--- /dev/null
+// Debugging support implementation -*- C++ -*-
+
+// Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009
+// Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file debug/functions.h
+ * This file is a GNU debug extension to the Standard C++ Library.
+ */
+
+#ifndef _GLIBCXX_DEBUG_FUNCTIONS_H
+#define _GLIBCXX_DEBUG_FUNCTIONS_H 1
+
+#include <bits/c++config.h>
+#include <cstddef> // for ptrdiff_t
+#include <bits/stl_iterator_base_types.h> // for iterator_traits, categories
+#include <bits/cpp_type_traits.h> // for __is_integer
+
+namespace __gnu_debug
+{
+ template<typename _Iterator, typename _Sequence>
+ class _Safe_iterator;
+
+ // An arbitrary iterator pointer is not singular.
+ inline bool
+ __check_singular_aux(const void*) { return false; }
+
+ // We may have an iterator that derives from _Safe_iterator_base but isn't
+ // a _Safe_iterator.
+ template<typename _Iterator>
+ inline bool
+ __check_singular(_Iterator& __x)
+ { return __check_singular_aux(&__x); }
+
+ /** Non-NULL pointers are nonsingular. */
+ template<typename _Tp>
+ inline bool
+ __check_singular(const _Tp* __ptr)
+ { return __ptr == 0; }
+
+ /** Safe iterators know if they are singular. */
+ template<typename _Iterator, typename _Sequence>
+ inline bool
+ __check_singular(const _Safe_iterator<_Iterator, _Sequence>& __x)
+ { return __x._M_singular(); }
+
+ /** Assume that some arbitrary iterator is dereferenceable, because we
+ can't prove that it isn't. */
+ template<typename _Iterator>
+ inline bool
+ __check_dereferenceable(_Iterator&)
+ { return true; }
+
+ /** Non-NULL pointers are dereferenceable. */
+ template<typename _Tp>
+ inline bool
+ __check_dereferenceable(const _Tp* __ptr)
+ { return __ptr; }
+
+ /** Safe iterators know if they are singular. */
+ template<typename _Iterator, typename _Sequence>
+ inline bool
+ __check_dereferenceable(const _Safe_iterator<_Iterator, _Sequence>& __x)
+ { return __x._M_dereferenceable(); }
+
+ /** If the distance between two random access iterators is
+ * nonnegative, assume the range is valid.
+ */
+ template<typename _RandomAccessIterator>
+ inline bool
+ __valid_range_aux2(const _RandomAccessIterator& __first,
+ const _RandomAccessIterator& __last,
+ std::random_access_iterator_tag)
+ { return __last - __first >= 0; }
+
+ /** Can't test for a valid range with input iterators, because
+ * iteration may be destructive. So we just assume that the range
+ * is valid.
+ */
+ template<typename _InputIterator>
+ inline bool
+ __valid_range_aux2(const _InputIterator&, const _InputIterator&,
+ std::input_iterator_tag)
+ { return true; }
+
+ /** We say that integral types for a valid range, and defer to other
+ * routines to realize what to do with integral types instead of
+ * iterators.
+ */
+ template<typename _Integral>
+ inline bool
+ __valid_range_aux(const _Integral&, const _Integral&, std::__true_type)
+ { return true; }
+
+ /** We have iterators, so figure out what kind of iterators that are
+ * to see if we can check the range ahead of time.
+ */
+ template<typename _InputIterator>
+ inline bool
+ __valid_range_aux(const _InputIterator& __first,
+ const _InputIterator& __last, std::__false_type)
+ {
+ typedef typename std::iterator_traits<_InputIterator>::iterator_category
+ _Category;
+ return __valid_range_aux2(__first, __last, _Category());
+ }
+
+ /** Don't know what these iterators are, or if they are even
+ * iterators (we may get an integral type for InputIterator), so
+ * see if they are integral and pass them on to the next phase
+ * otherwise.
+ */
+ template<typename _InputIterator>
+ inline bool
+ __valid_range(const _InputIterator& __first, const _InputIterator& __last)
+ {
+ typedef typename std::__is_integer<_InputIterator>::__type _Integral;
+ return __valid_range_aux(__first, __last, _Integral());
+ }
+
+ /** Safe iterators know how to check if they form a valid range. */
+ template<typename _Iterator, typename _Sequence>
+ inline bool
+ __valid_range(const _Safe_iterator<_Iterator, _Sequence>& __first,
+ const _Safe_iterator<_Iterator, _Sequence>& __last)
+ { return __first._M_valid_range(__last); }
+
+ /* Checks that [first, last) is a valid range, and then returns
+ * __first. This routine is useful when we can't use a separate
+ * assertion statement because, e.g., we are in a constructor.
+ */
+ template<typename _InputIterator>
+ inline _InputIterator
+ __check_valid_range(const _InputIterator& __first,
+ const _InputIterator& __last
+ __attribute__((__unused__)))
+ {
+ _GLIBCXX_DEBUG_ASSERT(__valid_range(__first, __last));
+ return __first;
+ }
+
+ /** Checks that __s is non-NULL or __n == 0, and then returns __s. */
+ template<typename _CharT, typename _Integer>
+ inline const _CharT*
+ __check_string(const _CharT* __s,
+ const _Integer& __n __attribute__((__unused__)))
+ {
+#ifdef _GLIBCXX_DEBUG_PEDANTIC
+ _GLIBCXX_DEBUG_ASSERT(__s != 0 || __n == 0);
+#endif
+ return __s;
+ }
+
+ /** Checks that __s is non-NULL and then returns __s. */
+ template<typename _CharT>
+ inline const _CharT*
+ __check_string(const _CharT* __s)
+ {
+#ifdef _GLIBCXX_DEBUG_PEDANTIC
+ _GLIBCXX_DEBUG_ASSERT(__s != 0);
+#endif
+ return __s;
+ }
+
+ // Can't check if an input iterator sequence is sorted, because we
+ // can't step through the sequence.
+ template<typename _InputIterator>
+ inline bool
+ __check_sorted_aux(const _InputIterator&, const _InputIterator&,
+ std::input_iterator_tag)
+ { return true; }
+
+ // Can verify if a forward iterator sequence is in fact sorted using
+ // std::__is_sorted
+ template<typename _ForwardIterator>
+ inline bool
+ __check_sorted_aux(_ForwardIterator __first, _ForwardIterator __last,
+ std::forward_iterator_tag)
+ {
+ if (__first == __last)
+ return true;
+
+ _ForwardIterator __next = __first;
+ for (++__next; __next != __last; __first = __next, ++__next)
+ if (*__next < *__first)
+ return false;
+
+ return true;
+ }
+
+ // Can't check if an input iterator sequence is sorted, because we can't step
+ // through the sequence.
+ template<typename _InputIterator, typename _Predicate>
+ inline bool
+ __check_sorted_aux(const _InputIterator&, const _InputIterator&,
+ _Predicate, std::input_iterator_tag)
+ { return true; }
+
+ // Can verify if a forward iterator sequence is in fact sorted using
+ // std::__is_sorted
+ template<typename _ForwardIterator, typename _Predicate>
+ inline bool
+ __check_sorted_aux(_ForwardIterator __first, _ForwardIterator __last,
+ _Predicate __pred, std::forward_iterator_tag)
+ {
+ if (__first == __last)
+ return true;
+
+ _ForwardIterator __next = __first;
+ for (++__next; __next != __last; __first = __next, ++__next)
+ if (__pred(*__next, *__first))
+ return false;
+
+ return true;
+ }
+
+ // Determine if a sequence is sorted.
+ template<typename _InputIterator>
+ inline bool
+ __check_sorted(const _InputIterator& __first, const _InputIterator& __last)
+ {
+ typedef typename std::iterator_traits<_InputIterator>::iterator_category
+ _Category;
+
+ // Verify that the < operator for elements in the sequence is a
+ // StrictWeakOrdering by checking that it is irreflexive.
+ _GLIBCXX_DEBUG_ASSERT(__first == __last || !(*__first < *__first));
+
+ return __check_sorted_aux(__first, __last, _Category());
+ }
+
+ template<typename _InputIterator, typename _Predicate>
+ inline bool
+ __check_sorted(const _InputIterator& __first, const _InputIterator& __last,
+ _Predicate __pred)
+ {
+ typedef typename std::iterator_traits<_InputIterator>::iterator_category
+ _Category;
+
+ // Verify that the predicate is StrictWeakOrdering by checking that it
+ // is irreflexive.
+ _GLIBCXX_DEBUG_ASSERT(__first == __last || !__pred(*__first, *__first));
+
+ return __check_sorted_aux(__first, __last, __pred, _Category());
+ }
+
+ template<typename _InputIterator>
+ inline bool
+ __check_sorted_set_aux(const _InputIterator& __first,
+ const _InputIterator& __last,
+ std::__true_type)
+ { return __check_sorted(__first, __last); }
+
+ template<typename _InputIterator>
+ inline bool
+ __check_sorted_set_aux(const _InputIterator&,
+ const _InputIterator&,
+ std::__false_type)
+ { return true; }
+
+ template<typename _InputIterator, typename _Predicate>
+ inline bool
+ __check_sorted_set_aux(const _InputIterator& __first,
+ const _InputIterator& __last,
+ _Predicate __pred, std::__true_type)
+ { return __check_sorted(__first, __last, __pred); }
+
+ template<typename _InputIterator, typename _Predicate>
+ inline bool
+ __check_sorted_set_aux(const _InputIterator&,
+ const _InputIterator&, _Predicate,
+ std::__false_type)
+ { return true; }
+
+ // ... special variant used in std::merge, std::includes, std::set_*.
+ template<typename _InputIterator1, typename _InputIterator2>
+ inline bool
+ __check_sorted_set(const _InputIterator1& __first,
+ const _InputIterator1& __last,
+ const _InputIterator2&)
+ {
+ typedef typename std::iterator_traits<_InputIterator1>::value_type
+ _ValueType1;
+ typedef typename std::iterator_traits<_InputIterator2>::value_type
+ _ValueType2;
+
+ typedef typename std::__are_same<_ValueType1, _ValueType2>::__type
+ _SameType;
+ return __check_sorted_set_aux(__first, __last, _SameType());
+ }
+
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _Predicate>
+ inline bool
+ __check_sorted_set(const _InputIterator1& __first,
+ const _InputIterator1& __last,
+ const _InputIterator2&, _Predicate __pred)
+ {
+ typedef typename std::iterator_traits<_InputIterator1>::value_type
+ _ValueType1;
+ typedef typename std::iterator_traits<_InputIterator2>::value_type
+ _ValueType2;
+
+ typedef typename std::__are_same<_ValueType1, _ValueType2>::__type
+ _SameType;
+ return __check_sorted_set_aux(__first, __last, __pred, _SameType());
+ }
+
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 270. Binary search requirements overly strict
+ // Determine if a sequence is partitioned w.r.t. this element.
+ template<typename _ForwardIterator, typename _Tp>
+ inline bool
+ __check_partitioned_lower(_ForwardIterator __first,
+ _ForwardIterator __last, const _Tp& __value)
+ {
+ while (__first != __last && *__first < __value)
+ ++__first;
+ while (__first != __last && !(*__first < __value))
+ ++__first;
+ return __first == __last;
+ }
+
+ template<typename _ForwardIterator, typename _Tp>
+ inline bool
+ __check_partitioned_upper(_ForwardIterator __first,
+ _ForwardIterator __last, const _Tp& __value)
+ {
+ while (__first != __last && !(__value < *__first))
+ ++__first;
+ while (__first != __last && __value < *__first)
+ ++__first;
+ return __first == __last;
+ }
+
+ // Determine if a sequence is partitioned w.r.t. this element.
+ template<typename _ForwardIterator, typename _Tp, typename _Pred>
+ inline bool
+ __check_partitioned_lower(_ForwardIterator __first,
+ _ForwardIterator __last, const _Tp& __value,
+ _Pred __pred)
+ {
+ while (__first != __last && bool(__pred(*__first, __value)))
+ ++__first;
+ while (__first != __last && !bool(__pred(*__first, __value)))
+ ++__first;
+ return __first == __last;
+ }
+
+ template<typename _ForwardIterator, typename _Tp, typename _Pred>
+ inline bool
+ __check_partitioned_upper(_ForwardIterator __first,
+ _ForwardIterator __last, const _Tp& __value,
+ _Pred __pred)
+ {
+ while (__first != __last && !bool(__pred(__value, *__first)))
+ ++__first;
+ while (__first != __last && bool(__pred(__value, *__first)))
+ ++__first;
+ return __first == __last;
+ }
+} // namespace __gnu_debug
+
+#endif
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