StaticAssert.h revision c981c48f5bc9aefeffc0bcb0cc3934c2fae179dd 
1// This file is part of Eigen, a lightweight C++ template library
2// for linear algebra.
3//
4// Copyright (C) 2008 Gael Guennebaud <gael.guennebaud@inria.fr>
5// Copyright (C) 2008 Benoit Jacob <jacob.benoit.1@gmail.com>
6//
7// This Source Code Form is subject to the terms of the Mozilla
8// Public License v. 2.0. If a copy of the MPL was not distributed
9// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
10
11#ifndef EIGEN_STATIC_ASSERT_H
12#define EIGEN_STATIC_ASSERT_H
13
14/* Some notes on Eigen's static assertion mechanism:
15 *
16 *  - in EIGEN_STATIC_ASSERT(CONDITION,MSG) the parameter CONDITION must be a compile time boolean
17 *    expression, and MSG an enum listed in struct internal::static_assertion<true>
18 *
19 *  - define EIGEN_NO_STATIC_ASSERT to disable them (and save compilation time)
20 *    in that case, the static assertion is converted to the following runtime assert:
21 *      eigen_assert(CONDITION && "MSG")
22 *
23 *  - currently EIGEN_STATIC_ASSERT can only be used in function scope
24 *
25 */
26
27#ifndef EIGEN_NO_STATIC_ASSERT
28
29  #if defined(__GXX_EXPERIMENTAL_CXX0X__) || (defined(_MSC_VER) && (_MSC_VER >= 1600))
30
31    // if native static_assert is enabled, let's use it
32    #define EIGEN_STATIC_ASSERT(X,MSG) static_assert(X,#MSG);
33
34  #else // not CXX0X
35
36    namespace Eigen {
37
38    namespace internal {
39
40    template<bool condition>
41    struct static_assertion {};
42
43    template<>
44    struct static_assertion<true>
45    {
46      enum {
47        YOU_TRIED_CALLING_A_VECTOR_METHOD_ON_A_MATRIX,
48        YOU_MIXED_VECTORS_OF_DIFFERENT_SIZES,
49        YOU_MIXED_MATRICES_OF_DIFFERENT_SIZES,
50        THIS_METHOD_IS_ONLY_FOR_VECTORS_OF_A_SPECIFIC_SIZE,
51        THIS_METHOD_IS_ONLY_FOR_MATRICES_OF_A_SPECIFIC_SIZE,
52        THIS_METHOD_IS_ONLY_FOR_OBJECTS_OF_A_SPECIFIC_SIZE,
53        YOU_MADE_A_PROGRAMMING_MISTAKE,
54        EIGEN_INTERNAL_ERROR_PLEASE_FILE_A_BUG_REPORT,
55        EIGEN_INTERNAL_COMPILATION_ERROR_OR_YOU_MADE_A_PROGRAMMING_MISTAKE,
56        YOU_CALLED_A_FIXED_SIZE_METHOD_ON_A_DYNAMIC_SIZE_MATRIX_OR_VECTOR,
57        YOU_CALLED_A_DYNAMIC_SIZE_METHOD_ON_A_FIXED_SIZE_MATRIX_OR_VECTOR,
58        UNALIGNED_LOAD_AND_STORE_OPERATIONS_UNIMPLEMENTED_ON_ALTIVEC,
59        THIS_FUNCTION_IS_NOT_FOR_INTEGER_NUMERIC_TYPES,
60        FLOATING_POINT_ARGUMENT_PASSED__INTEGER_WAS_EXPECTED,
61        NUMERIC_TYPE_MUST_BE_REAL,
62        COEFFICIENT_WRITE_ACCESS_TO_SELFADJOINT_NOT_SUPPORTED,
63        WRITING_TO_TRIANGULAR_PART_WITH_UNIT_DIAGONAL_IS_NOT_SUPPORTED,
64        THIS_METHOD_IS_ONLY_FOR_FIXED_SIZE,
65        INVALID_MATRIX_PRODUCT,
66        INVALID_VECTOR_VECTOR_PRODUCT__IF_YOU_WANTED_A_DOT_OR_COEFF_WISE_PRODUCT_YOU_MUST_USE_THE_EXPLICIT_FUNCTIONS,
67        INVALID_MATRIX_PRODUCT__IF_YOU_WANTED_A_COEFF_WISE_PRODUCT_YOU_MUST_USE_THE_EXPLICIT_FUNCTION,
68        YOU_MIXED_DIFFERENT_NUMERIC_TYPES__YOU_NEED_TO_USE_THE_CAST_METHOD_OF_MATRIXBASE_TO_CAST_NUMERIC_TYPES_EXPLICITLY,
69        THIS_METHOD_IS_ONLY_FOR_COLUMN_MAJOR_MATRICES,
70        THIS_METHOD_IS_ONLY_FOR_ROW_MAJOR_MATRICES,
71        INVALID_MATRIX_TEMPLATE_PARAMETERS,
72        INVALID_MATRIXBASE_TEMPLATE_PARAMETERS,
73        BOTH_MATRICES_MUST_HAVE_THE_SAME_STORAGE_ORDER,
74        THIS_METHOD_IS_ONLY_FOR_DIAGONAL_MATRIX,
75        THE_MATRIX_OR_EXPRESSION_THAT_YOU_PASSED_DOES_NOT_HAVE_THE_EXPECTED_TYPE,
76        THIS_METHOD_IS_ONLY_FOR_EXPRESSIONS_WITH_DIRECT_MEMORY_ACCESS_SUCH_AS_MAP_OR_PLAIN_MATRICES,
77        YOU_ALREADY_SPECIFIED_THIS_STRIDE,
78        INVALID_STORAGE_ORDER_FOR_THIS_VECTOR_EXPRESSION,
79        THE_BRACKET_OPERATOR_IS_ONLY_FOR_VECTORS__USE_THE_PARENTHESIS_OPERATOR_INSTEAD,
80        PACKET_ACCESS_REQUIRES_TO_HAVE_INNER_STRIDE_FIXED_TO_1,
81        THIS_METHOD_IS_ONLY_FOR_SPECIFIC_TRANSFORMATIONS,
82        YOU_CANNOT_MIX_ARRAYS_AND_MATRICES,
83        YOU_PERFORMED_AN_INVALID_TRANSFORMATION_CONVERSION,
84        THIS_EXPRESSION_IS_NOT_A_LVALUE__IT_IS_READ_ONLY,
85        YOU_ARE_TRYING_TO_USE_AN_INDEX_BASED_ACCESSOR_ON_AN_EXPRESSION_THAT_DOES_NOT_SUPPORT_THAT,
86        THIS_METHOD_IS_ONLY_FOR_1x1_EXPRESSIONS,
87        THIS_METHOD_IS_ONLY_FOR_EXPRESSIONS_OF_BOOL,
88        THIS_METHOD_IS_ONLY_FOR_ARRAYS_NOT_MATRICES,
89        YOU_PASSED_A_ROW_VECTOR_BUT_A_COLUMN_VECTOR_WAS_EXPECTED,
90        YOU_PASSED_A_COLUMN_VECTOR_BUT_A_ROW_VECTOR_WAS_EXPECTED,
91        THE_INDEX_TYPE_MUST_BE_A_SIGNED_TYPE,
92        THE_STORAGE_ORDER_OF_BOTH_SIDES_MUST_MATCH
93      };
94    };
95
96    } // end namespace internal
97
98    } // end namespace Eigen
99
100    // Specialized implementation for MSVC to avoid "conditional
101    // expression is constant" warnings.  This implementation doesn't
102    // appear to work under GCC, hence the multiple implementations.
103    #ifdef _MSC_VER
104
105      #define EIGEN_STATIC_ASSERT(CONDITION,MSG) \
106        {Eigen::internal::static_assertion<bool(CONDITION)>::MSG;}
107
108    #else
109
110      #define EIGEN_STATIC_ASSERT(CONDITION,MSG) \
111        if (Eigen::internal::static_assertion<bool(CONDITION)>::MSG) {}
112
113    #endif
114
115  #endif // not CXX0X
116
117#else // EIGEN_NO_STATIC_ASSERT
118
119  #define EIGEN_STATIC_ASSERT(CONDITION,MSG) eigen_assert((CONDITION) && #MSG);
120
121#endif // EIGEN_NO_STATIC_ASSERT
122
123
124// static assertion failing if the type \a TYPE is not a vector type
125#define EIGEN_STATIC_ASSERT_VECTOR_ONLY(TYPE) \
126  EIGEN_STATIC_ASSERT(TYPE::IsVectorAtCompileTime, \
127                      YOU_TRIED_CALLING_A_VECTOR_METHOD_ON_A_MATRIX)
128
129// static assertion failing if the type \a TYPE is not fixed-size
130#define EIGEN_STATIC_ASSERT_FIXED_SIZE(TYPE) \
131  EIGEN_STATIC_ASSERT(TYPE::SizeAtCompileTime!=Eigen::Dynamic, \
132                      YOU_CALLED_A_FIXED_SIZE_METHOD_ON_A_DYNAMIC_SIZE_MATRIX_OR_VECTOR)
133
134// static assertion failing if the type \a TYPE is not dynamic-size
135#define EIGEN_STATIC_ASSERT_DYNAMIC_SIZE(TYPE) \
136  EIGEN_STATIC_ASSERT(TYPE::SizeAtCompileTime==Eigen::Dynamic, \
137                      YOU_CALLED_A_DYNAMIC_SIZE_METHOD_ON_A_FIXED_SIZE_MATRIX_OR_VECTOR)
138
139// static assertion failing if the type \a TYPE is not a vector type of the given size
140#define EIGEN_STATIC_ASSERT_VECTOR_SPECIFIC_SIZE(TYPE, SIZE) \
141  EIGEN_STATIC_ASSERT(TYPE::IsVectorAtCompileTime && TYPE::SizeAtCompileTime==SIZE, \
142                      THIS_METHOD_IS_ONLY_FOR_VECTORS_OF_A_SPECIFIC_SIZE)
143
144// static assertion failing if the type \a TYPE is not a vector type of the given size
145#define EIGEN_STATIC_ASSERT_MATRIX_SPECIFIC_SIZE(TYPE, ROWS, COLS) \
146  EIGEN_STATIC_ASSERT(TYPE::RowsAtCompileTime==ROWS && TYPE::ColsAtCompileTime==COLS, \
147                      THIS_METHOD_IS_ONLY_FOR_MATRICES_OF_A_SPECIFIC_SIZE)
148
149// static assertion failing if the two vector expression types are not compatible (same fixed-size or dynamic size)
150#define EIGEN_STATIC_ASSERT_SAME_VECTOR_SIZE(TYPE0,TYPE1) \
151  EIGEN_STATIC_ASSERT( \
152      (int(TYPE0::SizeAtCompileTime)==Eigen::Dynamic \
153    || int(TYPE1::SizeAtCompileTime)==Eigen::Dynamic \
154    || int(TYPE0::SizeAtCompileTime)==int(TYPE1::SizeAtCompileTime)),\
155    YOU_MIXED_VECTORS_OF_DIFFERENT_SIZES)
156
157#define EIGEN_PREDICATE_SAME_MATRIX_SIZE(TYPE0,TYPE1) \
158     ( \
159        (int(TYPE0::SizeAtCompileTime)==0 && int(TYPE1::SizeAtCompileTime)==0) \
160    || (\
161          (int(TYPE0::RowsAtCompileTime)==Eigen::Dynamic \
162        || int(TYPE1::RowsAtCompileTime)==Eigen::Dynamic \
163        || int(TYPE0::RowsAtCompileTime)==int(TYPE1::RowsAtCompileTime)) \
164      &&  (int(TYPE0::ColsAtCompileTime)==Eigen::Dynamic \
165        || int(TYPE1::ColsAtCompileTime)==Eigen::Dynamic \
166        || int(TYPE0::ColsAtCompileTime)==int(TYPE1::ColsAtCompileTime))\
167       ) \
168     )
169
170#ifdef EIGEN2_SUPPORT
171  #define EIGEN_STATIC_ASSERT_NON_INTEGER(TYPE) \
172    eigen_assert(!NumTraits<Scalar>::IsInteger);
173#else
174  #define EIGEN_STATIC_ASSERT_NON_INTEGER(TYPE) \
175    EIGEN_STATIC_ASSERT(!NumTraits<TYPE>::IsInteger, THIS_FUNCTION_IS_NOT_FOR_INTEGER_NUMERIC_TYPES)
176#endif
177
178
179// static assertion failing if it is guaranteed at compile-time that the two matrix expression types have different sizes
180#define EIGEN_STATIC_ASSERT_SAME_MATRIX_SIZE(TYPE0,TYPE1) \
181  EIGEN_STATIC_ASSERT( \
182     EIGEN_PREDICATE_SAME_MATRIX_SIZE(TYPE0,TYPE1),\
183    YOU_MIXED_MATRICES_OF_DIFFERENT_SIZES)
184
185#define EIGEN_STATIC_ASSERT_SIZE_1x1(TYPE) \
186      EIGEN_STATIC_ASSERT((TYPE::RowsAtCompileTime == 1 || TYPE::RowsAtCompileTime == Dynamic) && \
187                          (TYPE::ColsAtCompileTime == 1 || TYPE::ColsAtCompileTime == Dynamic), \
188                          THIS_METHOD_IS_ONLY_FOR_1x1_EXPRESSIONS)
189
190#define EIGEN_STATIC_ASSERT_LVALUE(Derived) \
191      EIGEN_STATIC_ASSERT(internal::is_lvalue<Derived>::value, \
192                          THIS_EXPRESSION_IS_NOT_A_LVALUE__IT_IS_READ_ONLY)
193
194#define EIGEN_STATIC_ASSERT_ARRAYXPR(Derived) \
195      EIGEN_STATIC_ASSERT((internal::is_same<typename internal::traits<Derived>::XprKind, ArrayXpr>::value), \
196                          THIS_METHOD_IS_ONLY_FOR_ARRAYS_NOT_MATRICES)
197
198#define EIGEN_STATIC_ASSERT_SAME_XPR_KIND(Derived1, Derived2) \
199      EIGEN_STATIC_ASSERT((internal::is_same<typename internal::traits<Derived1>::XprKind, \
200                                             typename internal::traits<Derived2>::XprKind \
201                                            >::value), \
202                          YOU_CANNOT_MIX_ARRAYS_AND_MATRICES)
203
204
205#endif // EIGEN_STATIC_ASSERT_H
206