VERSION_HEX >= 0x02050000
  0, /*nb_index*/
  #endif
};

static PySequenceMethods __pyx_tp_as_sequence_cWalker = {
  0, /*sq_length*/
  0, /*sq_concat*/
  0, /*sq_repeat*/
  0, /*sq_item*/
  0, /*sq_slice*/
  0, /*sq_ass_item*/
  0, /*sq_ass_slice*/
  0, /*sq_contains*/
  0, /*sq_inplace_concat*/
  0, /*sq_inplace_repeat*/
};

static PyMappingMethods __pyx_tp_as_mapping_cWalker = {
  0, /*mp_length*/
  0, /*mp_subscript*/
  0, /*mp_ass_subscript*/
};

static PyBufferProcs __pyx_tp_as_buffer_cWalker = {
  #if PY_MAJOR_VERSION < 3
  0, /*bf_getreadbuffer*/
  #endif
  #if PY_MAJOR_VERSION < 3
  0, /*bf_getwritebuffer*/
  #endif
  #if PY_MAJOR_VERSION < 3
  0, /*bf_getsegcount*/
  #endif
  #if PY_MAJOR_VERSION < 3
  0, /*bf_getcharbuffer*/
  #endif
  #if PY_VERSION_HEX >= 0x02060000
  0, /*bf_getbuffer*/
  #endif
  #if PY_VERSION_HEX >= 0x02060000
  0, /*bf_releasebuffer*/
  #endif
};

static PyTypeObject __pyx_type_8bintrees_7cwalker_cWalker = {
  PyVarObject_HEAD_INIT(0, 0)
  __Pyx_NAMESTR("bintrees.cwalker.cWalker"), /*tp_name*/
  sizeof(struct __pyx_obj_8bintrees_7cwalker_cWalker), /*tp_basicsize*/
  0, /*tp_itemsize*/
  __pyx_tp_dealloc_8bintrees_7cwalker_cWalker, /*tp_dealloc*/
  0, /*tp_print*/
  0, /*tp_getattr*/
  0, /*tp_setattr*/
  #if PY_MAJOR_VERSION < 3
  0, /*tp_compare*/
  #else
  0, /*reserved*/
  #endif
  0, /*tp_repr*/
  &__pyx_tp_as_number_cWalker, /*tp_as_number*/
  &__pyx_tp_as_sequence_cWalker, /*tp_as_sequence*/
  &__pyx_tp_as_mapping_cWalker, /*tp_as_mapping*/
  0, /*tp_hash*/
  0, /*tp_call*/
  0, /*tp_str*/
  0, /*tp_getattro*/
  0, /*tp_setattro*/
  &__pyx_tp_as_buffer_cWalker, /*tp_as_buffer*/
  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_BASETYPE, /*tp_flags*/
  0, /*tp_doc*/
  0, /*tp_traverse*/
  0, /*tp_clear*/
  0, /*tp_richcompare*/
  0, /*tp_weaklistoffset*/
  0, /*tp_iter*/
  0, /*tp_iternext*/
  __pyx_methods_8bintrees_7cwalker_cWalker, /*tp_methods*/
  0, /*tp_members*/
  0, /*tp_getset*/
  0, /*tp_base*/
  0, /*tp_dict*/
  0, /*tp_descr_get*/
  0, /*tp_descr_set*/
  0, /*tp_dictoffset*/
  0, /*tp_init*/
  0, /*tp_alloc*/
  __pyx_tp_new_8bintrees_7cwalker_cWalker, /*tp_new*/
  0, /*tp_free*/
  0, /*tp_is_gc*/
  0, /*tp_bases*/
  0, /*tp_mro*/
  0, /*tp_cache*/
  0, /*tp_subclasses*/
  0, /*tp_weaklist*/
  0, /*tp_del*/
  #if PY_VERSION_HEX >= 0x02060000
  0, /*tp_version_tag*/
  #endif
};

static PyMethodDef __pyx_methods[] = {
  {0, 0, 0, 0}
};

#if PY_MAJOR_VERSION >= 3
static struct PyModuleDef __pyx_moduledef = {
    PyModuleDef_HEAD_INIT,
    __Pyx_NAMESTR("cwalker"),
    0, /* m_doc */
    -1, /* m_size */
    __pyx_methods /* m_methods */,
    NULL, /* m_reload */
    NULL, /* m_traverse */
    NULL, /* m_clear */
    NULL /* m_free */
};
#endif

static __Pyx_StringTabEntry __pyx_string_tab[] = {
  {&__pyx_kp_s_1, __pyx_k_1, sizeof(__pyx_k_1), 0, 0, 1, 0},
  {&__pyx_n_s__IndexError, __pyx_k__IndexError, sizeof(__pyx_k__IndexError), 0, 0, 1, 1},
  {&__pyx_n_s__KeyError, __pyx_k__KeyError, sizeof(__pyx_k__KeyError), 0, 0, 1, 1},
  {&__pyx_n_s____main__, __pyx_k____main__, sizeof(__pyx_k____main__), 0, 0, 1, 1},
  {&__pyx_n_s____test__, __pyx_k____test__, sizeof(__pyx_k____test__), 0, 0, 1, 1},
  {&__pyx_n_s__is_valid, __pyx_k__is_valid, sizeof(__pyx_k__is_valid), 0, 0, 1, 1},
  {&__pyx_n_s__item, __pyx_k__item, sizeof(__pyx_k__item), 0, 0, 1, 1},
  {&__pyx_n_s__key, __pyx_k__key, sizeof(__pyx_k__key), 0, 0, 1, 1},
  {&__pyx_n_s__pop, __pyx_k__pop, sizeof(__pyx_k__pop), 0, 0, 1, 1},
  {&__pyx_n_s__property, __pyx_k__property, sizeof(__pyx_k__property), 0, 0, 1, 1},
  {&__pyx_n_s__push, __pyx_k__push, sizeof(__pyx_k__push), 0, 0, 1, 1},
  {&__pyx_n_s__reset, __pyx_k__reset, sizeof(__pyx_k__reset), 0, 0, 1, 1},
  {&__pyx_n_s__value, __pyx_k__value, sizeof(__pyx_k__value), 0, 0, 1, 1},
  {0, 0, 0, 0, 0, 0, 0}
};
static int __Pyx_InitCachedBuiltins(void) {
  __pyx_builtin_property = __Pyx_GetName(__pyx_b, __pyx_n_s__property); if (!__pyx_builtin_property) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __pyx_builtin_IndexError = __Pyx_GetName(__pyx_b, __pyx_n_s__IndexError); if (!__pyx_builtin_IndexError) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 65; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __pyx_builtin_KeyError = __Pyx_GetName(__pyx_b, __pyx_n_s__KeyError); if (!__pyx_builtin_KeyError) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 105; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  return 0;
  __pyx_L1_error:;
  return -1;
}

static int __Pyx_InitCachedConstants(void) {
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("__Pyx_InitCachedConstants", 0);

  /* "bintrees\cwalker.pyx":65
 *     cpdef pop(self):
 *         if stack_is_empty(self.stack) != 0:
 *             raise IndexError('pop(): stack is empty')             # <<<<<<<<<<<<<<
 *         self.node = stack_pop(self.stack)
 *
 */
  __pyx_k_tuple_2 = PyTuple_New(1); if (unlikely(!__pyx_k_tuple_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 65; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_k_tuple_2);
  __Pyx_INCREF(((PyObject *)__pyx_kp_s_1));
  PyTuple_SET_ITEM(__pyx_k_tuple_2, 0, ((PyObject *)__pyx_kp_s_1));
  __Pyx_GIVEREF(((PyObject *)__pyx_kp_s_1));
  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_2));
  __Pyx_RefNannyFinishContext();
  return 0;
  __pyx_L1_error:;
  __Pyx_RefNannyFinishContext();
  return -1;
}

static int __Pyx_InitGlobals(void) {
  if (__Pyx_InitStrings(__pyx_string_tab) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;};
  return 0;
  __pyx_L1_error:;
  return -1;
}

#if PY_MAJOR_VERSION < 3
PyMODINIT_FUNC initcwalker(void); /*proto*/
PyMODINIT_FUNC initcwalker(void)
#else
PyMODINIT_FUNC PyInit_cwalker(void); /*proto*/
PyMODINIT_FUNC PyInit_cwalker(void)
#endif
{
  PyObject *__pyx_t_1 = NULL;
  PyObject *__pyx_t_2 = NULL;
  __Pyx_RefNannyDeclarations
  #if CYTHON_REFNANNY
  __Pyx_RefNanny = __Pyx_RefNannyImportAPI("refnanny");
  if (!__Pyx_RefNanny) {
      PyErr_Clear();
      __Pyx_RefNanny = __Pyx_RefNannyImportAPI("Cython.Runtime.refnanny");
      if (!__Pyx_RefNanny)
          Py_FatalError("failed to import 'refnanny' module");
  }
  #endif
  __Pyx_RefNannySetupContext("PyMODINIT_FUNC PyInit_cwalker(void)", 0);
  if ( __Pyx_check_binary_version() < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __pyx_empty_tuple = PyTuple_New(0); if (unlikely(!__pyx_empty_tuple)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __pyx_empty_bytes = PyBytes_FromStringAndSize("", 0); if (unlikely(!__pyx_empty_bytes)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  #ifdef __Pyx_CyFunction_USED
  if (__Pyx_CyFunction_init() < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  #endif
  #ifdef __Pyx_FusedFunction_USED
  if (__pyx_FusedFunction_init() < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  #endif
  #ifdef __Pyx_Generator_USED
  if (__pyx_Generator_init() < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  #endif
  /*--- Library function declarations ---*/
  /*--- Threads initialization code ---*/
  #if defined(__PYX_FORCE_INIT_THREADS) && __PYX_FORCE_INIT_THREADS
  #ifdef WITH_THREAD /* Python build with threading support? */
  PyEval_InitThreads();
  #endif
  #endif
  /*--- Module creation code ---*/
  #if PY_MAJOR_VERSION < 3
  __pyx_m = Py_InitModule4(__Pyx_NAMESTR("cwalker"), __pyx_methods, 0, 0, PYTHON_API_VERSION); Py_XINCREF(__pyx_m);
  #else
  __pyx_m = PyModule_Create(&__pyx_moduledef);
  #endif
  if (unlikely(!__pyx_m)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  #if PY_MAJOR_VERSION >= 3
  {
    PyObject *modules = PyImport_GetModuleDict(); if (unlikely(!modules)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
    if (!PyDict_GetItemString(modules, "bintrees.cwalker")) {
      if (unlikely(PyDict_SetItemString(modules, "bintrees.cwalker", __pyx_m) < 0)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
    }
  }
  #endif
  __pyx_b = PyImport_AddModule(__Pyx_NAMESTR(__Pyx_BUILTIN_MODULE_NAME)); if (unlikely(!__pyx_b)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  #if CYTHON_COMPILING_IN_PYPY
  Py_INCREF(__pyx_b);
  #endif
  if (__Pyx_SetAttrString(__pyx_m, "__builtins__", __pyx_b) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;};
  /*--- Initialize various global constants etc. ---*/
  if (unlikely(__Pyx_InitGlobals() < 0)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  if (__pyx_module_is_main_bintrees__cwalker) {
    if (__Pyx_SetAttrString(__pyx_m, "__name__", __pyx_n_s____main__) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;};
  }
  /*--- Builtin init code ---*/
  if (unlikely(__Pyx_InitCachedBuiltins() < 0)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  /*--- Constants init code ---*/
  if (unlikely(__Pyx_InitCachedConstants() < 0)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  /*--- Global init code ---*/
  /*--- Variable export code ---*/
  /*--- Function export code ---*/
  /*--- Type init code ---*/
  __pyx_vtabptr_8bintrees_7cwalker_cWalker = &__pyx_vtable_8bintrees_7cwalker_cWalker;
  __pyx_vtable_8bintrees_7cwalker_cWalker.set_tree = (void (*)(struct __pyx_obj_8bintrees_7cwalker_cWalker *, node_t *))__pyx_f_8bintrees_7cwalker_7cWalker_set_tree;
  __pyx_vtable_8bintrees_7cwalker_cWalker.reset = (PyObject *(*)(struct __pyx_obj_8bintrees_7cwalker_cWalker *, int __pyx_skip_dispatch))__pyx_f_8bintrees_7cwalker_7cWalker_reset;
  __pyx_vtable_8bintrees_7cwalker_cWalker.push = (PyObject *(*)(struct __pyx_obj_8bintrees_7cwalker_cWalker *, int __pyx_skip_dispatch))__pyx_f_8bintrees_7cwalker_7cWalker_push;
  __pyx_vtable_8bintrees_7cwalker_cWalker.pop = (PyObject *(*)(struct __pyx_obj_8bintrees_7cwalker_cWalker *, int __pyx_skip_dispatch))__pyx_f_8bintrees_7cwalker_7cWalker_pop;
  if (PyType_Ready(&__pyx_type_8bintrees_7cwalker_cWalker) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 14; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  if (__Pyx_SetVtable(__pyx_type_8bintrees_7cwalker_cWalker.tp_dict, __pyx_vtabptr_8bintrees_7cwalker_cWalker) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 14; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  if (__Pyx_SetAttrString(__pyx_m, "cWalker", (PyObject *)&__pyx_type_8bintrees_7cwalker_cWalker) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 14; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __pyx_ptype_8bintrees_7cwalker_cWalker = &__pyx_type_8bintrees_7cwalker_cWalker;
  /*--- Type import code ---*/
  /*--- Variable import code ---*/
  /*--- Function import code ---*/
  /*--- Execution code ---*/

  /* "bintrees\cwalker.pyx":32
 *
 *     @property
 *     def key(self):             # <<<<<<<<<<<<<<
 *         return <object> self.node.key
 *
 */
  __pyx_t_1 = __Pyx_GetName((PyObject *)__pyx_ptype_8bintrees_7cwalker_cWalker, __pyx_n_s__key); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 32; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_t_1);
  __pyx_t_2 = PyTuple_New(1); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_t_2);
  PyTuple_SET_ITEM(__pyx_t_2, 0, __pyx_t_1);
  __Pyx_GIVEREF(__pyx_t_1);
  __pyx_t_1 = 0;
  __pyx_t_1 = PyObject_Call(__pyx_builtin_property, ((PyObject *)__pyx_t_2), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_t_1);
  __Pyx_DECREF(((PyObject *)__pyx_t_2)); __pyx_t_2 = 0;
  if (PyDict_SetItem((PyObject *)__pyx_ptype_8bintrees_7cwalker_cWalker->tp_dict, __pyx_n_s__key, __pyx_t_1) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 32; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
  PyType_Modified(__pyx_ptype_8bintrees_7cwalker_cWalker);

  /* "bintrees\cwalker.pyx":36
 *
 *     @property
 *     def value(self):             # <<<<<<<<<<<<<<
 *         return <object> self.node.value
 *
 */
  __pyx_t_1 = __Pyx_GetName((PyObject *)__pyx_ptype_8bintrees_7cwalker_cWalker, __pyx_n_s__value); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 36; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_t_1);
  __pyx_t_2 = PyTuple_New(1); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 35; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_t_2);
  PyTuple_SET_ITEM(__pyx_t_2, 0, __pyx_t_1);
  __Pyx_GIVEREF(__pyx_t_1);
  __pyx_t_1 = 0;
  __pyx_t_1 = PyObject_Call(__pyx_builtin_property, ((PyObject *)__pyx_t_2), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 35; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_t_1);
  __Pyx_DECREF(((PyObject *)__pyx_t_2)); __pyx_t_2 = 0;
  if (PyDict_SetItem((PyObject *)__pyx_ptype_8bintrees_7cwalker_cWalker->tp_dict, __pyx_n_s__value, __pyx_t_1) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 36; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
  PyType_Modified(__pyx_ptype_8bintrees_7cwalker_cWalker);

  /* "bintrees\cwalker.pyx":40
 *
 *     @property
 *     def item(self):             # <<<<<<<<<<<<<<
 *         return (<object>self.node.key, <object>self.node.value)
 *
 */
  __pyx_t_1 = __Pyx_GetName((PyObject *)__pyx_ptype_8bintrees_7cwalker_cWalker, __pyx_n_s__item); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 40; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_t_1);
  __pyx_t_2 = PyTuple_New(1); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 39; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_t_2);
  PyTuple_SET_ITEM(__pyx_t_2, 0, __pyx_t_1);
  __Pyx_GIVEREF(__pyx_t_1);
  __pyx_t_1 = 0;
  __pyx_t_1 = PyObject_Call(__pyx_builtin_property, ((PyObject *)__pyx_t_2), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 39; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_t_1);
  __Pyx_DECREF(((PyObject *)__pyx_t_2)); __pyx_t_2 = 0;
  if (PyDict_SetItem((PyObject *)__pyx_ptype_8bintrees_7cwalker_cWalker->tp_dict, __pyx_n_s__item, __pyx_t_1) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 40; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
  PyType_Modified(__pyx_ptype_8bintrees_7cwalker_cWalker);

  /* "bintrees\cwalker.pyx":44
 *
 *     @property
 *     def is_valid(self):             # <<<<<<<<<<<<<<
 *         return self.node != NULL
 *
 */
  __pyx_t_1 = __Pyx_GetName((PyObject *)__pyx_ptype_8bintrees_7cwalker_cWalker, __pyx_n_s__is_valid); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 44; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_t_1);
  __pyx_t_2 = PyTuple_New(1); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 43; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_t_2);
  PyTuple_SET_ITEM(__pyx_t_2, 0, __pyx_t_1);
  __Pyx_GIVEREF(__pyx_t_1);
  __pyx_t_1 = 0;
  __pyx_t_1 = PyObject_Call(__pyx_builtin_property, ((PyObject *)__pyx_t_2), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 43; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_t_1);
  __Pyx_DECREF(((PyObject *)__pyx_t_2)); __pyx_t_2 = 0;
  if (PyDict_SetItem((PyObject *)__pyx_ptype_8bintrees_7cwalker_cWalker->tp_dict, __pyx_n_s__is_valid, __pyx_t_1) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 44; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
  PyType_Modified(__pyx_ptype_8bintrees_7cwalker_cWalker);

  /* "bintrees\cwalker.pyx":1
 * #!/usr/bin/env python             # <<<<<<<<<<<<<<
 * #coding:utf-8
 * # Author:  mozman
 */
  __pyx_t_1 = PyDict_New(); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(((PyObject *)__pyx_t_1));
  if (PyObject_SetAttr(__pyx_m, __pyx_n_s____test__, ((PyObject *)__pyx_t_1)) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_DECREF(((PyObject *)__pyx_t_1)); __pyx_t_1 = 0;
  goto __pyx_L0;
  __pyx_L1_error:;
  __Pyx_XDECREF(__pyx_t_1);
  __Pyx_XDECREF(__pyx_t_2);
  if (__pyx_m) {
    __Pyx_AddTraceback("init bintrees.cwalker", __pyx_clineno, __pyx_lineno, __pyx_filename);
    Py_DECREF(__pyx_m); __pyx_m = 0;
  } else if (!PyErr_Occurred()) {
    PyErr_SetString(PyExc_ImportError, "init bintrees.cwalker");
  }
  __pyx_L0:;
  __Pyx_RefNannyFinishContext();
  #if PY_MAJOR_VERSION < 3
  return;
  #else
  return __pyx_m;
  #endif
}

/* Runtime support code */
#if CYTHON_REFNANNY
static __Pyx_RefNannyAPIStruct *__Pyx_RefNannyImportAPI(const char *modname) {
    PyObject *m = NULL, *p = NULL;
    void *r = NULL;
    m = PyImport_ImportModule((char *)modname);
    if (!m) goto end;
    p = PyObject_GetAttrString(m, (char *)"RefNannyAPI");
    if (!p) goto end;
    r = PyLong_AsVoidPtr(p);
end:
    Py_XDECREF(p);
    Py_XDECREF(m);
    return (__Pyx_RefNannyAPIStruct *)r;
}
#endif /* CYTHON_REFNANNY */

static PyObject *__Pyx_GetName(PyObject *dict, PyObject *name) {
    PyObject *result;
    result = PyObject_GetAttr(dict, name);
    if (!result) {
        if (dict != __pyx_b) {
            PyErr_Clear();
            result = PyObject_GetAttr(__pyx_b, name);
        }
        if (!result) {
            PyErr_SetObject(PyExc_NameError, name);
        }
    }
    return result;
}

static void __Pyx_RaiseArgtupleInvalid(
    const char* func_name,
    int exact,
    Py_ssize_t num_min,
    Py_ssize_t num_max,
    Py_ssize_t num_found)
{
    Py_ssize_t num_expected;
    const char *more_or_less;
    if (num_found < num_min) {
        num_expected = num_min;
        more_or_less = "at least";
    } else {
        num_expected = num_max;
        more_or_less = "at most";
    }
    if (exact) {
        more_or_less = "exactly";
    }
    PyErr_Format(PyExc_TypeError,
                 "%s() takes %s %" CYTHON_FORMAT_SSIZE_T "d positional argument%s (%" CYTHON_FORMAT_SSIZE_T "d given)",
                 func_name, more_or_less, num_expected,
                 (num_expected == 1) ? "" : "s", num_found);
}

static CYTHON_INLINE int __Pyx_CheckKeywordStrings(
    PyObject *kwdict,
    const char* function_name,
    int kw_allowed)
{
    PyObject* key = 0;
    Py_ssize_t pos = 0;
#if CPYTHON_COMPILING_IN_PYPY
    if (!kw_allowed && PyDict_Next(kwdict, &pos, &key, 0))
        goto invalid_keyword;
    return 1;
#else
    while (PyDict_Next(kwdict, &pos, &key, 0)) {
        #if PY_MAJOR_VERSION < 3
        if (unlikely(!PyString_CheckExact(key)) && unlikely(!PyString_Check(key)))
        #endif
            if (unlikely(!PyUnicode_Check(key)))
                goto invalid_keyword_type;
    }
    if ((!kw_allowed) && unlikely(key))
        goto invalid_keyword;
    return 1;
invalid_keyword_type:
    PyErr_Format(PyExc_TypeError,
        "%s() keywords must be strings", function_name);
    return 0;
#endif
invalid_keyword:
    PyErr_Format(PyExc_TypeError,
    #if PY_MAJOR_VERSION < 3
        "%s() got an unexpected keyword argument '%s'",
        function_name, PyString_AsString(key));
    #else
        "%s() got an unexpected keyword argument '%U'",
        function_name, key);
    #endif
    return 0;
}

static CYTHON_INLINE void __Pyx_ErrRestore(PyObject *type, PyObject *value, PyObject *tb) {
#if CYTHON_COMPILING_IN_CPYTHON
    PyObject *tmp_type, *tmp_value, *tmp_tb;
    PyThreadState *tstate = PyThreadState_GET();
    tmp_type = tstate->curexc_type;
    tmp_value = tstate->curexc_value;
    tmp_tb = tstate->curexc_traceback;
    tstate->curexc_type = type;
    tstate->curexc_value = value;
    tstate->curexc_traceback = tb;
    Py_XDECREF(tmp_type);
    Py_XDECREF(tmp_value);
    Py_XDECREF(tmp_tb);
#else
    PyErr_Restore(type, value, tb);
#endif
}
static CYTHON_INLINE void __Pyx_ErrFetch(PyObject **type, PyObject **value, PyObject **tb) {
#if CYTHON_COMPILING_IN_CPYTHON
    PyThreadState *tstate = PyThreadState_GET();
    *type = tstate->curexc_type;
    *value = tstate->curexc_value;
    *tb = tstate->curexc_traceback;
    tstate->curexc_type = 0;
    tstate->curexc_value = 0;
    tstate->curexc_traceback = 0;
#else
    PyErr_Fetch(type, value, tb);
#endif
}

#if PY_MAJOR_VERSION < 3
static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb,
                        CYTHON_UNUSED PyObject *cause) {
    Py_XINCREF(type);
    if (!value || value == Py_None)
        value = NULL;
    else
        Py_INCREF(value);
    if (!tb || tb == Py_None)
        tb = NULL;
    else {
        Py_INCREF(tb);
        if (!PyTraceBack_Check(tb)) {
            PyErr_SetString(PyExc_TypeError,
                "raise: arg 3 must be a traceback or None");
            goto raise_error;
        }
    }
    #if PY_VERSION_HEX < 0x02050000
    if (PyClass_Check(type)) {
    #else
    if (PyType_Check(type)) {
    #endif
#if CYTHON_COMPILING_IN_PYPY
        if (!value) {
            Py_INCREF(Py_None);
            value = Py_None;
        }
#endif
        PyErr_NormalizeException(&type, &value, &tb);
    } else {
        if (value) {
            PyErr_SetString(PyExc_TypeError,
                "instance exception may not have a separate value");
            goto raise_error;
        }
        value = type;
        #if PY_VERSION_HEX < 0x02050000
            if (PyInstance_Check(type)) {
                type = (PyObject*) ((PyInstanceObject*)type)->in_class;
                Py_INCREF(type);
            }
            else {
                type = 0;
                PyErr_SetString(PyExc_TypeError,
                    "raise: exception must be an old-style class or instance");
                goto raise_error;
            }
        #else
            type = (PyObject*) Py_TYPE(type);
            Py_INCREF(type);
            if (!PyType_IsSubtype((PyTypeObject *)type, (PyTypeObject *)PyExc_BaseException)) {
                PyErr_SetString(PyExc_TypeError,
                    "raise: exception class must be a subclass of BaseException");
                goto raise_error;
            }
        #endif
    }
    __Pyx_ErrRestore(type, value, tb);
    return;
raise_error:
    Py_XDECREF(value);
    Py_XDECREF(type);
    Py_XDECREF(tb);
    return;
}
#else /* Python 3+ */
static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb, PyObject *cause) {
    PyObject* owned_instance = NULL;
    if (tb == Py_None) {
        tb = 0;
    } else if (tb && !PyTraceBack_Check(tb)) {
        PyErr_SetString(PyExc_TypeError,
            "raise: arg 3 must be a traceback or None");
        goto bad;
    }
    if (value == Py_None)
        value = 0;
    if (PyExceptionInstance_Check(type)) {
        if (value) {
            PyErr_SetString(PyExc_TypeError,
                "instance exception may not have a separate value");
            goto bad;
        }
        value = type;
        type = (PyObject*) Py_TYPE(value);
    } else if (PyExceptionClass_Check(type)) {
        PyObject *args;
        if (!value)
            args = PyTuple_New(0);
        else if (PyTuple_Check(value)) {
            Py_INCREF(value);
            args = value;
        }
        else
            args = PyTuple_Pack(1, value);
        if (!args)
            goto bad;
        owned_instance = PyEval_CallObject(type, args);
        Py_DECREF(args);
        if (!owned_instance)
            goto bad;
        value = owned_instance;
        if (!PyExceptionInstance_Check(value)) {
            PyErr_Format(PyExc_TypeError,
                         "calling %R should have returned an instance of "
                         "BaseException, not %R",
                         type, Py_TYPE(value));
            goto bad;
        }
    } else {
        PyErr_SetString(PyExc_TypeError,
            "raise: exception class must be a subclass of BaseException");
        goto bad;
    }
    if (cause && cause != Py_None) {
        PyObject *fixed_cause;
        if (PyExceptionClass_Check(cause)) {
            fixed_cause = PyObject_CallObject(cause, NULL);
            if (fixed_cause == NULL)
                goto bad;
        }
        else if (PyExceptionInstance_Check(cause)) {
            fixed_cause = cause;
            Py_INCREF(fixed_cause);
        }
        else {
            PyErr_SetString(PyExc_TypeError,
                            "exception causes must derive from "
                            "BaseException");
            goto bad;
        }
        PyException_SetCause(value, fixed_cause);
    }
    PyErr_SetObject(type, value);
    if (tb) {
        PyThreadState *tstate = PyThreadState_GET();
        PyObject* tmp_tb = tstate->curexc_traceback;
        if (tb != tmp_tb) {
            Py_INCREF(tb);
            tstate->curexc_traceback = tb;
            Py_XDECREF(tmp_tb);
        }
    }
bad:
    Py_XDECREF(owned_instance);
    return;
}
#endif

static CYTHON_INLINE unsigned char __Pyx_PyInt_AsUnsignedChar(PyObject* x) {
    const unsigned char neg_one = (unsigned char)-1, const_zero = 0;
    const int is_unsigned = neg_one > const_zero;
    if (sizeof(unsigned char) < sizeof(long)) {
        long val = __Pyx_PyInt_AsLong(x);
        if (unlikely(val != (long)(unsigned char)val)) {
            if (!unlikely(val == -1 && PyErr_Occurred())) {
                PyErr_SetString(PyExc_OverflowError,
                    (is_unsigned && unlikely(val < 0)) ?
                    "can't convert negative value to unsigned char" :
                    "value too large to convert to unsigned char");
            }
            return (unsigned char)-1;
        }
        return (unsigned char)val;
    }
    return (unsigned char)__Pyx_PyInt_AsUnsignedLong(x);
}

static CYTHON_INLINE unsigned short __Pyx_PyInt_AsUnsignedShort(PyObject* x) {
    const unsigned short neg_one = (unsigned short)-1, const_zero = 0;
    const int is_unsigned = neg_one > const_zero;
    if (sizeof(unsigned short) < sizeof(long)) {
        long val = __Pyx_PyInt_AsLong(x);
        if (unlikely(val != (long)(unsigned short)val)) {
            if (!unlikely(val == -1 && PyErr_Occurred())) {
                PyErr_SetString(PyExc_OverflowError,
                    (is_unsigned && unlikely(val < 0)) ?
                    "can't convert negative value to unsigned short" :
                    "value too large to convert to unsigned short");
            }
            return (unsigned short)-1;
        }
        return (unsigned short)val;
    }
    return (unsigned short)__Pyx_PyInt_AsUnsignedLong(x);
}

static CYTHON_INLINE unsigned int __Pyx_PyInt_AsUnsignedInt(PyObject* x) {
    const unsigned int neg_one = (unsigned int)-1, const_zero = 0;
    const int is_unsigned = neg_one > const_zero;
    if (sizeof(unsigned int) < sizeof(long)) {
        long val = __Pyx_PyInt_AsLong(x);
        if (unlikely(val != (long)(unsigned int)val)) {
            if (!unlikely(val == -1 && PyErr_Occurred())) {
                PyErr_SetString(PyExc_OverflowError,
                    (is_unsigned && unlikely(val < 0)) ?
                    "can't convert negative value to unsigned int" :
                    "value too large to convert to unsigned int");
            }
            return (unsigned int)-1;
        }
        return (unsigned int)val;
    }
    return (unsigned int)__Pyx_PyInt_AsUnsignedLong(x);
}

static CYTHON_INLINE char __Pyx_PyInt_AsChar(PyObject* x) {
    const char neg_one = (char)-1, const_zero = 0;
    const int is_unsigned = neg_one > const_zero;
    if (sizeof(char) < sizeof(long)) {
        long val = __Pyx_PyInt_AsLong(x);
        if (unlikely(val != (long)(char)val)) {
            if (!unlikely(val == -1 && PyErr_Occurred())) {
                PyErr_SetString(PyExc_OverflowError,
                    (is_unsigned && unlikely(val < 0)) ?
                    "can't convert negative value to char" :
                    "value too large to convert to char");
            }
            return (char)-1;
        }
        return (char)val;
    }
    return (char)__Pyx_PyInt_AsLong(x);
}

static CYTHON_INLINE short __Pyx_PyInt_AsShort(PyObject* x) {
    const short neg_one = (short)-1, const_zero = 0;
    const int is_unsigned = neg_one > const_zero;
    if (sizeof(short) < sizeof(long)) {
        long val = __Pyx_PyInt_AsLong(x);
        if (unlikely(val != (long)(short)val)) {
            if (!unlikely(val == -1 && PyErr_Occurred())) {
                PyErr_SetString(PyExc_OverflowError,
                    (is_unsigned && unlikely(val < 0)) ?
                    "can't convert negative value to short" :
                    "value too large to convert to short");
            }
            return (short)-1;
        }
        return (short)val;
    }
    return (short)__Pyx_PyInt_AsLong(x);
}

static CYTHON_INLINE int __Pyx_PyInt_AsInt(PyObject* x) {
    const int neg_one = (int)-1, const_zero = 0;
    const int is_unsigned = neg_one > const_zero;
    if (sizeof(int) < sizeof(long)) {
        long val = __Pyx_PyInt_AsLong(x);
        if (unlikely(val != (long)(int)val)) {
            if (!unlikely(val == -1 && PyErr_Occurred())) {
                PyErr_SetString(PyExc_OverflowError,
                    (is_unsigned && unlikely(val < 0)) ?
                    "can't convert negative value to int" :
                    "value too large to convert to int");
            }
            return (int)-1;
        }
        return (int)val;
    }
    return (int)__Pyx_PyInt_AsLong(x);
}

static CYTHON_INLINE signed char __Pyx_PyInt_AsSignedChar(PyObject* x) {
    const signed char neg_one = (signed char)-1, const_zero = 0;
    const int is_unsigned = neg_one > const_zero;
    if (sizeof(signed char) < sizeof(long)) {
        long val = __Pyx_PyInt_AsLong(x);
        if (unlikely(val != (long)(signed char)val)) {
            if (!unlikely(val == -1 && PyErr_Occurred())) {
                PyErr_SetString(PyExc_OverflowError,
                    (is_unsigned && unlikely(val < 0)) ?
                    "can't convert negative value to signed char" :
                    "value too large to convert to signed char");
            }
            return (signed char)-1;
        }
        return (signed char)val;
    }
    return (signed char)__Pyx_PyInt_AsSignedLong(x);
}

static CYTHON_INLINE signed short __Pyx_PyInt_AsSignedShort(PyObject* x) {
    const signed short neg_one = (signed short)-1, const_zero = 0;
    const int is_unsigned = neg_one > const_zero;
    if (sizeof(signed short) < sizeof(long)) {
        long val = __Pyx_PyInt_AsLong(x);
        if (unlikely(val != (long)(signed short)val)) {
            if (!unlikely(val == -1 && PyErr_Occurred())) {
                PyErr_SetString(PyExc_OverflowError,
                    (is_unsigned && unlikely(val < 0)) ?
                    "can't convert negative value to signed short" :
                    "value too large to convert to signed short");
            }
            return (signed short)-1;
        }
        return (signed short)val;
    }
    return (signed short)__Pyx_PyInt_AsSignedLong(x);
}

static CYTHON_INLINE signed int __Pyx_PyInt_AsSignedInt(PyObject* x) {
    const signed int neg_one = (signed int)-1, const_zero = 0;
    const int is_unsigned = neg_one > const_zero;
    if (sizeof(signed int) < sizeof(long)) {
        long val = __Pyx_PyInt_AsLong(x);
        if (unlikely(val != (long)(signed int)val)) {
            if (!unlikely(val == -1 && PyErr_Occurred())) {
                PyErr_SetString(PyExc_OverflowError,
                    (is_unsigned && unlikely(val < 0)) ?
                    "can't convert negative value to signed int" :
                    "value too large to convert to signed int");
            }
            return (signed int)-1;
        }
        return (signed int)val;
    }
    return (signed int)__Pyx_PyInt_AsSignedLong(x);
}

static CYTHON_INLINE int __Pyx_PyInt_AsLongDouble(PyObject* x) {
    const int neg_one = (int)-1, const_zero = 0;
    const int is_unsigned = neg_one > const_zero;
    if (sizeof(int) < sizeof(long)) {
        long val = __Pyx_PyInt_AsLong(x);
        if (unlikely(val != (long)(int)val)) {
            if (!unlikely(val == -1 && PyErr_Occurred())) {
                PyErr_SetString(PyExc_OverflowError,
                    (is_unsigned && unlikely(val < 0)) ?
                    "can't convert negative value to int" :
                    "value too large to convert to int");
            }
            return (int)-1;
        }
        return (int)val;
    }
    return (int)__Pyx_PyInt_AsLong(x);
}

static CYTHON_INLINE unsigned long __Pyx_PyInt_AsUnsignedLong(PyObject* x) {
    const unsigned long neg_one = (unsigned long)-1, const_zero = 0;
    const int is_unsigned = neg_one > const_zero;
#if PY_VERSION_HEX < 0x03000000
    if (likely(PyInt_Check(x))) {
        long val = PyInt_AS_LONG(x);
        if (is_unsigned && unlikely(val < 0)) {
            PyErr_SetString(PyExc_OverflowError,
                            "can't convert negative value to unsigned long");
            return (unsigned long)-1;
        }
        return (unsigned long)val;
    } else
#endif
    if (likely(PyLong_Check(x))) {
        if (is_unsigned) {
            if (unlikely(Py_SIZE(x) < 0)) {
                PyErr_SetString(PyExc_OverflowError,
                                "can't convert negative value to unsigned long");
                return (unsigned long)-1;
            }
            return (unsigned long)PyLong_AsUnsignedLong(x);
        } else {
            return (unsigned long)PyLong_AsLong(x);
        }
    } else {
        unsigned long val;
        PyObject *tmp = __Pyx_PyNumber_Int(x);
        if (!tmp) return (unsigned long)-1;
        val = __Pyx_PyInt_AsUnsignedLong(tmp);
        Py_DECREF(tmp);
        return val;
    }
}

static CYTHON_INLINE unsigned PY_LONG_LONG __Pyx_PyInt_AsUnsignedLongLong(PyObject* x) {
    const unsigned PY_LONG_LONG neg_one = (unsigned PY_LONG_LONG)-1, const_zero = 0;
    const int is_unsigned = neg_one > const_zero;
#if PY_VERSION_HEX < 0x03000000
    if (likely(PyInt_Check(x))) {
        long val = PyInt_AS_LONG(x);
        if (is_unsigned && unlikely(val < 0)) {
            PyErr_SetString(PyExc_OverflowError,
                            "can't convert negative value to unsigned PY_LONG_LONG");
            return (unsigned PY_LONG_LONG)-1;
        }
        return (unsigned PY_LONG_LONG)val;
    } else
#endif
    if (likely(PyLong_Check(x))) {
        if (is_unsigned) {
            if (unlikely(Py_SIZE(x) < 0)) {
                PyErr_SetString(PyExc_OverflowError,
                                "can't convert negative value to unsigned PY_LONG_LONG");
                return (unsigned PY_LONG_LONG)-1;
            }
            return (unsigned PY_LONG_LONG)PyLong_AsUnsignedLongLong(x);
        } else {
            return (unsigned PY_LONG_LONG)PyLong_AsLongLong(x);
        }
    } else {
        unsigned PY_LONG_LONG val;
        PyObject *tmp = __Pyx_PyNumber_Int(x);
        if (!tmp) return (unsigned PY_LONG_LONG)-1;
        val = __Pyx_PyInt_AsUnsignedLongLong(tmp);
        Py_DECREF(tmp);
        return val;
    }
}

static CYTHON_INLINE long __Pyx_PyInt_AsLong(PyObject* x) {
    const long neg_one = (long)-1, const_zero = 0;
    const int is_unsigned = neg_one > const_zero;
#if PY_VERSION_HEX < 0x03000000
    if (likely(PyInt_Check(x))) {
        long val = PyInt_AS_LONG(x);
        if (is_unsigned && unlikely(val < 0)) {
            PyErr_SetString(PyExc_OverflowError,
                            "can't convert negative value to long");
            return (long)-1;
        }
        return (long)val;
    } else
#endif
    if (likely(PyLong_Check(x))) {
        if (is_unsigned) {
            if (unlikely(Py_SIZE(x) < 0)) {
                PyErr_SetString(PyExc_OverflowError,
                                "can't convert negative value to long");
                return (long)-1;
            }
            return (long)PyLong_AsUnsignedLong(x);
        } else {
            return (long)PyLong_AsLong(x);
        }
    } else {
        long val;
        PyObject *tmp = __Pyx_PyNumber_Int(x);
        if (!tmp) return (long)-1;
        val = __Pyx_PyInt_AsLong(tmp);
        Py_DECREF(tmp);
        return val;
    }
}

static CYTHON_INLINE PY_LONG_LONG __Pyx_PyInt_AsLongLong(PyObject* x) {
    const PY_LONG_LONG neg_one = (PY_LONG_LONG)-1, const_zero = 0;
    const int is_unsigned = neg_one > const_zero;
#if PY_VERSION_HEX < 0x03000000
    if (likely(PyInt_Check(x))) {
        long val = PyInt_AS_LONG(x);
        if (is_unsigned && unlikely(val < 0)) {
            PyErr_SetString(PyExc_OverflowError,
                            "can't convert negative value to PY_LONG_LONG");
            return (PY_LONG_LONG)-1;
        }
        return (PY_LONG_LONG)val;
    } else
#endif
    if (likely(PyLong_Check(x))) {
        if (is_unsigned) {
            if (unlikely(Py_SIZE(x) < 0)) {
                PyErr_SetString(PyExc_OverflowError,
                                "can't convert negative value to PY_LONG_LONG");
                return (PY_LONG_LONG)-1;
            }
            return (PY_LONG_LONG)PyLong_AsUnsignedLongLong(x);
        } else {
            return (PY_LONG_LONG)PyLong_AsLongLong(x);
        }
    } else {
        PY_LONG_LONG val;
        PyObject *tmp = __Pyx_PyNumber_Int(x);
        if (!tmp) return (PY_LONG_LONG)-1;
        val = __Pyx_PyInt_AsLongLong(tmp);
        Py_DECREF(tmp);
        return val;
    }
}

static CYTHON_INLINE signed long __Pyx_PyInt_AsSignedLong(PyObject* x) {
    const signed long neg_one = (signed long)-1, const_zero = 0;
    const int is_unsigned = neg_one > const_zero;
#if PY_VERSION_HEX < 0x03000000
    if (likely(PyInt_Check(x))) {
        long val = PyInt_AS_LONG(x);
        if (is_unsigned && unlikely(val < 0)) {
            PyErr_SetString(PyExc_OverflowError,
                            "can't convert negative value to signed long");
            return (signed long)-1;
        }
        return (signed long)val;
    } else
#endif
    if (likely(PyLong_Check(x))) {
        if (is_unsigned) {
            if (unlikely(Py_SIZE(x) < 0)) {
                PyErr_SetString(PyExc_OverflowError,
                                "can't convert negative value to signed long");
                return (signed long)-1;
            }
            return (signed long)PyLong_AsUnsignedLong(x);
        } else {
            return (signed long)PyLong_AsLong(x);
        }
    } else {
        signed long val;
        PyObject *tmp = __Pyx_PyNumber_Int(x);
        if (!tmp) return (signed long)-1;
        val = __Pyx_PyInt_AsSignedLong(tmp);
        Py_DECREF(tmp);
        return val;
    }
}

static CYTHON_INLINE signed PY_LONG_LONG __Pyx_PyInt_AsSignedLongLong(PyObject* x) {
    const signed PY_LONG_LONG neg_one = (signed PY_LONG_LONG)-1, const_zero = 0;
    const int is_unsigned = neg_one > const_zero;
#if PY_VERSION_HEX < 0x03000000
    if (likely(PyInt_Check(x))) {
        long val = PyInt_AS_LONG(x);
        if (is_unsigned && unlikely(val < 0)) {
            PyErr_SetString(PyExc_OverflowError,
                            "can't convert negative value to signed PY_LONG_LONG");
            return (signed PY_LONG_LONG)-1;
        }
        return (signed PY_LONG_LONG)val;
    } else
#endif
    if (likely(PyLong_Check(x))) {
        if (is_unsigned) {
            if (unlikely(Py_SIZE(x) < 0)) {
                PyErr_SetString(PyExc_OverflowError,
                                "can't convert negative value to signed PY_LONG_LONG");
                return (signed PY_LONG_LONG)-1;
            }
            return (signed PY_LONG_LONG)PyLong_AsUnsignedLongLong(x);
        } else {
            return (signed PY_LONG_LONG)PyLong_AsLongLong(x);
        }
    } else {
        signed PY_LONG_LONG val;
        PyObject *tmp = __Pyx_PyNumber_Int(x);
        if (!tmp) return (signed PY_LONG_LONG)-1;
        val = __Pyx_PyInt_AsSignedLongLong(tmp);
        Py_DECREF(tmp);
        return val;
    }
}

static void __Pyx_WriteUnraisable(const char *name, CYTHON_UNUSED int clineno,
                                  CYTHON_UNUSED int lineno, CYTHON_UNUSED const char *filename) {
    PyObject *old_exc, *old_val, *old_tb;
    PyObject *ctx;
    __Pyx_ErrFetch(&old_exc, &old_val, &old_tb);
    #if PY_MAJOR_VERSION < 3
    ctx = PyString_FromString(name);
    #else
    ctx = PyUnicode_FromString(name);
    #endif
    __Pyx_ErrRestore(old_exc, old_val, old_tb);
    if (!ctx) {
        PyErr_WriteUnraisable(Py_None);
    } else {
        PyErr_WriteUnraisable(ctx);
        Py_DECREF(ctx);
    }
}

static int __Pyx_check_binary_version(void) {
    char ctversion[4], rtversion[4];
    PyOS_snprintf(ctversion, 4, "%d.%d", PY_MAJOR_VERSION, PY_MINOR_VERSION);
    PyOS_snprintf(rtversion, 4, "%s", Py_GetVersion());
    if (ctversion[0] != rtversion[0] || ctversion[2] != rtversion[2]) {
        char message[200];
        PyOS_snprintf(message, sizeof(message),
                      "compiletime version %s of module '%.100s' "
                      "does not match runtime version %s",
                      ctversion, __Pyx_MODULE_NAME, rtversion);
        #if PY_VERSION_HEX < 0x02050000
        return PyErr_Warn(NULL, message);
        #else
        return PyErr_WarnEx(NULL, message, 1);
        #endif
    }
    return 0;
}

static int __Pyx_SetVtable(PyObject *dict, void *vtable) {
#if PY_VERSION_HEX >= 0x02070000 && !(PY_MAJOR_VERSION==3&&PY_MINOR_VERSION==0)
    PyObject *ob = PyCapsule_New(vtable, 0, 0);
#else
    PyObject *ob = PyCObject_FromVoidPtr(vtable, 0);
#endif
    if (!ob)
        goto bad;
    if (PyDict_SetItemString(dict, "__pyx_vtable__", ob) < 0)
        goto bad;
    Py_DECREF(ob);
    return 0;
bad:
    Py_XDECREF(ob);
    return -1;
}

static int __pyx_bisect_code_objects(__Pyx_CodeObjectCacheEntry* entries, int count, int code_line) {
    int start = 0, mid = 0, end = count - 1;
    if (end >= 0 && code_line > entries[end].code_line) {
        return count;
    }
    while (start < end) {
        mid = (start + end) / 2;
        if (code_line < entries[mid].code_line) {
            end = mid;
        } else if (code_line > entries[mid].code_line) {
             start = mid + 1;
        } else {
            return mid;
        }
    }
    if (code_line <= entries[mid].code_line) {
        return mid;
    } else {
        return mid + 1;
    }
}
static PyCodeObject *__pyx_find_code_object(int code_line) {
    PyCodeObject* code_object;
    int pos;
    if (unlikely(!code_line) || unlikely(!__pyx_code_cache.entries)) {
        return NULL;
    }
    pos = __pyx_bisect_code_objects(__pyx_code_cache.entries, __pyx_code_cache.count, code_line);
    if (unlikely(pos >= __pyx_code_cache.count) || unlikely(__pyx_code_cache.entries[pos].code_line != code_line)) {
        return NULL;
    }
    code_object = __pyx_code_cache.entries[pos].code_object;
    Py_INCREF(code_object);
    return code_object;
}
static void __pyx_insert_code_object(int code_line, PyCodeObject* code_object) {
    int pos, i;
    __Pyx_CodeObjectCacheEntry* entries = __pyx_code_cache.entries;
    if (unlikely(!code_line)) {
        return;
    }
    if (unlikely(!entries)) {
        entries = (__Pyx_CodeObjectCacheEntry*)PyMem_Malloc(64*sizeof(__Pyx_CodeObjectCacheEntry));
        if (likely(entries)) {
            __pyx_code_cache.entries = entries;
            __pyx_code_cache.max_count = 64;
            __pyx_code_cache.count = 1;
            entries[0].code_line = code_line;
            entries[0].code_object = code_object;
            Py_INCREF(code_object);
        }
        return;
    }
    pos = __pyx_bisect_code_objects(__pyx_code_cache.entries, __pyx_code_cache.count, code_line);
    if ((pos < __pyx_code_cache.count) && unlikely(__pyx_code_cache.entries[pos].code_line == code_line)) {
        PyCodeObject* tmp = entries[pos].code_object;
        entries[pos].code_object = code_object;
        Py_DECREF(tmp);
        return;
    }
    if (__pyx_code_cache.count == __pyx_code_cache.max_count) {
        int new_max = __pyx_code_cache.max_count + 64;
        entries = (__Pyx_CodeObjectCacheEntry*)PyMem_Realloc(
            __pyx_code_cache.entries, new_max*sizeof(__Pyx_CodeObjectCacheEntry));
        if (unlikely(!entries)) {
            return;
        }
        __pyx_code_cache.entries = entries;
        __pyx_code_cache.max_count = new_max;
    }
    for (i=__pyx_code_cache.count; i>pos; i--) {
        entries[i] = entries[i-1];
    }
    entries[pos].code_line = code_line;
    entries[pos].code_object = code_object;
    __pyx_code_cache.count++;
    Py_INCREF(code_object);
}

#include "compile.h"
#include "frameobject.h"
#include "traceback.h"
static PyCodeObject* __Pyx_CreateCodeObjectForTraceback(
            const char *funcname, int c_line,
            int py_line, const char *filename) {
    PyCodeObject *py_code = 0;
    PyObject *py_srcfile = 0;
    PyObject *py_funcname = 0;
    #if PY_MAJOR_VERSION < 3
    py_srcfile = PyString_FromString(filename);
    #else
    py_srcfile = PyUnicode_FromString(filename);
    #endif
    if (!py_srcfile) goto bad;
    if (c_line) {
        #if PY_MAJOR_VERSION < 3
        py_funcname = PyString_FromFormat( "%s (%s:%d)", funcname, __pyx_cfilenm, c_line);
        #else
        py_funcname = PyUnicode_FromFormat( "%s (%s:%d)", funcname, __pyx_cfilenm, c_line);
        #endif
    }
    else {
        #if PY_MAJOR_VERSION < 3
        py_funcname = PyString_FromString(funcname);
        #else
        py_funcname = PyUnicode_FromString(funcname);
        #endif
    }
    if (!py_funcname) goto bad;
    py_code = __Pyx_PyCode_New(
        0,            /*int argcount,*/
        0,            /*int kwonlyargcount,*/
        0,            /*int nlocals,*/
        0,            /*int stacksize,*/
        0,            /*int flags,*/
        __pyx_empty_bytes, /*PyObject *code,*/
        __pyx_empty_tuple, /*PyObject *consts,*/
        __pyx_empty_tuple, /*PyObject *names,*/
        __pyx_empty_tuple, /*PyObject *varnames,*/
        __pyx_empty_tuple, /*PyObject *freevars,*/
        __pyx_empty_tuple, /*PyObject *cellvars,*/
        py_srcfile,   /*PyObject *filename,*/
        py_funcname,  /*PyObject *name,*/
        py_line,      /*int firstlineno,*/
        __pyx_empty_bytes  /*PyObject *lnotab*/
    );
    Py_DECREF(py_srcfile);
    Py_DECREF(py_funcname);
    return py_code;
bad:
    Py_XDECREF(py_srcfile);
    Py_XDECREF(py_funcname);
    return NULL;
}
static void __Pyx_AddTraceback(const char *funcname, int c_line,
                               int py_line, const char *filename) {
    PyCodeObject *py_code = 0;
    PyObject *py_globals = 0;
    PyFrameObject *py_frame = 0;
    py_code = __pyx_find_code_object(c_line ? c_line : py_line);
    if (!py_code) {
        py_code = __Pyx_CreateCodeObjectForTraceback(
            funcname, c_line, py_line, filename);
        if (!py_code) goto bad;
        __pyx_insert_code_object(c_line ? c_line : py_line, py_code);
    }
    py_globals = PyModule_GetDict(__pyx_m);
    if (!py_globals) goto bad;
    py_frame = PyFrame_New(
        PyThreadState_GET(), /*PyThreadState *tstate,*/
        py_code,             /*PyCodeObject *code,*/
        py_globals,          /*PyObject *globals,*/
        0                    /*PyObject *locals*/
    );
    if (!py_frame) goto bad;
    py_frame->f_lineno = py_line;
    PyTraceBack_Here(py_frame);
bad:
    Py_XDECREF(py_code);
    Py_XDECREF(py_frame);
}

static int __Pyx_InitStrings(__Pyx_StringTabEntry *t) {
    while (t->p) {
        #if PY_MAJOR_VERSION < 3
        if (t->is_unicode) {
            *t->p = PyUnicode_DecodeUTF8(t->s, t->n - 1, NULL);
        } else if (t->intern) {
            *t->p = PyString_InternFromString(t->s);
        } else {
            *t->p = PyString_FromStringAndSize(t->s, t->n - 1);
        }
        #else  /* Python 3+ has unicode identifiers */
        if (t->is_unicode | t->is_str) {
            if (t->intern) {
                *t->p = PyUnicode_InternFromString(t->s);
            } else if (t->encoding) {
                *t->p = PyUnicode_Decode(t->s, t->n - 1, t->encoding, NULL);
            } else {
                *t->p = PyUnicode_FromStringAndSize(t->s, t->n - 1);
            }
        } else {
            *t->p = PyBytes_FromStringAndSize(t->s, t->n - 1);
        }
        #endif
        if (!*t->p)
            return -1;
        ++t;
    }
    return 0;
}


/* Type Conversion Functions */

static CYTHON_INLINE int __Pyx_PyObject_IsTrue(PyObject* x) {
   int is_true = x == Py_True;
   if (is_true | (x == Py_False) | (x == Py_None)) return is_true;
   else return PyObject_IsTrue(x);
}

static CYTHON_INLINE PyObject* __Pyx_PyNumber_Int(PyObject* x) {
  PyNumberMethods *m;
  const char *name = NULL;
  PyObject *res = NULL;
#if PY_VERSION_HEX < 0x03000000
  if (PyInt_Check(x) || PyLong_Check(x))
#else
  if (PyLong_Check(x))
#endif
    return Py_INCREF(x), x;
  m = Py_TYPE(x)->tp_as_number;
#if PY_VERSION_HEX < 0x03000000
  if (m && m->nb_int) {
    name = "int";
    res = PyNumber_Int(x);
  }
  else if (m && m->nb_long) {
    name = "long";
    res = PyNumber_Long(x);
  }
#else
  if (m && m->nb_int) {
    name = "int";
    res = PyNumber_Long(x);
  }
#endif
  if (res) {
#if PY_VERSION_HEX < 0x03000000
    if (!PyInt_Check(res) && !PyLong_Check(res)) {
#else
    if (!PyLong_Check(res)) {
#endif
      PyErr_Format(PyExc_TypeError,
                   "__%s__ returned non-%s (type %.200s)",
                   name, name, Py_TYPE(res)->tp_name);
      Py_DECREF(res);
      return NULL;
    }
  }
  else if (!PyErr_Occurred()) {
    PyErr_SetString(PyExc_TypeError,
                    "an integer is required");
  }
  return res;
}

static CYTHON_INLINE Py_ssize_t __Pyx_PyIndex_AsSsize_t(PyObject* b) {
  Py_ssize_t ival;
  PyObject* x = PyNumber_Index(b);
  if (!x) return -1;
  ival = PyInt_AsSsize_t(x);
  Py_DECREF(x);
  return ival;
}

static CYTHON_INLINE PyObject * __Pyx_PyInt_FromSize_t(size_t ival) {
#if PY_VERSION_HEX < 0x02050000
   if (ival <= LONG_MAX)
       return PyInt_FromLong((long)ival);
   else {
       unsigned char *bytes = (unsigned char *) &ival;
       int one = 1; int little = (int)*(unsigned char*)&one;
       return _PyLong_FromByteArray(bytes, sizeof(size_t), little, 0);
   }
#else
   return PyInt_FromSize_t(ival);
#endif
}

static CYTHON_INLINE size_t __Pyx_PyInt_AsSize_t(PyObject* x) {
   unsigned PY_LONG_LONG val = __Pyx_PyInt_AsUnsignedLongLong(x);
   if (unlikely(val == (unsigned PY_LONG_LONG)-1 && PyErr_Occurred())) {
       return (size_t)-1;
   } else if (unlikely(val != (unsigned PY_LONG_LONG)(size_t)val)) {
       PyErr_SetString(PyExc_OverflowError,
                       "value too large to convert to size_t");
       return (size_t)-1;
   }
   return (size_t)val;
}


#endif /* Py_PYTHON_H */