_iterator_base.h revision e46c9386c4f79aa40185f79a19fc5b2a7ef528b3
1/* 2 * 3 * Copyright (c) 1994 4 * Hewlett-Packard Company 5 * 6 * Copyright (c) 1996-1998 7 * Silicon Graphics Computer Systems, Inc. 8 * 9 * Copyright (c) 1997 10 * Moscow Center for SPARC Technology 11 * 12 * Copyright (c) 1999 13 * Boris Fomitchev 14 * 15 * This material is provided "as is", with absolutely no warranty expressed 16 * or implied. Any use is at your own risk. 17 * 18 * Permission to use or copy this software for any purpose is hereby granted 19 * without fee, provided the above notices are retained on all copies. 20 * Permission to modify the code and to distribute modified code is granted, 21 * provided the above notices are retained, and a notice that the code was 22 * modified is included with the above copyright notice. 23 * 24 */ 25 26/* NOTE: This is an internal header file, included by other STL headers. 27 * You should not attempt to use it directly. 28 */ 29 30#ifndef _STLP_INTERNAL_ITERATOR_BASE_H 31#define _STLP_INTERNAL_ITERATOR_BASE_H 32 33#ifndef _STLP_INTERNAL_CSTDDEF 34# include <stl/_cstddef.h> 35#endif 36 37//# if defined (_STLP_IMPORT_VENDOR_CSTD) && ! defined (_STLP_VENDOR_GLOBAL_CSTD) 38//_STLP_BEGIN_NAMESPACE 39//using namespace _STLP_VENDOR_CSTD; 40//_STLP_END_NAMESPACE 41//#endif /* _STLP_IMPORT_VENDOR_CSTD */ 42 43#if !defined(_STLP_USE_OLD_HP_ITERATOR_QUERIES) && !defined(_STLP_CLASS_PARTIAL_SPECIALIZATION) 44# ifndef _STLP_TYPE_TRAITS_H 45# include <stl/type_traits.h> 46# endif 47#endif 48 49_STLP_BEGIN_NAMESPACE 50 51struct input_iterator_tag {}; 52struct output_iterator_tag {}; 53struct forward_iterator_tag : public input_iterator_tag {}; 54struct bidirectional_iterator_tag : public forward_iterator_tag {}; 55struct random_access_iterator_tag : public bidirectional_iterator_tag {}; 56 57template <class _Category, class _Tp, _STLP_DFL_TMPL_PARAM(_Distance,ptrdiff_t), 58 _STLP_DFL_TMPL_PARAM(_Pointer,_Tp*), _STLP_DFL_TMPL_PARAM(_Reference,_Tp&) > 59struct iterator { 60 typedef _Category iterator_category; 61 typedef _Tp value_type; 62 typedef _Distance difference_type; 63 typedef _Pointer pointer; 64 typedef _Reference reference; 65}; 66_STLP_TEMPLATE_NULL 67struct iterator<output_iterator_tag, void, void, void, void> { 68 typedef output_iterator_tag iterator_category; 69#ifdef _STLP_CLASS_PARTIAL_SPECIALIZATION 70 typedef void value_type; 71 typedef void difference_type; 72 typedef void pointer; 73 typedef void reference; 74#endif 75}; 76 77#if defined (_STLP_USE_OLD_HP_ITERATOR_QUERIES) 78# define _STLP_ITERATOR_CATEGORY(_It, _Tp) _STLP_STD::iterator_category(_It) 79# define _STLP_DISTANCE_TYPE(_It, _Tp) _STLP_STD::distance_type(_It) 80# define _STLP_VALUE_TYPE(_It, _Tp) _STLP_STD::value_type(_It) 81//Old HP iterator queries do not give information about the iterator 82//associated reference type so we consider that it is not a real reference. 83# define _STLP_IS_REF_TYPE_REAL_REF(_It, _Tp) __false_type() 84#else 85# if defined (_STLP_CLASS_PARTIAL_SPECIALIZATION) 86# define _STLP_VALUE_TYPE(_It, _Tp) (_STLP_TYPENAME _STLP_STD::iterator_traits< _Tp >::value_type*)0 87# define _STLP_DISTANCE_TYPE(_It, _Tp) (_STLP_TYPENAME _STLP_STD::iterator_traits< _Tp >::difference_type*)0 88# if defined (__BORLANDC__) || defined (__SUNPRO_CC) || ( defined (__MWERKS__) && (__MWERKS__ <= 0x2303)) || \ 89 (defined (__sgi) && defined (_COMPILER_VERSION)) || defined (__DMC__) 90# define _STLP_ITERATOR_CATEGORY(_It, _Tp) _STLP_STD::iterator_traits< _Tp >::iterator_category() 91# else 92# define _STLP_ITERATOR_CATEGORY(_It, _Tp) _STLP_TYPENAME _STLP_STD::iterator_traits< _Tp >::iterator_category() 93# endif 94# define _STLP_IS_REF_TYPE_REAL_REF(_It, _Tp) _STLP_STD::_IsRefType< _STLP_TYPENAME _STLP_STD::iterator_traits< _Tp >::reference >::_Ret() 95# else 96# define _STLP_ITERATOR_CATEGORY(_It, _Tp) _STLP_STD::__iterator_category(_It, _STLP_STD::_IsPtrType<_Tp>::_Ret()) 97# define _STLP_DISTANCE_TYPE(_It, _Tp) _STLP_STD::__distance_type(_It, _STLP_STD::_IsPtrType<_Tp>::_Ret()) 98# define _STLP_VALUE_TYPE(_It, _Tp) _STLP_STD::__value_type(_It, _STLP_STD::_IsPtrType<_Tp>::_Ret()) 99# define _STLP_IS_REF_TYPE_REAL_REF(_It, _Tp) __false_type() 100# endif 101#endif 102 103#if defined (_STLP_DONT_REDEFINE_STD) && defined (_STLP_WHOLE_NATIVE_STD) 104/* In this mode we will see both STLport implementation and native 105 * one. To allow some interaction between both implementations through 106 * iterators we have to map std iterator categories to stlport ones. This 107 * way we will be able to initialize STLport containers with native 108 * iterators, the other side won't work except when STLport iterators are 109 * simple pointers. */ 110 111_STLP_END_NAMESPACE 112 113# if defined (_STLP_HAS_INCLUDE_NEXT) 114# include_next <iterator> 115# else 116# include _STLP_NATIVE_HEADER(iterator) 117# endif 118 119_STLP_BEGIN_NAMESPACE 120 121template <class _IteCat> 122struct _CategoryMapping 123{ typedef _IteCat _Tag; }; 124 125_STLP_TEMPLATE_NULL 126struct _CategoryMapping<::std::input_iterator_tag> 127{ typedef input_iterator_tag _Tag; }; 128_STLP_TEMPLATE_NULL 129struct _CategoryMapping<::std::output_iterator_tag> 130{ typedef output_iterator_tag _Tag; }; 131_STLP_TEMPLATE_NULL 132struct _CategoryMapping<::std::forward_iterator_tag> 133{ typedef forward_iterator_tag _Tag; }; 134_STLP_TEMPLATE_NULL 135struct _CategoryMapping<::std::bidirectional_iterator_tag> 136{ typedef bidirectional_iterator_tag _Tag; }; 137_STLP_TEMPLATE_NULL 138struct _CategoryMapping<::std::random_access_iterator_tag> 139{ typedef random_access_iterator_tag _Tag; }; 140 141template <class _Iterator> 142struct iterator_traits { 143 typedef typename _Iterator::iterator_category _OriginalTag; 144 typedef typename _CategoryMapping<_OriginalTag>::_Tag iterator_category; 145#else 146template <class _Iterator> 147struct iterator_traits { 148 typedef typename _Iterator::iterator_category iterator_category; 149#endif 150 typedef typename _Iterator::value_type value_type; 151 typedef typename _Iterator::difference_type difference_type; 152 typedef typename _Iterator::pointer pointer; 153 typedef typename _Iterator::reference reference; 154}; 155 156#if defined (_STLP_CLASS_PARTIAL_SPECIALIZATION) && !defined (__SUNPRO_CC) 157# define _STLP_DIFFERENCE_TYPE(_Iterator) typename iterator_traits<_Iterator>::difference_type 158#else 159# define _STLP_DIFFERENCE_TYPE(_Iterator) ptrdiff_t 160#endif 161 162#ifdef _STLP_CLASS_PARTIAL_SPECIALIZATION 163 164// fbp : this order keeps gcc happy 165template <class _Tp> 166struct iterator_traits<const _Tp*> { 167 typedef random_access_iterator_tag iterator_category; 168 typedef _Tp value_type; 169 typedef ptrdiff_t difference_type; 170 typedef const _Tp* pointer; 171 typedef const _Tp& reference; 172}; 173 174template <class _Tp> 175struct iterator_traits<_Tp*> { 176 typedef random_access_iterator_tag iterator_category; 177 typedef _Tp value_type; 178 typedef ptrdiff_t difference_type; 179 typedef _Tp* pointer; 180 typedef _Tp& reference; 181}; 182 183# if defined (__BORLANDC__) 184template <class _Tp> 185struct iterator_traits<_Tp* const> { 186 typedef random_access_iterator_tag iterator_category; 187 typedef _Tp value_type; 188 typedef ptrdiff_t difference_type; 189 typedef const _Tp* pointer; 190 typedef const _Tp& reference; 191}; 192# endif 193 194#endif /* _STLP_CLASS_PARTIAL_SPECIALIZATION */ 195 196_STLP_END_NAMESPACE 197#include <stl/_ptrs_specialize.h> 198_STLP_BEGIN_NAMESPACE 199 200#ifndef _STLP_USE_OLD_HP_ITERATOR_QUERIES 201// The overloaded functions iterator_category, distance_type, and 202// value_type are not part of the C++ standard. (They have been 203// replaced by struct iterator_traits.) They are included for 204// backward compatibility with the HP STL. 205// We introduce internal names for these functions. 206 207# ifndef _STLP_CLASS_PARTIAL_SPECIALIZATION 208 209template <class _Tp> 210inline _STLP_STD::random_access_iterator_tag 211__iterator_category(const _Tp*, const __true_type&) 212{ return _STLP_STD::random_access_iterator_tag(); } 213 214template <class _Iter> 215inline _STLP_TYPENAME_ON_RETURN_TYPE _STLP_STD::iterator_traits<_Iter>::iterator_category 216__iterator_category(const _Iter&, const __false_type&) { 217 typedef _STLP_TYPENAME _STLP_STD::iterator_traits<_Iter>::iterator_category _Category; 218 return _Category(); 219} 220 221template <class _Tp> 222inline ptrdiff_t* 223__distance_type(const _Tp*, const __true_type&) 224{ return __STATIC_CAST(ptrdiff_t*, 0); } 225 226template <class _Iter> 227inline _STLP_TYPENAME_ON_RETURN_TYPE _STLP_STD::iterator_traits<_Iter>::difference_type* 228__distance_type(const _Iter&, const __false_type&) { 229 typedef _STLP_TYPENAME _STLP_STD::iterator_traits<_Iter>::difference_type _diff_type; 230 return __STATIC_CAST(_diff_type*,0); 231} 232 233template <class _Tp> 234inline _Tp* 235__value_type(const _Tp*, const __true_type&) 236{ return __STATIC_CAST(_Tp*, 0); } 237 238template <class _Iter> 239inline _STLP_TYPENAME_ON_RETURN_TYPE _STLP_STD::iterator_traits<_Iter>::value_type* 240__value_type(const _Iter&, const __false_type&) { 241 typedef _STLP_TYPENAME _STLP_STD::iterator_traits<_Iter>::value_type _value_type; 242 return __STATIC_CAST(_value_type*,0); 243} 244 245# endif 246 247#else /* _STLP_USE_OLD_HP_ITERATOR_QUERIES */ 248template <class _Category, class _Tp, class _Distance, class _Pointer, class _Reference> 249inline _Category _STLP_CALL iterator_category(const iterator<_Category,_Tp,_Distance,_Pointer,_Reference>&) { return _Category(); } 250template <class _Category, class _Tp, class _Distance, class _Pointer, class _Reference> 251inline _Tp* _STLP_CALL value_type(const iterator<_Category,_Tp,_Distance,_Pointer,_Reference>&) { return __STATIC_CAST(_Tp*, 0); } 252template <class _Category, class _Tp, class _Distance, class _Pointer, class _Reference> 253inline _Distance* _STLP_CALL distance_type(const iterator<_Category,_Tp,_Distance,_Pointer,_Reference>&) { return __STATIC_CAST(_Distance*, 0); } 254template <class _Tp> 255inline random_access_iterator_tag _STLP_CALL iterator_category(const _Tp*) { return random_access_iterator_tag(); } 256template <class _Tp> 257inline _Tp* _STLP_CALL value_type(const _Tp*) { return __STATIC_CAST(_Tp*, 0); } 258template <class _Tp> 259inline ptrdiff_t* _STLP_CALL distance_type(const _Tp*) { return __STATIC_CAST(ptrdiff_t*, 0); } 260#endif /* _STLP_USE_OLD_HP_ITERATOR_QUERIES */ 261 262#if !defined (_STLP_NO_ANACHRONISMS) 263// The base classes input_iterator, output_iterator, forward_iterator, 264// bidirectional_iterator, and random_access_iterator are not part of 265// the C++ standard. (They have been replaced by struct iterator.) 266// They are included for backward compatibility with the HP STL. 267template <class _Tp, class _Distance> struct input_iterator : 268 public iterator <input_iterator_tag, _Tp, _Distance, _Tp*, _Tp&> {}; 269struct output_iterator : public iterator <output_iterator_tag, void, void, void, void> {}; 270template <class _Tp, class _Distance> struct forward_iterator : 271 public iterator<forward_iterator_tag, _Tp, _Distance, _Tp*, _Tp&> {}; 272template <class _Tp, class _Distance> struct bidirectional_iterator : 273 public iterator<bidirectional_iterator_tag, _Tp, _Distance, _Tp*, _Tp&> {}; 274template <class _Tp, class _Distance> struct random_access_iterator : 275 public iterator<random_access_iterator_tag, _Tp, _Distance, _Tp*, _Tp&> {}; 276 277# if defined (_STLP_BASE_MATCH_BUG) && defined (_STLP_USE_OLD_HP_ITERATOR_QUERIES) 278template <class _Tp, class _Distance> 279inline input_iterator_tag _STLP_CALL 280iterator_category(const input_iterator<_Tp, _Distance>&) { return input_iterator_tag(); } 281inline output_iterator_tag _STLP_CALL 282iterator_category(const output_iterator&) { return output_iterator_tag(); } 283template <class _Tp, class _Distance> 284inline forward_iterator_tag _STLP_CALL 285iterator_category(const forward_iterator<_Tp, _Distance>&) { return forward_iterator_tag(); } 286template <class _Tp, class _Distance> 287inline bidirectional_iterator_tag _STLP_CALL 288iterator_category(const bidirectional_iterator<_Tp, _Distance>&) { return bidirectional_iterator_tag(); } 289template <class _Tp, class _Distance> 290inline random_access_iterator_tag _STLP_CALL 291iterator_category(const random_access_iterator<_Tp, _Distance>&) { return random_access_iterator_tag(); } 292template <class _Tp, class _Distance> 293inline _Tp* _STLP_CALL value_type(const input_iterator<_Tp, _Distance>&) { return __STATIC_CAST(_Tp*, 0); } 294template <class _Tp, class _Distance> 295inline _Tp* _STLP_CALL value_type(const forward_iterator<_Tp, _Distance>&) { return __STATIC_CAST(_Tp*, 0); } 296template <class _Tp, class _Distance> 297inline _Tp* _STLP_CALL value_type(const bidirectional_iterator<_Tp, _Distance>&) { return __STATIC_CAST(_Tp*, 0); } 298template <class _Tp, class _Distance> 299inline _Tp* _STLP_CALL value_type(const random_access_iterator<_Tp, _Distance>&) { return __STATIC_CAST(_Tp*, 0); } 300template <class _Tp, class _Distance> 301inline _Distance* _STLP_CALL distance_type(const input_iterator<_Tp, _Distance>&) { return __STATIC_CAST(_Distance*, 0); } 302template <class _Tp, class _Distance> 303inline _Distance* _STLP_CALL distance_type(const forward_iterator<_Tp, _Distance>&) { return __STATIC_CAST(_Distance*, 0); } 304template <class _Tp, class _Distance> 305inline _Distance* _STLP_CALL distance_type(const bidirectional_iterator<_Tp, _Distance>&) { return __STATIC_CAST(_Distance*, 0);} 306template <class _Tp, class _Distance> 307inline _Distance* _STLP_CALL distance_type(const random_access_iterator<_Tp, _Distance>&) { return __STATIC_CAST(_Distance*, 0); } 308# endif 309#endif 310 311_STLP_MOVE_TO_PRIV_NAMESPACE 312 313template <class _InputIterator> 314inline _STLP_DIFFERENCE_TYPE(_InputIterator) _STLP_CALL 315__distance(const _InputIterator& __first, const _InputIterator& __last, 316 const input_iterator_tag &) { 317 _STLP_DIFFERENCE_TYPE(_InputIterator) __n = 0; 318 _InputIterator __it(__first); 319 while (__it != __last) { 320 ++__it; ++__n; 321 } 322 return __n; 323} 324 325#if defined (_STLP_NONTEMPL_BASE_MATCH_BUG) 326template <class _ForwardIterator> 327inline _STLP_DIFFERENCE_TYPE(_ForwardIterator) _STLP_CALL 328__distance(const _ForwardIterator& __first, const _ForwardIterator& __last, 329 const forward_iterator_tag &) { 330 _STLP_DIFFERENCE_TYPE(_ForwardIterator) __n = 0; 331 _ForwardIterator __it(__first); 332 while (__it != __last) { 333 ++__it; ++__n; 334 } 335 return __n; 336} 337 338template <class _BidirectionalIterator> 339_STLP_INLINE_LOOP _STLP_DIFFERENCE_TYPE(_BidirectionalIterator) _STLP_CALL 340__distance(const _BidirectionalIterator& __first, const _BidirectionalIterator& __last, 341 const bidirectional_iterator_tag &) { 342 _STLP_DIFFERENCE_TYPE(_BidirectionalIterator) __n = 0; 343 _BidirectionalIterator __it(__first); 344 while (__it != __last) { 345 ++__it; ++__n; 346 } 347 return __n; 348} 349#endif 350 351template <class _RandomAccessIterator> 352inline _STLP_DIFFERENCE_TYPE(_RandomAccessIterator) _STLP_CALL 353__distance(const _RandomAccessIterator& __first, const _RandomAccessIterator& __last, 354 const random_access_iterator_tag &) 355{ return __last - __first; } 356 357_STLP_MOVE_TO_STD_NAMESPACE 358 359template <class _InputIterator> 360inline _STLP_DIFFERENCE_TYPE(_InputIterator) _STLP_CALL 361distance(_InputIterator __first, _InputIterator __last) 362{ return _STLP_PRIV __distance(__first, __last, _STLP_ITERATOR_CATEGORY(__first, _InputIterator)); } 363 364#if !defined (_STLP_NO_ANACHRONISMS) 365template <class _InputIterator, class _Distance> 366inline void _STLP_CALL distance(const _InputIterator& __first, 367 const _InputIterator& __last, _Distance& __n) 368{ __n += _STLP_STD::distance(__first, __last); } 369 370# if defined (_STLP_MSVC) 371// MSVC specific 372template <class _InputIterator, class _Dist> 373inline void _STLP_CALL _Distance(_InputIterator __first, 374 _InputIterator __last, _Dist& __n) 375{ __n += _STLP_STD::distance(__first, __last); } 376# endif 377#endif 378 379// fbp: those are being used for iterator/const_iterator definitions everywhere 380template <class _Tp> 381struct _Nonconst_traits; 382 383template <class _Tp> 384struct _Const_traits { 385 typedef _Tp value_type; 386 typedef const _Tp& reference; 387 typedef const _Tp* pointer; 388 typedef _Const_traits<_Tp> _ConstTraits; 389 typedef _Nonconst_traits<_Tp> _NonConstTraits; 390}; 391 392template <class _Tp> 393struct _Nonconst_traits { 394 typedef _Tp value_type; 395 typedef _Tp& reference; 396 typedef _Tp* pointer; 397 typedef _Const_traits<_Tp> _ConstTraits; 398 typedef _Nonconst_traits<_Tp> _NonConstTraits; 399}; 400 401/* 402 * dums: A special iterator/const_iterator traits for set and multiset for which even 403 * the iterator is not mutable 404 */ 405template <class _Tp> 406struct _Nonconst_Const_traits; 407 408template <class _Tp> 409struct _Const_Const_traits { 410 typedef _Tp value_type; 411 typedef const _Tp& reference; 412 typedef const _Tp* pointer; 413 typedef _Const_Const_traits<_Tp> _ConstTraits; 414 typedef _Nonconst_Const_traits<_Tp> _NonConstTraits; 415}; 416 417template <class _Tp> 418struct _Nonconst_Const_traits { 419 typedef _Tp value_type; 420 typedef const _Tp& reference; 421 typedef const _Tp* pointer; 422 typedef _Const_Const_traits<_Tp> _ConstTraits; 423 typedef _Nonconst_Const_traits<_Tp> _NonConstTraits; 424}; 425 426/* 427 * A macro to generate a new iterator traits from one of the 428 * previous one. Changing the iterator traits type make iterators 429 * from different containers not comparable. 430 */ 431#define _STLP_CREATE_ITERATOR_TRAITS_BASE(Motif, Traits) \ 432template <class _Tp> \ 433struct _##Motif; \ 434template <class _Tp> \ 435struct _Const##Motif : public _STLP_STD::_Const_##Traits<_Tp> { \ 436 typedef _Const##Motif<_Tp> _ConstTraits; \ 437 typedef _##Motif<_Tp> _NonConstTraits; \ 438}; \ 439template <class _Tp> \ 440struct _##Motif : public _STLP_STD::_Nonconst_##Traits<_Tp> { \ 441 typedef _Const##Motif<_Tp> _ConstTraits; \ 442 typedef _##Motif<_Tp> _NonConstTraits; \ 443}; 444 445#define _STLP_CREATE_ITERATOR_TRAITS(Motif, Traits) \ 446_STLP_MOVE_TO_PRIV_NAMESPACE \ 447_STLP_CREATE_ITERATOR_TRAITS_BASE(Motif, Traits) \ 448_STLP_MOVE_TO_STD_NAMESPACE 449 450#define _STLP_CREATE_HASH_ITERATOR_TRAITS(Motif, Traits) \ 451_STLP_MOVE_TO_PRIV_NAMESPACE \ 452_STLP_CREATE_ITERATOR_TRAITS_BASE(NonLocal##Motif, Traits) \ 453_STLP_CREATE_ITERATOR_TRAITS_BASE(Local##Motif, Traits) \ 454template <class _Tp> \ 455struct _##Motif { \ 456 typedef _ConstNonLocal##Motif<_Tp> _ConstTraits; \ 457 typedef _NonLocal##Motif<_Tp> _NonConstTraits; \ 458 typedef _ConstLocal##Motif<_Tp> _ConstLocalTraits; \ 459 typedef _Local##Motif<_Tp> _NonConstLocalTraits; \ 460}; \ 461_STLP_MOVE_TO_STD_NAMESPACE 462 463/* 464# if defined (_STLP_BASE_TYPEDEF_BUG) 465// this workaround is needed for SunPro 4.0.1 466template <class _Traits> 467struct __cnst_traits_aux : private _Traits { 468 typedef typename _Traits::value_type value_type; 469}; 470# define __TRAITS_VALUE_TYPE(_Traits) __cnst_traits_aux<_Traits>::value_type 471# else 472# define __TRAITS_VALUE_TYPE(_Traits) _Traits::value_type 473# endif 474*/ 475 476_STLP_MOVE_TO_PRIV_NAMESPACE 477 478template <class _InputIter, class _Distance> 479_STLP_INLINE_LOOP void _STLP_CALL 480__advance(_InputIter& __i, _Distance __n, const input_iterator_tag &) 481{ while (__n--) ++__i; } 482 483// fbp : added output iterator tag variant 484template <class _InputIter, class _Distance> 485_STLP_INLINE_LOOP void _STLP_CALL 486__advance(_InputIter& __i, _Distance __n, const output_iterator_tag &) 487{ while (__n--) ++__i; } 488 489#if defined (_STLP_NONTEMPL_BASE_MATCH_BUG) 490template <class _ForwardIterator, class _Distance> 491_STLP_INLINE_LOOP void _STLP_CALL 492__advance(_ForwardIterator& i, _Distance n, const forward_iterator_tag &) 493{ while (n--) ++i; } 494#endif 495 496template <class _BidirectionalIterator, class _Distance> 497_STLP_INLINE_LOOP void _STLP_CALL 498__advance(_BidirectionalIterator& __i, _Distance __n, 499 const bidirectional_iterator_tag &) { 500 if (__n > 0) 501 while (__n--) ++__i; 502 else 503 while (__n++) --__i; 504} 505 506template <class _RandomAccessIterator, class _Distance> 507inline void _STLP_CALL 508__advance(_RandomAccessIterator& __i, _Distance __n, 509 const random_access_iterator_tag &) 510{ __i += __n; } 511 512_STLP_MOVE_TO_STD_NAMESPACE 513 514template <class _InputIterator, class _Distance> 515inline void _STLP_CALL advance(_InputIterator& __i, _Distance __n) 516{ _STLP_PRIV __advance(__i, __n, _STLP_ITERATOR_CATEGORY(__i, _InputIterator)); } 517 518_STLP_END_NAMESPACE 519 520#endif /* _STLP_INTERNAL_ITERATOR_BASE_H */ 521 522 523// Local Variables: 524// mode:C++ 525// End: 526