135 lines
4.4 KiB
C++
135 lines
4.4 KiB
C++
// Safe sequence implementation -*- C++ -*-
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// Copyright (C) 2003-2013 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file debug/safe_sequence.h
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* This file is a GNU debug extension to the Standard C++ Library.
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*/
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#ifndef _GLIBCXX_DEBUG_SAFE_SEQUENCE_H
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#define _GLIBCXX_DEBUG_SAFE_SEQUENCE_H 1
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#include <debug/debug.h>
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#include <debug/macros.h>
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#include <debug/functions.h>
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#include <debug/safe_base.h>
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namespace __gnu_debug
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{
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template<typename _Iterator, typename _Sequence>
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class _Safe_iterator;
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/** A simple function object that returns true if the passed-in
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* value is not equal to the stored value. It saves typing over
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* using both bind1st and not_equal.
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*/
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template<typename _Type>
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class _Not_equal_to
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{
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_Type __value;
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public:
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explicit _Not_equal_to(const _Type& __v) : __value(__v) { }
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bool
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operator()(const _Type& __x) const
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{ return __value != __x; }
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};
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/** A simple function object that returns true if the passed-in
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* value is equal to the stored value. */
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template <typename _Type>
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class _Equal_to
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{
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_Type __value;
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public:
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explicit _Equal_to(const _Type& __v) : __value(__v) { }
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bool
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operator()(const _Type& __x) const
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{ return __value == __x; }
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};
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/** A function object that returns true when the given random access
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iterator is at least @c n steps away from the given iterator. */
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template<typename _Iterator>
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class _After_nth_from
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{
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typedef typename std::iterator_traits<_Iterator>::difference_type
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difference_type;
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_Iterator _M_base;
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difference_type _M_n;
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public:
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_After_nth_from(const difference_type& __n, const _Iterator& __base)
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: _M_base(__base), _M_n(__n) { }
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bool
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operator()(const _Iterator& __x) const
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{ return __x - _M_base >= _M_n; }
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};
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/**
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* @brief Base class for constructing a @a safe sequence type that
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* tracks iterators that reference it.
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*
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* The class template %_Safe_sequence simplifies the construction of
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* @a safe sequences that track the iterators that reference the
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* sequence, so that the iterators are notified of changes in the
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* sequence that may affect their operation, e.g., if the container
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* invalidates its iterators or is destructed. This class template
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* may only be used by deriving from it and passing the name of the
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* derived class as its template parameter via the curiously
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* recurring template pattern. The derived class must have @c
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* iterator and @c const_iterator types that are instantiations of
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* class template _Safe_iterator for this sequence. Iterators will
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* then be tracked automatically.
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*/
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template<typename _Sequence>
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class _Safe_sequence : public _Safe_sequence_base
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{
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public:
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/** Invalidates all iterators @c x that reference this sequence,
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are not singular, and for which @c __pred(x) returns @c
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true. @c __pred will be invoked with the normal iterators nested
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in the safe ones. */
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template<typename _Predicate>
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void
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_M_invalidate_if(_Predicate __pred);
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/** Transfers all iterators @c x that reference @c from sequence,
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are not singular, and for which @c __pred(x) returns @c
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true. @c __pred will be invoked with the normal iterators nested
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in the safe ones. */
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template<typename _Predicate>
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void
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_M_transfer_from_if(_Safe_sequence& __from, _Predicate __pred);
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};
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} // namespace __gnu_debug
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#include <debug/safe_sequence.tcc>
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#endif
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