diff options
Diffstat (limited to 'libstdc++-v3/include/debug/safe_iterator.h')
| -rw-r--r-- | libstdc++-v3/include/debug/safe_iterator.h | 730 |
1 files changed, 730 insertions, 0 deletions
diff --git a/libstdc++-v3/include/debug/safe_iterator.h b/libstdc++-v3/include/debug/safe_iterator.h new file mode 100644 index 000000000..8d1996b4b --- /dev/null +++ b/libstdc++-v3/include/debug/safe_iterator.h @@ -0,0 +1,730 @@ +// Safe iterator implementation -*- C++ -*- + +// Copyright (C) 2003, 2004, 2005, 2006, 2009, 2010, 2011, 2012 +// 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/safe_iterator.h + * This file is a GNU debug extension to the Standard C++ Library. + */ + +#ifndef _GLIBCXX_DEBUG_SAFE_ITERATOR_H +#define _GLIBCXX_DEBUG_SAFE_ITERATOR_H 1 + +#include <debug/debug.h> +#include <debug/macros.h> +#include <debug/functions.h> +#include <debug/safe_base.h> +#include <bits/stl_pair.h> +#include <bits/stl_iterator_base_types.h> // for _Iter_base +#include <ext/type_traits.h> + +namespace __gnu_debug +{ + /** Helper struct to deal with sequence offering a before_begin + * iterator. + **/ + template <typename _Sequence> + struct _BeforeBeginHelper + { + typedef typename _Sequence::const_iterator _It; + typedef typename _It::iterator_type _BaseIt; + + static bool + _M_Is(_BaseIt __it, const _Sequence* __seq) + { return false; } + }; + + /** Iterators that derive from _Safe_iterator_base but that aren't + * _Safe_iterators can be determined singular or non-singular via + * _Safe_iterator_base. + */ + inline bool + __check_singular_aux(const _Safe_iterator_base* __x) + { return __x->_M_singular(); } + + /** \brief Safe iterator wrapper. + * + * The class template %_Safe_iterator is a wrapper around an + * iterator that tracks the iterator's movement among sequences and + * checks that operations performed on the "safe" iterator are + * legal. In additional to the basic iterator operations (which are + * validated, and then passed to the underlying iterator), + * %_Safe_iterator has member functions for iterator invalidation, + * attaching/detaching the iterator from sequences, and querying + * the iterator's state. + */ + template<typename _Iterator, typename _Sequence> + class _Safe_iterator : public _Safe_iterator_base + { + typedef _Safe_iterator _Self; + + /** The precision to which we can calculate the distance between + * two iterators. + */ + enum _Distance_precision + { + __dp_equality, //< Can compare iterator equality, only + __dp_sign, //< Can determine equality and ordering + __dp_exact //< Can determine distance precisely + }; + + /// The underlying iterator + _Iterator _M_current; + + /// Determine if this is a constant iterator. + bool + _M_constant() const + { + typedef typename _Sequence::const_iterator const_iterator; + return std::__are_same<const_iterator, _Safe_iterator>::__value; + } + + typedef std::iterator_traits<_Iterator> _Traits; + + public: + typedef _Iterator iterator_type; + typedef typename _Traits::iterator_category iterator_category; + typedef typename _Traits::value_type value_type; + typedef typename _Traits::difference_type difference_type; + typedef typename _Traits::reference reference; + typedef typename _Traits::pointer pointer; + + /// @post the iterator is singular and unattached + _Safe_iterator() : _M_current() { } + + /** + * @brief Safe iterator construction from an unsafe iterator and + * its sequence. + * + * @pre @p seq is not NULL + * @post this is not singular + */ + _Safe_iterator(const _Iterator& __i, const _Sequence* __seq) + : _Safe_iterator_base(__seq, _M_constant()), _M_current(__i) + { + _GLIBCXX_DEBUG_VERIFY(! this->_M_singular(), + _M_message(__msg_init_singular) + ._M_iterator(*this, "this")); + } + + /** + * @brief Copy construction. + */ + _Safe_iterator(const _Safe_iterator& __x) + : _Safe_iterator_base(__x, _M_constant()), _M_current(__x._M_current) + { + // _GLIBCXX_RESOLVE_LIB_DEFECTS + // DR 408. Is vector<reverse_iterator<char*> > forbidden? + _GLIBCXX_DEBUG_VERIFY(!__x._M_singular() + || __x._M_current == _Iterator(), + _M_message(__msg_init_copy_singular) + ._M_iterator(*this, "this") + ._M_iterator(__x, "other")); + } + +#ifdef __GXX_EXPERIMENTAL_CXX0X__ + /** + * @brief Move construction. + * @post __x is singular and unattached + */ + _Safe_iterator(_Safe_iterator&& __x) : _M_current() + { + _GLIBCXX_DEBUG_VERIFY(!__x._M_singular() + || __x._M_current == _Iterator(), + _M_message(__msg_init_copy_singular) + ._M_iterator(*this, "this") + ._M_iterator(__x, "other")); + std::swap(_M_current, __x._M_current); + this->_M_attach(__x._M_sequence); + __x._M_detach(); + } +#endif + + /** + * @brief Converting constructor from a mutable iterator to a + * constant iterator. + */ + template<typename _MutableIterator> + _Safe_iterator( + const _Safe_iterator<_MutableIterator, + typename __gnu_cxx::__enable_if<(std::__are_same<_MutableIterator, + typename _Sequence::iterator::iterator_type>::__value), + _Sequence>::__type>& __x) + : _Safe_iterator_base(__x, _M_constant()), _M_current(__x.base()) + { + // _GLIBCXX_RESOLVE_LIB_DEFECTS + // DR 408. Is vector<reverse_iterator<char*> > forbidden? + _GLIBCXX_DEBUG_VERIFY(!__x._M_singular() + || __x.base() == _Iterator(), + _M_message(__msg_init_const_singular) + ._M_iterator(*this, "this") + ._M_iterator(__x, "other")); + } + + /** + * @brief Copy assignment. + */ + _Safe_iterator& + operator=(const _Safe_iterator& __x) + { + // _GLIBCXX_RESOLVE_LIB_DEFECTS + // DR 408. Is vector<reverse_iterator<char*> > forbidden? + _GLIBCXX_DEBUG_VERIFY(!__x._M_singular() + || __x._M_current == _Iterator(), + _M_message(__msg_copy_singular) + ._M_iterator(*this, "this") + ._M_iterator(__x, "other")); + _M_current = __x._M_current; + this->_M_attach(__x._M_sequence); + return *this; + } + +#ifdef __GXX_EXPERIMENTAL_CXX0X__ + /** + * @brief Move assignment. + * @post __x is singular and unattached + */ + _Safe_iterator& + operator=(_Safe_iterator&& __x) + { + _GLIBCXX_DEBUG_VERIFY(!__x._M_singular() + || __x._M_current == _Iterator(), + _M_message(__msg_copy_singular) + ._M_iterator(*this, "this") + ._M_iterator(__x, "other")); + _M_current = __x._M_current; + _M_attach(__x._M_sequence); + __x._M_detach(); + __x._M_current = _Iterator(); + return *this; + } +#endif + + /** + * @brief Iterator dereference. + * @pre iterator is dereferenceable + */ + reference + operator*() const + { + _GLIBCXX_DEBUG_VERIFY(this->_M_dereferenceable(), + _M_message(__msg_bad_deref) + ._M_iterator(*this, "this")); + return *_M_current; + } + + /** + * @brief Iterator dereference. + * @pre iterator is dereferenceable + * @todo Make this correct w.r.t. iterators that return proxies + * @todo Use addressof() instead of & operator + */ + pointer + operator->() const + { + _GLIBCXX_DEBUG_VERIFY(this->_M_dereferenceable(), + _M_message(__msg_bad_deref) + ._M_iterator(*this, "this")); + return &*_M_current; + } + + // ------ Input iterator requirements ------ + /** + * @brief Iterator preincrement + * @pre iterator is incrementable + */ + _Safe_iterator& + operator++() + { + _GLIBCXX_DEBUG_VERIFY(this->_M_incrementable(), + _M_message(__msg_bad_inc) + ._M_iterator(*this, "this")); + ++_M_current; + return *this; + } + + /** + * @brief Iterator postincrement + * @pre iterator is incrementable + */ + _Safe_iterator + operator++(int) + { + _GLIBCXX_DEBUG_VERIFY(this->_M_incrementable(), + _M_message(__msg_bad_inc) + ._M_iterator(*this, "this")); + _Safe_iterator __tmp(*this); + ++_M_current; + return __tmp; + } + + // ------ Bidirectional iterator requirements ------ + /** + * @brief Iterator predecrement + * @pre iterator is decrementable + */ + _Safe_iterator& + operator--() + { + _GLIBCXX_DEBUG_VERIFY(this->_M_decrementable(), + _M_message(__msg_bad_dec) + ._M_iterator(*this, "this")); + --_M_current; + return *this; + } + + /** + * @brief Iterator postdecrement + * @pre iterator is decrementable + */ + _Safe_iterator + operator--(int) + { + _GLIBCXX_DEBUG_VERIFY(this->_M_decrementable(), + _M_message(__msg_bad_dec) + ._M_iterator(*this, "this")); + _Safe_iterator __tmp(*this); + --_M_current; + return __tmp; + } + + // ------ Random access iterator requirements ------ + reference + operator[](const difference_type& __n) const + { + _GLIBCXX_DEBUG_VERIFY(this->_M_can_advance(__n) + && this->_M_can_advance(__n+1), + _M_message(__msg_iter_subscript_oob) + ._M_iterator(*this)._M_integer(__n)); + + return _M_current[__n]; + } + + _Safe_iterator& + operator+=(const difference_type& __n) + { + _GLIBCXX_DEBUG_VERIFY(this->_M_can_advance(__n), + _M_message(__msg_advance_oob) + ._M_iterator(*this)._M_integer(__n)); + _M_current += __n; + return *this; + } + + _Safe_iterator + operator+(const difference_type& __n) const + { + _Safe_iterator __tmp(*this); + __tmp += __n; + return __tmp; + } + + _Safe_iterator& + operator-=(const difference_type& __n) + { + _GLIBCXX_DEBUG_VERIFY(this->_M_can_advance(-__n), + _M_message(__msg_retreat_oob) + ._M_iterator(*this)._M_integer(__n)); + _M_current += -__n; + return *this; + } + + _Safe_iterator + operator-(const difference_type& __n) const + { + _Safe_iterator __tmp(*this); + __tmp -= __n; + return __tmp; + } + + // ------ Utilities ------ + /** + * @brief Return the underlying iterator + */ + _Iterator + base() const { return _M_current; } + + /** + * @brief Conversion to underlying non-debug iterator to allow + * better interaction with non-debug containers. + */ + operator _Iterator() const { return _M_current; } + + /** Attach iterator to the given sequence. */ + void + _M_attach(_Safe_sequence_base* __seq) + { + _Safe_iterator_base::_M_attach(__seq, _M_constant()); + } + + /** Likewise, but not thread-safe. */ + void + _M_attach_single(_Safe_sequence_base* __seq) + { + _Safe_iterator_base::_M_attach_single(__seq, _M_constant()); + } + + /// Is the iterator dereferenceable? + bool + _M_dereferenceable() const + { return !this->_M_singular() && !_M_is_end() && !_M_is_before_begin(); } + + /// Is the iterator before a dereferenceable one? + bool + _M_before_dereferenceable() const + { + _Self __it = *this; + return __it._M_incrementable() && (++__it)._M_dereferenceable(); + } + + /// Is the iterator incrementable? + bool + _M_incrementable() const + { return !this->_M_singular() && !_M_is_end(); } + + // Is the iterator decrementable? + bool + _M_decrementable() const { return !_M_singular() && !_M_is_begin(); } + + // Can we advance the iterator @p __n steps (@p __n may be negative) + bool + _M_can_advance(const difference_type& __n) const; + + // Is the iterator range [*this, __rhs) valid? + template<typename _Other> + bool + _M_valid_range(const _Safe_iterator<_Other, _Sequence>& __rhs) const; + + // The sequence this iterator references. + const _Sequence* + _M_get_sequence() const + { return static_cast<const _Sequence*>(_M_sequence); } + + /** Determine the distance between two iterators with some known + * precision. + */ + template<typename _Iterator1, typename _Iterator2> + static std::pair<difference_type, _Distance_precision> + _M_get_distance(const _Iterator1& __lhs, const _Iterator2& __rhs) + { + typedef typename std::iterator_traits<_Iterator1>::iterator_category + _Category; + return _M_get_distance(__lhs, __rhs, _Category()); + } + + template<typename _Iterator1, typename _Iterator2> + static std::pair<difference_type, _Distance_precision> + _M_get_distance(const _Iterator1& __lhs, const _Iterator2& __rhs, + std::random_access_iterator_tag) + { return std::make_pair(__rhs - __lhs, __dp_exact); } + + template<typename _Iterator1, typename _Iterator2> + static std::pair<difference_type, _Distance_precision> + _M_get_distance(const _Iterator1& __lhs, const _Iterator2& __rhs, + std::forward_iterator_tag) + { return std::make_pair(__lhs == __rhs? 0 : 1, __dp_equality); } + + /// Is this iterator equal to the sequence's begin() iterator? + bool _M_is_begin() const + { return base() == _M_get_sequence()->_M_base().begin(); } + + /// Is this iterator equal to the sequence's end() iterator? + bool _M_is_end() const + { return base() == _M_get_sequence()->_M_base().end(); } + + /// Is this iterator equal to the sequence's before_begin() iterator if + /// any? + bool _M_is_before_begin() const + { + return _BeforeBeginHelper<_Sequence>::_M_Is(base(), _M_get_sequence()); + } + }; + + template<typename _IteratorL, typename _IteratorR, typename _Sequence> + inline bool + operator==(const _Safe_iterator<_IteratorL, _Sequence>& __lhs, + const _Safe_iterator<_IteratorR, _Sequence>& __rhs) + { + _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(), + _M_message(__msg_iter_compare_bad) + ._M_iterator(__lhs, "lhs") + ._M_iterator(__rhs, "rhs")); + _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs), + _M_message(__msg_compare_different) + ._M_iterator(__lhs, "lhs") + ._M_iterator(__rhs, "rhs")); + return __lhs.base() == __rhs.base(); + } + + template<typename _Iterator, typename _Sequence> + inline bool + operator==(const _Safe_iterator<_Iterator, _Sequence>& __lhs, + const _Safe_iterator<_Iterator, _Sequence>& __rhs) + { + _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(), + _M_message(__msg_iter_compare_bad) + ._M_iterator(__lhs, "lhs") + ._M_iterator(__rhs, "rhs")); + _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs), + _M_message(__msg_compare_different) + ._M_iterator(__lhs, "lhs") + ._M_iterator(__rhs, "rhs")); + return __lhs.base() == __rhs.base(); + } + + template<typename _IteratorL, typename _IteratorR, typename _Sequence> + inline bool + operator!=(const _Safe_iterator<_IteratorL, _Sequence>& __lhs, + const _Safe_iterator<_IteratorR, _Sequence>& __rhs) + { + _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(), + _M_message(__msg_iter_compare_bad) + ._M_iterator(__lhs, "lhs") + ._M_iterator(__rhs, "rhs")); + _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs), + _M_message(__msg_compare_different) + ._M_iterator(__lhs, "lhs") + ._M_iterator(__rhs, "rhs")); + return __lhs.base() != __rhs.base(); + } + + template<typename _Iterator, typename _Sequence> + inline bool + operator!=(const _Safe_iterator<_Iterator, _Sequence>& __lhs, + const _Safe_iterator<_Iterator, _Sequence>& __rhs) + { + _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(), + _M_message(__msg_iter_compare_bad) + ._M_iterator(__lhs, "lhs") + ._M_iterator(__rhs, "rhs")); + _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs), + _M_message(__msg_compare_different) + ._M_iterator(__lhs, "lhs") + ._M_iterator(__rhs, "rhs")); + return __lhs.base() != __rhs.base(); + } + + template<typename _IteratorL, typename _IteratorR, typename _Sequence> + inline bool + operator<(const _Safe_iterator<_IteratorL, _Sequence>& __lhs, + const _Safe_iterator<_IteratorR, _Sequence>& __rhs) + { + _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(), + _M_message(__msg_iter_order_bad) + ._M_iterator(__lhs, "lhs") + ._M_iterator(__rhs, "rhs")); + _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs), + _M_message(__msg_order_different) + ._M_iterator(__lhs, "lhs") + ._M_iterator(__rhs, "rhs")); + return __lhs.base() < __rhs.base(); + } + + template<typename _Iterator, typename _Sequence> + inline bool + operator<(const _Safe_iterator<_Iterator, _Sequence>& __lhs, + const _Safe_iterator<_Iterator, _Sequence>& __rhs) + { + _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(), + _M_message(__msg_iter_order_bad) + ._M_iterator(__lhs, "lhs") + ._M_iterator(__rhs, "rhs")); + _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs), + _M_message(__msg_order_different) + ._M_iterator(__lhs, "lhs") + ._M_iterator(__rhs, "rhs")); + return __lhs.base() < __rhs.base(); + } + + template<typename _IteratorL, typename _IteratorR, typename _Sequence> + inline bool + operator<=(const _Safe_iterator<_IteratorL, _Sequence>& __lhs, + const _Safe_iterator<_IteratorR, _Sequence>& __rhs) + { + _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(), + _M_message(__msg_iter_order_bad) + ._M_iterator(__lhs, "lhs") + ._M_iterator(__rhs, "rhs")); + _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs), + _M_message(__msg_order_different) + ._M_iterator(__lhs, "lhs") + ._M_iterator(__rhs, "rhs")); + return __lhs.base() <= __rhs.base(); + } + + template<typename _Iterator, typename _Sequence> + inline bool + operator<=(const _Safe_iterator<_Iterator, _Sequence>& __lhs, + const _Safe_iterator<_Iterator, _Sequence>& __rhs) + { + _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(), + _M_message(__msg_iter_order_bad) + ._M_iterator(__lhs, "lhs") + ._M_iterator(__rhs, "rhs")); + _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs), + _M_message(__msg_order_different) + ._M_iterator(__lhs, "lhs") + ._M_iterator(__rhs, "rhs")); + return __lhs.base() <= __rhs.base(); + } + + template<typename _IteratorL, typename _IteratorR, typename _Sequence> + inline bool + operator>(const _Safe_iterator<_IteratorL, _Sequence>& __lhs, + const _Safe_iterator<_IteratorR, _Sequence>& __rhs) + { + _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(), + _M_message(__msg_iter_order_bad) + ._M_iterator(__lhs, "lhs") + ._M_iterator(__rhs, "rhs")); + _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs), + _M_message(__msg_order_different) + ._M_iterator(__lhs, "lhs") + ._M_iterator(__rhs, "rhs")); + return __lhs.base() > __rhs.base(); + } + + template<typename _Iterator, typename _Sequence> + inline bool + operator>(const _Safe_iterator<_Iterator, _Sequence>& __lhs, + const _Safe_iterator<_Iterator, _Sequence>& __rhs) + { + _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(), + _M_message(__msg_iter_order_bad) + ._M_iterator(__lhs, "lhs") + ._M_iterator(__rhs, "rhs")); + _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs), + _M_message(__msg_order_different) + ._M_iterator(__lhs, "lhs") + ._M_iterator(__rhs, "rhs")); + return __lhs.base() > __rhs.base(); + } + + template<typename _IteratorL, typename _IteratorR, typename _Sequence> + inline bool + operator>=(const _Safe_iterator<_IteratorL, _Sequence>& __lhs, + const _Safe_iterator<_IteratorR, _Sequence>& __rhs) + { + _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(), + _M_message(__msg_iter_order_bad) + ._M_iterator(__lhs, "lhs") + ._M_iterator(__rhs, "rhs")); + _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs), + _M_message(__msg_order_different) + ._M_iterator(__lhs, "lhs") + ._M_iterator(__rhs, "rhs")); + return __lhs.base() >= __rhs.base(); + } + + template<typename _Iterator, typename _Sequence> + inline bool + operator>=(const _Safe_iterator<_Iterator, _Sequence>& __lhs, + const _Safe_iterator<_Iterator, _Sequence>& __rhs) + { + _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(), + _M_message(__msg_iter_order_bad) + ._M_iterator(__lhs, "lhs") + ._M_iterator(__rhs, "rhs")); + _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs), + _M_message(__msg_order_different) + ._M_iterator(__lhs, "lhs") + ._M_iterator(__rhs, "rhs")); + return __lhs.base() >= __rhs.base(); + } + + // _GLIBCXX_RESOLVE_LIB_DEFECTS + // According to the resolution of DR179 not only the various comparison + // operators but also operator- must accept mixed iterator/const_iterator + // parameters. + template<typename _IteratorL, typename _IteratorR, typename _Sequence> + inline typename _Safe_iterator<_IteratorL, _Sequence>::difference_type + operator-(const _Safe_iterator<_IteratorL, _Sequence>& __lhs, + const _Safe_iterator<_IteratorR, _Sequence>& __rhs) + { + _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(), + _M_message(__msg_distance_bad) + ._M_iterator(__lhs, "lhs") + ._M_iterator(__rhs, "rhs")); + _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs), + _M_message(__msg_distance_different) + ._M_iterator(__lhs, "lhs") + ._M_iterator(__rhs, "rhs")); + return __lhs.base() - __rhs.base(); + } + + template<typename _Iterator, typename _Sequence> + inline typename _Safe_iterator<_Iterator, _Sequence>::difference_type + operator-(const _Safe_iterator<_Iterator, _Sequence>& __lhs, + const _Safe_iterator<_Iterator, _Sequence>& __rhs) + { + _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(), + _M_message(__msg_distance_bad) + ._M_iterator(__lhs, "lhs") + ._M_iterator(__rhs, "rhs")); + _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs), + _M_message(__msg_distance_different) + ._M_iterator(__lhs, "lhs") + ._M_iterator(__rhs, "rhs")); + return __lhs.base() - __rhs.base(); + } + + template<typename _Iterator, typename _Sequence> + inline _Safe_iterator<_Iterator, _Sequence> + operator+(typename _Safe_iterator<_Iterator,_Sequence>::difference_type __n, + const _Safe_iterator<_Iterator, _Sequence>& __i) + { return __i + __n; } + + // Helper struct to detect random access safe iterators. + template<typename _Iterator> + struct __is_safe_random_iterator + { + enum { __value = 0 }; + typedef std::__false_type __type; + }; + + template<typename _Iterator, typename _Sequence> + struct __is_safe_random_iterator<_Safe_iterator<_Iterator, _Sequence> > + : std::__are_same<std::random_access_iterator_tag, + typename std::iterator_traits<_Iterator>:: + iterator_category> + { }; + + template<typename _Iterator> + struct _Siter_base + : std::_Iter_base<_Iterator, __is_safe_random_iterator<_Iterator>::__value> + { }; + + /** Helper function to extract base iterator of random access safe iterator + in order to reduce performance impact of debug mode. Limited to random + access iterator because it is the only category for which it is possible + to check for correct iterators order in the __valid_range function + thanks to the < operator. + */ + template<typename _Iterator> + inline typename _Siter_base<_Iterator>::iterator_type + __base(_Iterator __it) + { return _Siter_base<_Iterator>::_S_base(__it); } +} // namespace __gnu_debug + +#include <debug/safe_iterator.tcc> + +#endif |