1 // Debugging support implementation -*- C++ -*- 2 3 // Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 4 // Free Software Foundation, Inc. 5 // 6 // This file is part of the GNU ISO C++ Library. This library is free 7 // software; you can redistribute it and/or modify it under the 8 // terms of the GNU General Public License as published by the 9 // Free Software Foundation; either version 3, or (at your option) 10 // any later version. 11 12 // This library is distributed in the hope that it will be useful, 13 // but WITHOUT ANY WARRANTY; without even the implied warranty of 14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 // GNU General Public License for more details. 16 17 // Under Section 7 of GPL version 3, you are granted additional 18 // permissions described in the GCC Runtime Library Exception, version 19 // 3.1, as published by the Free Software Foundation. 20 21 // You should have received a copy of the GNU General Public License and 22 // a copy of the GCC Runtime Library Exception along with this program; 23 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24 // <http://www.gnu.org/licenses/>. 25 26 /** @file debug/functions.h 27 * This file is a GNU debug extension to the Standard C++ Library. 28 */ 29 30 #ifndef _GLIBCXX_DEBUG_FUNCTIONS_H 31 #define _GLIBCXX_DEBUG_FUNCTIONS_H 1 32 33 #include <bits/c++config.h> 34 #include <cstddef> // for ptrdiff_t 35 #include <bits/stl_iterator_base_types.h> // for iterator_traits, categories 36 #include <bits/cpp_type_traits.h> // for __is_integer 37 38 namespace __gnu_debug 39 { 40 template<typename _Iterator, typename _Sequence> 41 class _Safe_iterator; 42 43 // An arbitrary iterator pointer is not singular. 44 inline bool 45 __check_singular_aux(const void*) { return false; } 46 47 // We may have an iterator that derives from _Safe_iterator_base but isn't 48 // a _Safe_iterator. 49 template<typename _Iterator> 50 inline bool 51 __check_singular(_Iterator& __x) 52 { return __check_singular_aux(&__x); } 53 54 /** Non-NULL pointers are nonsingular. */ 55 template<typename _Tp> 56 inline bool 57 __check_singular(const _Tp* __ptr) 58 { return __ptr == 0; } 59 60 /** Safe iterators know if they are singular. */ 61 template<typename _Iterator, typename _Sequence> 62 inline bool 63 __check_singular(const _Safe_iterator<_Iterator, _Sequence>& __x) 64 { return __x._M_singular(); } 65 66 /** Assume that some arbitrary iterator is dereferenceable, because we 67 can't prove that it isn't. */ 68 template<typename _Iterator> 69 inline bool 70 __check_dereferenceable(_Iterator&) 71 { return true; } 72 73 /** Non-NULL pointers are dereferenceable. */ 74 template<typename _Tp> 75 inline bool 76 __check_dereferenceable(const _Tp* __ptr) 77 { return __ptr; } 78 79 /** Safe iterators know if they are singular. */ 80 template<typename _Iterator, typename _Sequence> 81 inline bool 82 __check_dereferenceable(const _Safe_iterator<_Iterator, _Sequence>& __x) 83 { return __x._M_dereferenceable(); } 84 85 /** If the distance between two random access iterators is 86 * nonnegative, assume the range is valid. 87 */ 88 template<typename _RandomAccessIterator> 89 inline bool 90 __valid_range_aux2(const _RandomAccessIterator& __first, 91 const _RandomAccessIterator& __last, 92 std::random_access_iterator_tag) 93 { return __last - __first >= 0; } 94 95 /** Can't test for a valid range with input iterators, because 96 * iteration may be destructive. So we just assume that the range 97 * is valid. 98 */ 99 template<typename _InputIterator> 100 inline bool 101 __valid_range_aux2(const _InputIterator&, const _InputIterator&, 102 std::input_iterator_tag) 103 { return true; } 104 105 /** We say that integral types for a valid range, and defer to other 106 * routines to realize what to do with integral types instead of 107 * iterators. 108 */ 109 template<typename _Integral> 110 inline bool 111 __valid_range_aux(const _Integral&, const _Integral&, std::__true_type) 112 { return true; } 113 114 /** We have iterators, so figure out what kind of iterators that are 115 * to see if we can check the range ahead of time. 116 */ 117 template<typename _InputIterator> 118 inline bool 119 __valid_range_aux(const _InputIterator& __first, 120 const _InputIterator& __last, std::__false_type) 121 { 122 typedef typename std::iterator_traits<_InputIterator>::iterator_category 123 _Category; 124 return __valid_range_aux2(__first, __last, _Category()); 125 } 126 127 /** Don't know what these iterators are, or if they are even 128 * iterators (we may get an integral type for InputIterator), so 129 * see if they are integral and pass them on to the next phase 130 * otherwise. 131 */ 132 template<typename _InputIterator> 133 inline bool 134 __valid_range(const _InputIterator& __first, const _InputIterator& __last) 135 { 136 typedef typename std::__is_integer<_InputIterator>::__type _Integral; 137 return __valid_range_aux(__first, __last, _Integral()); 138 } 139 140 /** Safe iterators know how to check if they form a valid range. */ 141 template<typename _Iterator, typename _Sequence> 142 inline bool 143 __valid_range(const _Safe_iterator<_Iterator, _Sequence>& __first, 144 const _Safe_iterator<_Iterator, _Sequence>& __last) 145 { return __first._M_valid_range(__last); } 146 147 /* Checks that [first, last) is a valid range, and then returns 148 * __first. This routine is useful when we can't use a separate 149 * assertion statement because, e.g., we are in a constructor. 150 */ 151 template<typename _InputIterator> 152 inline _InputIterator 153 __check_valid_range(const _InputIterator& __first, 154 const _InputIterator& __last 155 __attribute__((__unused__))) 156 { 157 _GLIBCXX_DEBUG_ASSERT(__valid_range(__first, __last)); 158 return __first; 159 } 160 161 /** Checks that __s is non-NULL or __n == 0, and then returns __s. */ 162 template<typename _CharT, typename _Integer> 163 inline const _CharT* 164 __check_string(const _CharT* __s, 165 const _Integer& __n __attribute__((__unused__))) 166 { 167 #ifdef _GLIBCXX_DEBUG_PEDANTIC 168 _GLIBCXX_DEBUG_ASSERT(__s != 0 || __n == 0); 169 #endif 170 return __s; 171 } 172 173 /** Checks that __s is non-NULL and then returns __s. */ 174 template<typename _CharT> 175 inline const _CharT* 176 __check_string(const _CharT* __s) 177 { 178 #ifdef _GLIBCXX_DEBUG_PEDANTIC 179 _GLIBCXX_DEBUG_ASSERT(__s != 0); 180 #endif 181 return __s; 182 } 183 184 // Can't check if an input iterator sequence is sorted, because we 185 // can't step through the sequence. 186 template<typename _InputIterator> 187 inline bool 188 __check_sorted_aux(const _InputIterator&, const _InputIterator&, 189 std::input_iterator_tag) 190 { return true; } 191 192 // Can verify if a forward iterator sequence is in fact sorted using 193 // std::__is_sorted 194 template<typename _ForwardIterator> 195 inline bool 196 __check_sorted_aux(_ForwardIterator __first, _ForwardIterator __last, 197 std::forward_iterator_tag) 198 { 199 if (__first == __last) 200 return true; 201 202 _ForwardIterator __next = __first; 203 for (++__next; __next != __last; __first = __next, ++__next) 204 if (*__next < *__first) 205 return false; 206 207 return true; 208 } 209 210 // Can't check if an input iterator sequence is sorted, because we can't step 211 // through the sequence. 212 template<typename _InputIterator, typename _Predicate> 213 inline bool 214 __check_sorted_aux(const _InputIterator&, const _InputIterator&, 215 _Predicate, std::input_iterator_tag) 216 { return true; } 217 218 // Can verify if a forward iterator sequence is in fact sorted using 219 // std::__is_sorted 220 template<typename _ForwardIterator, typename _Predicate> 221 inline bool 222 __check_sorted_aux(_ForwardIterator __first, _ForwardIterator __last, 223 _Predicate __pred, std::forward_iterator_tag) 224 { 225 if (__first == __last) 226 return true; 227 228 _ForwardIterator __next = __first; 229 for (++__next; __next != __last; __first = __next, ++__next) 230 if (__pred(*__next, *__first)) 231 return false; 232 233 return true; 234 } 235 236 // Determine if a sequence is sorted. 237 template<typename _InputIterator> 238 inline bool 239 __check_sorted(const _InputIterator& __first, const _InputIterator& __last) 240 { 241 typedef typename std::iterator_traits<_InputIterator>::iterator_category 242 _Category; 243 244 // Verify that the < operator for elements in the sequence is a 245 // StrictWeakOrdering by checking that it is irreflexive. 246 _GLIBCXX_DEBUG_ASSERT(__first == __last || !(*__first < *__first)); 247 248 return __check_sorted_aux(__first, __last, _Category()); 249 } 250 251 template<typename _InputIterator, typename _Predicate> 252 inline bool 253 __check_sorted(const _InputIterator& __first, const _InputIterator& __last, 254 _Predicate __pred) 255 { 256 typedef typename std::iterator_traits<_InputIterator>::iterator_category 257 _Category; 258 259 // Verify that the predicate is StrictWeakOrdering by checking that it 260 // is irreflexive. 261 _GLIBCXX_DEBUG_ASSERT(__first == __last || !__pred(*__first, *__first)); 262 263 return __check_sorted_aux(__first, __last, __pred, _Category()); 264 } 265 266 template<typename _InputIterator> 267 inline bool 268 __check_sorted_set_aux(const _InputIterator& __first, 269 const _InputIterator& __last, 270 std::__true_type) 271 { return __check_sorted(__first, __last); } 272 273 template<typename _InputIterator> 274 inline bool 275 __check_sorted_set_aux(const _InputIterator&, 276 const _InputIterator&, 277 std::__false_type) 278 { return true; } 279 280 template<typename _InputIterator, typename _Predicate> 281 inline bool 282 __check_sorted_set_aux(const _InputIterator& __first, 283 const _InputIterator& __last, 284 _Predicate __pred, std::__true_type) 285 { return __check_sorted(__first, __last, __pred); } 286 287 template<typename _InputIterator, typename _Predicate> 288 inline bool 289 __check_sorted_set_aux(const _InputIterator&, 290 const _InputIterator&, _Predicate, 291 std::__false_type) 292 { return true; } 293 294 // ... special variant used in std::merge, std::includes, std::set_*. 295 template<typename _InputIterator1, typename _InputIterator2> 296 inline bool 297 __check_sorted_set(const _InputIterator1& __first, 298 const _InputIterator1& __last, 299 const _InputIterator2&) 300 { 301 typedef typename std::iterator_traits<_InputIterator1>::value_type 302 _ValueType1; 303 typedef typename std::iterator_traits<_InputIterator2>::value_type 304 _ValueType2; 305 306 typedef typename std::__are_same<_ValueType1, _ValueType2>::__type 307 _SameType; 308 return __check_sorted_set_aux(__first, __last, _SameType()); 309 } 310 311 template<typename _InputIterator1, typename _InputIterator2, 312 typename _Predicate> 313 inline bool 314 __check_sorted_set(const _InputIterator1& __first, 315 const _InputIterator1& __last, 316 const _InputIterator2&, _Predicate __pred) 317 { 318 typedef typename std::iterator_traits<_InputIterator1>::value_type 319 _ValueType1; 320 typedef typename std::iterator_traits<_InputIterator2>::value_type 321 _ValueType2; 322 323 typedef typename std::__are_same<_ValueType1, _ValueType2>::__type 324 _SameType; 325 return __check_sorted_set_aux(__first, __last, __pred, _SameType()); 326 } 327 328 // _GLIBCXX_RESOLVE_LIB_DEFECTS 329 // 270. Binary search requirements overly strict 330 // Determine if a sequence is partitioned w.r.t. this element. 331 template<typename _ForwardIterator, typename _Tp> 332 inline bool 333 __check_partitioned_lower(_ForwardIterator __first, 334 _ForwardIterator __last, const _Tp& __value) 335 { 336 while (__first != __last && *__first < __value) 337 ++__first; 338 while (__first != __last && !(*__first < __value)) 339 ++__first; 340 return __first == __last; 341 } 342 343 template<typename _ForwardIterator, typename _Tp> 344 inline bool 345 __check_partitioned_upper(_ForwardIterator __first, 346 _ForwardIterator __last, const _Tp& __value) 347 { 348 while (__first != __last && !(__value < *__first)) 349 ++__first; 350 while (__first != __last && __value < *__first) 351 ++__first; 352 return __first == __last; 353 } 354 355 // Determine if a sequence is partitioned w.r.t. this element. 356 template<typename _ForwardIterator, typename _Tp, typename _Pred> 357 inline bool 358 __check_partitioned_lower(_ForwardIterator __first, 359 _ForwardIterator __last, const _Tp& __value, 360 _Pred __pred) 361 { 362 while (__first != __last && bool(__pred(*__first, __value))) 363 ++__first; 364 while (__first != __last && !bool(__pred(*__first, __value))) 365 ++__first; 366 return __first == __last; 367 } 368 369 template<typename _ForwardIterator, typename _Tp, typename _Pred> 370 inline bool 371 __check_partitioned_upper(_ForwardIterator __first, 372 _ForwardIterator __last, const _Tp& __value, 373 _Pred __pred) 374 { 375 while (__first != __last && !bool(__pred(__value, *__first))) 376 ++__first; 377 while (__first != __last && bool(__pred(__value, *__first))) 378 ++__first; 379 return __first == __last; 380 } 381 } // namespace __gnu_debug 382 383 #endif 384
