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// Safe sequence implementation -*- C++ -*-
// Copyright (C) 2003-2022 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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