libstdc++
macros.h
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1 // Debugging support implementation -*- C++ -*-
2 
3 // Copyright (C) 2003-2025 Free Software Foundation, Inc.
4 //
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
9 // any later version.
10 
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
15 
16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
19 
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
24 
25 /** @file debug/macros.h
26  * This file is a GNU debug extension to the Standard C++ Library.
27  */
28 
29 #ifndef _GLIBCXX_DEBUG_MACROS_H
30 #define _GLIBCXX_DEBUG_MACROS_H 1
31 
32 /**
33  * Macros used by the implementation to verify certain
34  * properties. These macros may only be used directly by the debug
35  * wrappers. Note that these are macros (instead of the more obviously
36  * @a correct choice of making them functions) because we need line and
37  * file information at the call site, to minimize the distance between
38  * the user error and where the error is reported.
39  *
40  */
41 
42 #define _GLIBCXX_DEBUG_VERIFY_AT_F(_Cond,_ErrMsg,_File,_Line,_Func) \
43  do { \
44  if (__builtin_expect(!bool(_Cond), false)) \
45  __gnu_debug::_Error_formatter::_S_at(_File, _Line, _Func) \
46  ._ErrMsg._M_error(); \
47  } while (false)
48 
49 #define _GLIBCXX_DEBUG_VERIFY_AT(_Cond,_ErrMsg,_File,_Line) \
50  _GLIBCXX_DEBUG_VERIFY_AT_F(_Cond,_ErrMsg,_File,_Line,__PRETTY_FUNCTION__)
51 
52 #define _GLIBCXX_DEBUG_VERIFY(_Cond,_ErrMsg) \
53  _GLIBCXX_DEBUG_VERIFY_AT_F(_Cond, _ErrMsg, __FILE__, __LINE__, \
54  __PRETTY_FUNCTION__)
55 
56 // Verify that [_First, _Last) forms a valid iterator range.
57 #define __glibcxx_check_valid_range(_First,_Last) \
58 _GLIBCXX_DEBUG_VERIFY(__gnu_debug::__valid_range(_First, _Last), \
59  _M_message(__gnu_debug::__msg_valid_range) \
60  ._M_iterator(_First, #_First) \
61  ._M_iterator(_Last, #_Last))
62 
63 #define __glibcxx_check_valid_range_at(_First,_Last,_File,_Line,_Func) \
64 _GLIBCXX_DEBUG_VERIFY_AT_F(__gnu_debug::__valid_range(_First, _Last), \
65  _M_message(__gnu_debug::__msg_valid_range) \
66  ._M_iterator(_First, #_First) \
67  ._M_iterator(_Last, #_Last), \
68  _File,_Line,_Func)
69 
70 #define __glibcxx_check_valid_range2(_First,_Last,_Dist) \
71 _GLIBCXX_DEBUG_VERIFY(__gnu_debug::__valid_range(_First, _Last, _Dist), \
72  _M_message(__gnu_debug::__msg_valid_range) \
73  ._M_iterator(_First, #_First) \
74  ._M_iterator(_Last, #_Last))
75 
76 #define __glibcxx_check_valid_constructor_range(_First,_Last) \
77  __gnu_debug::__check_valid_range(_First, _Last, \
78  __FILE__, __LINE__, __PRETTY_FUNCTION__)
79 
80 // Verify that [_First, _Last) forms a non-empty iterator range.
81 #define __glibcxx_check_non_empty_range(_First,_Last) \
82 _GLIBCXX_DEBUG_VERIFY(_First != _Last, \
83  _M_message(__gnu_debug::__msg_non_empty_range) \
84  ._M_iterator(_First, #_First) \
85  ._M_iterator(_Last, #_Last))
86 
87 // Verify that [_First, _First + _Size) forms a valid range.
88 #define __glibcxx_check_can_increment(_First,_Size) \
89 _GLIBCXX_DEBUG_VERIFY(__gnu_debug::__can_advance(_First, _Size), \
90  _M_message(__gnu_debug::__msg_iter_subscript_oob) \
91  ._M_iterator(_First, #_First) \
92  ._M_integer(_Size, #_Size))
93 
94 #define __glibcxx_check_can_increment_dist(_First,_Dist,_Way) \
95  _GLIBCXX_DEBUG_VERIFY(__gnu_debug::__can_advance(_First, _Dist, _Way), \
96  _M_message(__gnu_debug::__msg_iter_subscript_oob) \
97  ._M_iterator(_First, #_First) \
98  ._M_integer(_Way * _Dist.first, #_Dist))
99 
100 #define __glibcxx_check_can_increment_range(_First1,_Last1,_First2) \
101  do \
102  { \
103  typename __gnu_debug::_Distance_traits<__decltype(_First1)>::__type __dist;\
104  _GLIBCXX_DEBUG_VERIFY_AT_F( \
105  __gnu_debug::__valid_range(_First1, _Last1, __dist),\
106  _M_message(__gnu_debug::__msg_valid_range) \
107  ._M_iterator(_First1, #_First1) \
108  ._M_iterator(_Last1, #_Last1), \
109  __FILE__,__LINE__,__PRETTY_FUNCTION__); \
110  _GLIBCXX_DEBUG_VERIFY_AT_F( \
111  __gnu_debug::__can_advance(_First2, __dist, 1), \
112  _M_message(__gnu_debug::__msg_iter_subscript_oob)\
113  ._M_iterator(_First2, #_First2) \
114  ._M_integer(__dist.first), \
115  __FILE__,__LINE__,__PRETTY_FUNCTION__); \
116  } while(false)
117 
118 #define __glibcxx_check_can_decrement_range(_First1,_Last1,_First2) \
119  do \
120  { \
121  typename __gnu_debug::_Distance_traits<__decltype(_First1)>::__type __dist;\
122  _GLIBCXX_DEBUG_VERIFY_AT_F( \
123  __gnu_debug::__valid_range(_First1, _Last1, __dist),\
124  _M_message(__gnu_debug::__msg_valid_range) \
125  ._M_iterator(_First1, #_First1) \
126  ._M_iterator(_Last1, #_Last1), \
127  __FILE__,__LINE__,__PRETTY_FUNCTION__); \
128  _GLIBCXX_DEBUG_VERIFY_AT_F( \
129  __gnu_debug::__can_advance(_First2, __dist, -1), \
130  _M_message(__gnu_debug::__msg_iter_subscript_oob)\
131  ._M_iterator(_First2, #_First2) \
132  ._M_integer(-__dist.first), \
133  __FILE__,__LINE__,__PRETTY_FUNCTION__); \
134  } while(false)
135 
136 /** Verify that we can insert into *this with the iterator _Position.
137  * Insertion into a container at a specific position requires that
138  * the iterator be nonsingular, either dereferenceable or past-the-end,
139  * and that it reference the sequence we are inserting into. Note that
140  * this macro is only valid when the container is a_Safe_sequence and
141  * the iterator is a _Safe_iterator.
142 */
143 #define __glibcxx_check_insert(_Position) \
144 _GLIBCXX_DEBUG_VERIFY(!_Position._M_singular(), \
145  _M_message(__gnu_debug::__msg_insert_singular) \
146  ._M_sequence(*this, "this") \
147  ._M_iterator(_Position, #_Position)); \
148 _GLIBCXX_DEBUG_VERIFY(_Position._M_attached_to(this), \
149  _M_message(__gnu_debug::__msg_insert_different) \
150  ._M_sequence(*this, "this") \
151  ._M_iterator(_Position, #_Position))
152 
153 /** Verify that we can insert into *this after the iterator _Position.
154  * Insertion into a container after a specific position requires that
155  * the iterator be nonsingular, either dereferenceable or before-begin,
156  * and that it reference the sequence we are inserting into. Note that
157  * this macro is only valid when the container is a_Safe_sequence and
158  * the iterator is a _Safe_iterator.
159 */
160 #define __glibcxx_check_insert_after(_Position) \
161 __glibcxx_check_insert(_Position); \
162 _GLIBCXX_DEBUG_VERIFY(!_Position._M_is_end(), \
163  _M_message(__gnu_debug::__msg_insert_after_end) \
164  ._M_sequence(*this, "this") \
165  ._M_iterator(_Position, #_Position))
166 
167 /** Verify that we can insert the values in the iterator range
168  * [_First, _Last) into *this with the iterator _Position. Insertion
169  * into a container at a specific position requires that the iterator
170  * be nonsingular (i.e., either dereferenceable or past-the-end),
171  * that it reference the sequence we are inserting into, and that the
172  * iterator range [_First, _Last) is a valid (possibly empty)
173  * range which does not reference the sequence we are inserting into.
174  * Note that this macro is only valid when the container is a
175  * _Safe_sequence and the _Position iterator is a _Safe_iterator.
176 */
177 #define __glibcxx_check_insert_range(_Position,_First,_Last,_Dist) \
178 __glibcxx_check_valid_range2(_First,_Last,_Dist); \
179 __glibcxx_check_insert(_Position); \
180 _GLIBCXX_DEBUG_VERIFY(__gnu_debug::__foreign_iterator(_Position,_First,_Last),\
181  _M_message(__gnu_debug::__msg_insert_range_from_self)\
182  ._M_iterator(_First, #_First) \
183  ._M_iterator(_Last, #_Last) \
184  ._M_sequence(*this, "this"))
185 
186 /** Verify that we can insert the values in the iterator range
187  * [_First, _Last) into *this after the iterator _Position. Insertion
188  * into a container after a specific position requires that the iterator
189  * be nonsingular (i.e., either dereferenceable or past-the-end),
190  * that it reference the sequence we are inserting into, and that the
191  * iterator range [_First, _Last) is a valid (possibly empty)
192  * range which does not reference the sequence we are inserting into.
193  * Note that this macro is only valid when the container is a
194  * _Safe_sequence and the _Position iterator is a _Safe_iterator.
195 */
196 #define __glibcxx_check_insert_range_after(_Position,_First,_Last,_Dist)\
197 __glibcxx_check_valid_range2(_First,_Last,_Dist); \
198 __glibcxx_check_insert_after(_Position); \
199 _GLIBCXX_DEBUG_VERIFY(__gnu_debug::__foreign_iterator(_Position,_First,_Last),\
200  _M_message(__gnu_debug::__msg_insert_range_from_self)\
201  ._M_iterator(_First, #_First) \
202  ._M_iterator(_Last, #_Last) \
203  ._M_sequence(*this, "this"))
204 
205 /** Verify that we can erase the element referenced by the iterator
206  * _Position. We can erase the element if the _Position iterator is
207  * dereferenceable and references this sequence.
208 */
209 #define __glibcxx_check_erase(_Position) \
210 _GLIBCXX_DEBUG_VERIFY(_Position._M_dereferenceable(), \
211  _M_message(__gnu_debug::__msg_erase_bad) \
212  ._M_sequence(*this, "this") \
213  ._M_iterator(_Position, #_Position)); \
214 _GLIBCXX_DEBUG_VERIFY(_Position._M_attached_to(this), \
215  _M_message(__gnu_debug::__msg_erase_different) \
216  ._M_sequence(*this, "this") \
217  ._M_iterator(_Position, #_Position))
218 
219 #if __cplusplus >= 201103L
220 # define __glibcxx_check_erase2(_CPosition) \
221 _GLIBCXX_DEBUG_VERIFY(_CPosition != _M_base().cend(), \
222  _M_message(__gnu_debug::__msg_erase_bad) \
223  ._M_sequence(*this, "this") \
224  ._M_iterator(_CPosition, #_CPosition));
225 #endif
226 
227 /** Verify that we can erase the element after the iterator
228  * _Position. We can erase the element if the _Position iterator is
229  * before a dereferenceable one and references this sequence.
230 */
231 #define __glibcxx_check_erase_after(_Position) \
232 _GLIBCXX_DEBUG_VERIFY(_Position._M_before_dereferenceable(), \
233  _M_message(__gnu_debug::__msg_erase_after_bad) \
234  ._M_sequence(*this, "this") \
235  ._M_iterator(_Position, #_Position)); \
236 _GLIBCXX_DEBUG_VERIFY(_Position._M_attached_to(this), \
237  _M_message(__gnu_debug::__msg_erase_different) \
238  ._M_sequence(*this, "this") \
239  ._M_iterator(_Position, #_Position))
240 
241 /** Verify that we can erase the elements in the iterator range
242  * [_First, _Last). We can erase the elements if [_First, _Last) is a
243  * valid iterator range within this sequence.
244 */
245 #define __glibcxx_check_erase_range(_First,_Last) \
246 __glibcxx_check_valid_range(_First,_Last); \
247 _GLIBCXX_DEBUG_VERIFY(_First._M_attached_to(this), \
248  _M_message(__gnu_debug::__msg_erase_different) \
249  ._M_sequence(*this, "this") \
250  ._M_iterator(_First, #_First) \
251  ._M_iterator(_Last, #_Last))
252 
253 /** Verify that we can erase the elements in the iterator range
254  * (_First, _Last). We can erase the elements if (_First, _Last) is a
255  * valid iterator range within this sequence.
256 */
257 #define __glibcxx_check_erase_range_after(_First,_Last) \
258 _GLIBCXX_DEBUG_VERIFY(!_First._M_singular() && !_Last._M_singular(), \
259  _M_message(__gnu_debug::__msg_erase_different) \
260  ._M_sequence(*this, "this") \
261  ._M_iterator(_First, #_First) \
262  ._M_iterator(_Last, #_Last)); \
263 _GLIBCXX_DEBUG_VERIFY(_First._M_can_compare(_Last), \
264  _M_message(__gnu_debug::__msg_erase_different) \
265  ._M_sequence(*this, "this") \
266  ._M_iterator(_First, #_First) \
267  ._M_iterator(_Last, #_Last)); \
268 _GLIBCXX_DEBUG_VERIFY(_First._M_attached_to(this), \
269  _M_message(__gnu_debug::__msg_erase_different) \
270  ._M_sequence(*this, "this") \
271  ._M_iterator(_First, #_First)); \
272 _GLIBCXX_DEBUG_VERIFY(_First != _Last, \
273  _M_message(__gnu_debug::__msg_valid_range2) \
274  ._M_sequence(*this, "this") \
275  ._M_iterator(_First, #_First) \
276  ._M_iterator(_Last, #_Last)); \
277 _GLIBCXX_DEBUG_VERIFY(_First._M_incrementable(), \
278  _M_message(__gnu_debug::__msg_valid_range2) \
279  ._M_sequence(*this, "this") \
280  ._M_iterator(_First, #_First) \
281  ._M_iterator(_Last, #_Last)); \
282 _GLIBCXX_DEBUG_VERIFY(!_Last._M_is_before_begin(), \
283  _M_message(__gnu_debug::__msg_valid_range2) \
284  ._M_sequence(*this, "this") \
285  ._M_iterator(_First, #_First) \
286  ._M_iterator(_Last, #_Last)) \
287 
288 // Verify that the subscript _N is less than the container's size.
289 #define __glibcxx_check_subscript(_N) \
290 _GLIBCXX_DEBUG_VERIFY(_N < this->size(), \
291  _M_message(__gnu_debug::__msg_subscript_oob) \
292  ._M_sequence(*this, "this") \
293  ._M_integer(_N, #_N) \
294  ._M_integer(this->size(), "size"))
295 
296 // Verify that the bucket _N is less than the container's buckets count.
297 #define __glibcxx_check_bucket_index(_N) \
298 _GLIBCXX_DEBUG_VERIFY(_N < this->bucket_count(), \
299  _M_message(__gnu_debug::__msg_bucket_index_oob) \
300  ._M_sequence(*this, "this") \
301  ._M_integer(_N, #_N) \
302  ._M_integer(this->bucket_count(), "size"))
303 
304 // Verify that the container is nonempty
305 #define __glibcxx_check_nonempty() \
306 _GLIBCXX_DEBUG_VERIFY(! this->empty(), \
307  _M_message(__gnu_debug::__msg_empty) \
308  ._M_sequence(*this, "this"))
309 
310 // Verify that a predicate is irreflexive
311 #define __glibcxx_check_irreflexive(_First,_Last) \
312  _GLIBCXX_DEBUG_VERIFY(_First == _Last || !(*_First < *_First), \
313  _M_message(__gnu_debug::__msg_irreflexive_ordering) \
314  ._M_iterator_value_type(_First, "< operator type"))
315 
316 #if __cplusplus >= 201103L
317 # define __glibcxx_check_irreflexive2(_First,_Last) \
318  _GLIBCXX_DEBUG_VERIFY(_First == _Last \
319  || __gnu_debug::__is_irreflexive(_First), \
320  _M_message(__gnu_debug::__msg_irreflexive_ordering) \
321  ._M_iterator_value_type(_First, "< operator type"))
322 #else
323 # define __glibcxx_check_irreflexive2(_First,_Last)
324 #endif
325 
326 #define __glibcxx_check_irreflexive_pred(_First,_Last,_Pred) \
327  _GLIBCXX_DEBUG_VERIFY(_First == _Last || !_Pred(*_First, *_First), \
328  _M_message(__gnu_debug::__msg_irreflexive_ordering) \
329  ._M_instance(_Pred, "functor") \
330  ._M_iterator_value_type(_First, "ordered type"))
331 
332 #if __cplusplus >= 201103L
333 # define __glibcxx_check_irreflexive_pred2(_First,_Last,_Pred) \
334  _GLIBCXX_DEBUG_VERIFY(_First == _Last \
335  ||__gnu_debug::__is_irreflexive_pred(_First, _Pred), \
336  _M_message(__gnu_debug::__msg_irreflexive_ordering) \
337  ._M_instance(_Pred, "functor") \
338  ._M_iterator_value_type(_First, "ordered type"))
339 #else
340 # define __glibcxx_check_irreflexive_pred2(_First,_Last,_Pred)
341 #endif
342 
343 // Verify that the iterator range [_First, _Last) is sorted
344 #define __glibcxx_check_sorted(_First,_Last) \
345 __glibcxx_check_valid_range(_First,_Last); \
346 __glibcxx_check_irreflexive(_First,_Last); \
347  _GLIBCXX_DEBUG_VERIFY(__gnu_debug::__check_sorted( \
348  __gnu_debug::__base(_First), \
349  __gnu_debug::__base(_Last)), \
350  _M_message(__gnu_debug::__msg_unsorted) \
351  ._M_iterator(_First, #_First) \
352  ._M_iterator(_Last, #_Last))
353 
354 /** Verify that the iterator range [_First, _Last) is sorted by the
355  predicate _Pred. */
356 #define __glibcxx_check_sorted_pred(_First,_Last,_Pred) \
357 __glibcxx_check_valid_range(_First,_Last); \
358 __glibcxx_check_irreflexive_pred(_First,_Last,_Pred); \
359 _GLIBCXX_DEBUG_VERIFY(__gnu_debug::__check_sorted( \
360  __gnu_debug::__base(_First), \
361  __gnu_debug::__base(_Last), _Pred), \
362  _M_message(__gnu_debug::__msg_unsorted_pred) \
363  ._M_iterator(_First, #_First) \
364  ._M_iterator(_Last, #_Last) \
365  ._M_string(#_Pred))
366 
367 // Special variant for std::merge, std::includes, std::set_*
368 #define __glibcxx_check_sorted_set(_First1,_Last1,_First2) \
369 __glibcxx_check_valid_range(_First1,_Last1); \
370 _GLIBCXX_DEBUG_VERIFY( \
371  __gnu_debug::__check_sorted_set(__gnu_debug::__base(_First1), \
372  __gnu_debug::__base(_Last1), _First2),\
373  _M_message(__gnu_debug::__msg_unsorted) \
374  ._M_iterator(_First1, #_First1) \
375  ._M_iterator(_Last1, #_Last1))
376 
377 // Likewise with a _Pred.
378 #define __glibcxx_check_sorted_set_pred(_First1,_Last1,_First2,_Pred) \
379 __glibcxx_check_valid_range(_First1,_Last1); \
380 _GLIBCXX_DEBUG_VERIFY( \
381  __gnu_debug::__check_sorted_set(__gnu_debug::__base(_First1), \
382  __gnu_debug::__base(_Last1), \
383  _First2, _Pred), \
384  _M_message(__gnu_debug::__msg_unsorted_pred) \
385  ._M_iterator(_First1, #_First1) \
386  ._M_iterator(_Last1, #_Last1) \
387  ._M_string(#_Pred))
388 
389 /** Verify that the iterator range [_First, _Last) is partitioned
390  w.r.t. the value _Value. */
391 #define __glibcxx_check_partitioned_lower(_First,_Last,_Value) \
392 __glibcxx_check_valid_range(_First,_Last); \
393 _GLIBCXX_DEBUG_VERIFY(__gnu_debug::__check_partitioned_lower( \
394  __gnu_debug::__base(_First), \
395  __gnu_debug::__base(_Last), _Value), \
396  _M_message(__gnu_debug::__msg_unpartitioned) \
397  ._M_iterator(_First, #_First) \
398  ._M_iterator(_Last, #_Last) \
399  ._M_string(#_Value))
400 
401 #define __glibcxx_check_partitioned_upper(_First,_Last,_Value) \
402 __glibcxx_check_valid_range(_First,_Last); \
403 _GLIBCXX_DEBUG_VERIFY(__gnu_debug::__check_partitioned_upper( \
404  __gnu_debug::__base(_First), \
405  __gnu_debug::__base(_Last), _Value), \
406  _M_message(__gnu_debug::__msg_unpartitioned) \
407  ._M_iterator(_First, #_First) \
408  ._M_iterator(_Last, #_Last) \
409  ._M_string(#_Value))
410 
411 /** Verify that the iterator range [_First, _Last) is partitioned
412  w.r.t. the value _Value and predicate _Pred. */
413 #define __glibcxx_check_partitioned_lower_pred(_First,_Last,_Value,_Pred) \
414 __glibcxx_check_valid_range(_First,_Last); \
415 _GLIBCXX_DEBUG_VERIFY(__gnu_debug::__check_partitioned_lower( \
416  __gnu_debug::__base(_First), \
417  __gnu_debug::__base(_Last), _Value, _Pred), \
418  _M_message(__gnu_debug::__msg_unpartitioned_pred) \
419  ._M_iterator(_First, #_First) \
420  ._M_iterator(_Last, #_Last) \
421  ._M_string(#_Pred) \
422  ._M_string(#_Value))
423 
424 /** Verify that the iterator range [_First, _Last) is partitioned
425  w.r.t. the value _Value and predicate _Pred. */
426 #define __glibcxx_check_partitioned_upper_pred(_First,_Last,_Value,_Pred) \
427 __glibcxx_check_valid_range(_First,_Last); \
428 _GLIBCXX_DEBUG_VERIFY(__gnu_debug::__check_partitioned_upper( \
429  __gnu_debug::__base(_First), \
430  __gnu_debug::__base(_Last), _Value, _Pred), \
431  _M_message(__gnu_debug::__msg_unpartitioned_pred) \
432  ._M_iterator(_First, #_First) \
433  ._M_iterator(_Last, #_Last) \
434  ._M_string(#_Pred) \
435  ._M_string(#_Value))
436 
437 // Verify that the iterator range [_First, _Last) is a heap
438 #define __glibcxx_check_heap(_First,_Last) \
439  _GLIBCXX_DEBUG_VERIFY(std::__is_heap(__gnu_debug::__base(_First), \
440  __gnu_debug::__base(_Last)), \
441  _M_message(__gnu_debug::__msg_not_heap) \
442  ._M_iterator(_First, #_First) \
443  ._M_iterator(_Last, #_Last))
444 
445 /** Verify that the iterator range [_First, _Last) is a heap
446  w.r.t. the predicate _Pred. */
447 #define __glibcxx_check_heap_pred(_First,_Last,_Pred) \
448  _GLIBCXX_DEBUG_VERIFY(std::__is_heap(__gnu_debug::__base(_First), \
449  __gnu_debug::__base(_Last), \
450  _Pred), \
451  _M_message(__gnu_debug::__msg_not_heap_pred) \
452  ._M_iterator(_First, #_First) \
453  ._M_iterator(_Last, #_Last) \
454  ._M_string(#_Pred))
455 
456 // Verify that load factor is positive
457 #define __glibcxx_check_max_load_factor(_F) \
458 _GLIBCXX_DEBUG_VERIFY(_F > 0.0f, \
459  _M_message(__gnu_debug::__msg_valid_load_factor) \
460  ._M_sequence(*this, "this"))
461 
462 #define __glibcxx_check_equal_allocs(_This, _Other) \
463 _GLIBCXX_DEBUG_VERIFY(_This.get_allocator() == _Other.get_allocator(), \
464  _M_message(__gnu_debug::__msg_equal_allocs) \
465  ._M_sequence(_This, "this"))
466 
467 #endif