Edit File: safe_sequence.h
// Safe sequence implementation -*- C++ -*- // Copyright (C) 2003-2018 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_sequence.h * This file is a GNU debug extension to the Standard C++ Library. */ #ifndef _GLIBCXX_DEBUG_SAFE_SEQUENCE_H #define _GLIBCXX_DEBUG_SAFE_SEQUENCE_H 1 #include <debug/assertions.h> #include <debug/macros.h> #include <debug/functions.h> #include <debug/safe_base.h> namespace __gnu_debug { /** A simple function object that returns true if the passed-in * value is not equal to the stored value. It saves typing over * using both bind1st and not_equal. */ template<typename _Type> class _Not_equal_to { _Type __value; public: explicit _Not_equal_to(const _Type& __v) : __value(__v) { } bool operator()(const _Type& __x) const { return __value != __x; } }; /** A simple function object that returns true if the passed-in * value is equal to the stored value. */ template <typename _Type> class _Equal_to { _Type __value; public: explicit _Equal_to(const _Type& __v) : __value(__v) { } bool operator()(const _Type& __x) const { return __value == __x; } }; /** A function object that returns true when the given random access iterator is at least @c n steps away from the given iterator. */ template<typename _Iterator> class _After_nth_from { typedef typename std::iterator_traits<_Iterator>::difference_type difference_type; _Iterator _M_base; difference_type _M_n; public: _After_nth_from(const difference_type& __n, const _Iterator& __base) : _M_base(__base), _M_n(__n) { } bool operator()(const _Iterator& __x) const { return __x - _M_base >= _M_n; } }; /** * @brief Base class for constructing a @a safe sequence type that * tracks iterators that reference it. * * The class template %_Safe_sequence simplifies the construction of * @a safe sequences that track the iterators that reference the * sequence, so that the iterators are notified of changes in the * sequence that may affect their operation, e.g., if the container * invalidates its iterators or is destructed. This class template * may only be used by deriving from it and passing the name of the * derived class as its template parameter via the curiously * recurring template pattern. The derived class must have @c * iterator and @c const_iterator types that are instantiations of * class template _Safe_iterator for this sequence. Iterators will * then be tracked automatically. */ template<typename _Sequence> class _Safe_sequence : public _Safe_sequence_base { public: /** Invalidates all iterators @c x that reference this sequence, are not singular, and for which @c __pred(x) returns @c true. @c __pred will be invoked with the normal iterators nested in the safe ones. */ template<typename _Predicate> void _M_invalidate_if(_Predicate __pred); /** Transfers all iterators @c x that reference @c from sequence, are not singular, and for which @c __pred(x) returns @c true. @c __pred will be invoked with the normal iterators nested in the safe ones. */ template<typename _Predicate> void _M_transfer_from_if(_Safe_sequence& __from, _Predicate __pred); }; /// Like _Safe_sequence but with a special _M_invalidate_all implementation /// not invalidating past-the-end iterators. Used by node based sequence. template<typename _Sequence> class _Safe_node_sequence : public _Safe_sequence<_Sequence> { protected: void _M_invalidate_all() { typedef typename _Sequence::const_iterator _Const_iterator; typedef typename _Const_iterator::iterator_type _Base_const_iterator; typedef __gnu_debug::_Not_equal_to<_Base_const_iterator> _Not_equal; const _Sequence& __seq = *static_cast<_Sequence*>(this); this->_M_invalidate_if(_Not_equal(__seq._M_base().end())); } }; } // namespace __gnu_debug #include <debug/safe_sequence.tcc> #endif
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