370 lines
12 KiB
C++
370 lines
12 KiB
C++
// Safe iterator implementation -*- C++ -*-
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// Copyright (C) 2011-2013 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_local_iterator.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_LOCAL_ITERATOR_H
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#define _GLIBCXX_DEBUG_SAFE_LOCAL_ITERATOR_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_unordered_base.h>
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#include <ext/type_traits.h>
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namespace __gnu_debug
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{
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/** \brief Safe iterator wrapper.
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*
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* The class template %_Safe_local_iterator is a wrapper around an
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* iterator that tracks the iterator's movement among sequences and
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* checks that operations performed on the "safe" iterator are
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* legal. In additional to the basic iterator operations (which are
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* validated, and then passed to the underlying iterator),
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* %_Safe_local_iterator has member functions for iterator invalidation,
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* attaching/detaching the iterator from sequences, and querying
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* the iterator's state.
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*/
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template<typename _Iterator, typename _Sequence>
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class _Safe_local_iterator : public _Safe_local_iterator_base
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{
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typedef _Safe_local_iterator _Self;
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typedef typename _Sequence::size_type size_type;
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/// The underlying iterator
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_Iterator _M_current;
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/// The bucket this local iterator belongs to
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size_type _M_bucket;
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/// Determine if this is a constant iterator.
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bool
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_M_constant() const
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{
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typedef typename _Sequence::const_local_iterator const_iterator;
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return std::__are_same<const_iterator, _Safe_local_iterator>::__value;
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}
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typedef std::iterator_traits<_Iterator> _Traits;
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public:
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typedef _Iterator iterator_type;
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typedef typename _Traits::iterator_category iterator_category;
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typedef typename _Traits::value_type value_type;
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typedef typename _Traits::difference_type difference_type;
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typedef typename _Traits::reference reference;
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typedef typename _Traits::pointer pointer;
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/// @post the iterator is singular and unattached
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_Safe_local_iterator() : _M_current() { }
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/**
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* @brief Safe iterator construction from an unsafe iterator and
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* its sequence.
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*
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* @pre @p seq is not NULL
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* @post this is not singular
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*/
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_Safe_local_iterator(const _Iterator& __i, size_type __bucket,
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const _Sequence* __seq)
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: _Safe_local_iterator_base(__seq, _M_constant()), _M_current(__i),
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_M_bucket(__bucket)
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{
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_GLIBCXX_DEBUG_VERIFY(!this->_M_singular(),
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_M_message(__msg_init_singular)
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._M_iterator(*this, "this"));
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}
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/**
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* @brief Copy construction.
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*/
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_Safe_local_iterator(const _Safe_local_iterator& __x)
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: _Safe_local_iterator_base(__x, _M_constant()),
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_M_current(__x._M_current), _M_bucket(__x._M_bucket)
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{
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// DR 408. Is vector<reverse_iterator<char*> > forbidden?
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_GLIBCXX_DEBUG_VERIFY(!__x._M_singular()
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|| __x._M_current == _Iterator(),
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_M_message(__msg_init_copy_singular)
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._M_iterator(*this, "this")
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._M_iterator(__x, "other"));
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}
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/**
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* @brief Converting constructor from a mutable iterator to a
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* constant iterator.
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*/
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template<typename _MutableIterator>
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_Safe_local_iterator(
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const _Safe_local_iterator<_MutableIterator,
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typename __gnu_cxx::__enable_if<std::__are_same<
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_MutableIterator,
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typename _Sequence::local_iterator::iterator_type>::__value,
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_Sequence>::__type>& __x)
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: _Safe_local_iterator_base(__x, _M_constant()),
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_M_current(__x.base()), _M_bucket(__x._M_bucket)
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{
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// DR 408. Is vector<reverse_iterator<char*> > forbidden?
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_GLIBCXX_DEBUG_VERIFY(!__x._M_singular()
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|| __x.base() == _Iterator(),
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_M_message(__msg_init_const_singular)
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._M_iterator(*this, "this")
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._M_iterator(__x, "other"));
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}
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/**
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* @brief Copy assignment.
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*/
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_Safe_local_iterator&
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operator=(const _Safe_local_iterator& __x)
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{
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// DR 408. Is vector<reverse_iterator<char*> > forbidden?
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_GLIBCXX_DEBUG_VERIFY(!__x._M_singular()
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|| __x._M_current == _Iterator(),
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_M_message(__msg_copy_singular)
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._M_iterator(*this, "this")
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._M_iterator(__x, "other"));
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_M_current = __x._M_current;
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_M_bucket = __x._M_bucket;
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this->_M_attach(__x._M_sequence);
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return *this;
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}
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/**
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* @brief Iterator dereference.
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* @pre iterator is dereferenceable
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*/
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reference
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operator*() const
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{
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_GLIBCXX_DEBUG_VERIFY(this->_M_dereferenceable(),
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_M_message(__msg_bad_deref)
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._M_iterator(*this, "this"));
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return *_M_current;
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}
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/**
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* @brief Iterator dereference.
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* @pre iterator is dereferenceable
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* @todo Make this correct w.r.t. iterators that return proxies
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* @todo Use addressof() instead of & operator
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*/
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pointer
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operator->() const
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{
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_GLIBCXX_DEBUG_VERIFY(this->_M_dereferenceable(),
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_M_message(__msg_bad_deref)
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._M_iterator(*this, "this"));
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return &*_M_current;
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}
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// ------ Input iterator requirements ------
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/**
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* @brief Iterator preincrement
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* @pre iterator is incrementable
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*/
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_Safe_local_iterator&
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operator++()
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{
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_GLIBCXX_DEBUG_VERIFY(this->_M_incrementable(),
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_M_message(__msg_bad_inc)
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._M_iterator(*this, "this"));
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++_M_current;
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return *this;
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}
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/**
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* @brief Iterator postincrement
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* @pre iterator is incrementable
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*/
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_Safe_local_iterator
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operator++(int)
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{
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_GLIBCXX_DEBUG_VERIFY(this->_M_incrementable(),
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_M_message(__msg_bad_inc)
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._M_iterator(*this, "this"));
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_Safe_local_iterator __tmp(*this);
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++_M_current;
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return __tmp;
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}
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// ------ Utilities ------
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/**
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* @brief Return the underlying iterator
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*/
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_Iterator
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base() const { return _M_current; }
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/**
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* @brief Return the bucket
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*/
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size_type
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bucket() const { return _M_bucket; }
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/**
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* @brief Conversion to underlying non-debug iterator to allow
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* better interaction with non-debug containers.
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*/
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operator _Iterator() const { return _M_current; }
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/** Attach iterator to the given sequence. */
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void
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_M_attach(_Safe_sequence_base* __seq)
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{ _Safe_iterator_base::_M_attach(__seq, _M_constant()); }
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/** Likewise, but not thread-safe. */
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void
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_M_attach_single(_Safe_sequence_base* __seq)
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{ _Safe_iterator_base::_M_attach_single(__seq, _M_constant()); }
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/// Is the iterator dereferenceable?
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bool
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_M_dereferenceable() const
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{ return !this->_M_singular() && !_M_is_end(); }
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/// Is the iterator incrementable?
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bool
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_M_incrementable() const
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{ return !this->_M_singular() && !_M_is_end(); }
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// Is the iterator range [*this, __rhs) valid?
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template<typename _Other>
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bool
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_M_valid_range(const _Safe_local_iterator<_Other,
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_Sequence>& __rhs) const;
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// The sequence this iterator references.
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const _Sequence*
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_M_get_sequence() const
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{ return static_cast<const _Sequence*>(_M_sequence); }
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/// Is this iterator equal to the sequence's begin() iterator?
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bool _M_is_begin() const
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{ return base() == _M_get_sequence()->_M_base().begin(_M_bucket); }
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/// Is this iterator equal to the sequence's end() iterator?
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bool _M_is_end() const
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{ return base() == _M_get_sequence()->_M_base().end(_M_bucket); }
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/// Is this iterator part of the same bucket as the other one?
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template <typename _Other>
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bool _M_in_same_bucket(const _Safe_local_iterator<_Other,
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_Sequence>& __other) const
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{ return _M_bucket == __other.bucket(); }
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};
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template<typename _IteratorL, typename _IteratorR, typename _Sequence>
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inline bool
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operator==(const _Safe_local_iterator<_IteratorL, _Sequence>& __lhs,
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const _Safe_local_iterator<_IteratorR, _Sequence>& __rhs)
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{
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_GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(),
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_M_message(__msg_iter_compare_bad)
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._M_iterator(__lhs, "lhs")
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._M_iterator(__rhs, "rhs"));
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_GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs),
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_M_message(__msg_compare_different)
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._M_iterator(__lhs, "lhs")
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._M_iterator(__rhs, "rhs"));
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_GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs),
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_M_message(__msg_compare_different)
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._M_iterator(__lhs, "lhs")
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._M_iterator(__rhs, "rhs"));
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_GLIBCXX_DEBUG_VERIFY(__lhs._M_in_same_bucket(__rhs),
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_M_message(__msg_local_iter_compare_bad)
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._M_iterator(__lhs, "lhs")
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._M_iterator(__rhs, "rhs"));
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return __lhs.base() == __rhs.base();
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}
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template<typename _Iterator, typename _Sequence>
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inline bool
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operator==(const _Safe_local_iterator<_Iterator, _Sequence>& __lhs,
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const _Safe_local_iterator<_Iterator, _Sequence>& __rhs)
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{
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_GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(),
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_M_message(__msg_iter_compare_bad)
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._M_iterator(__lhs, "lhs")
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._M_iterator(__rhs, "rhs"));
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_GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs),
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_M_message(__msg_compare_different)
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._M_iterator(__lhs, "lhs")
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._M_iterator(__rhs, "rhs"));
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_GLIBCXX_DEBUG_VERIFY(__lhs._M_in_same_bucket(__rhs),
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_M_message(__msg_local_iter_compare_bad)
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._M_iterator(__lhs, "lhs")
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._M_iterator(__rhs, "rhs"));
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return __lhs.base() == __rhs.base();
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}
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template<typename _IteratorL, typename _IteratorR, typename _Sequence>
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inline bool
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operator!=(const _Safe_local_iterator<_IteratorL, _Sequence>& __lhs,
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const _Safe_local_iterator<_IteratorR, _Sequence>& __rhs)
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{
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_GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(),
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_M_message(__msg_iter_compare_bad)
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._M_iterator(__lhs, "lhs")
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._M_iterator(__rhs, "rhs"));
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_GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs),
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_M_message(__msg_compare_different)
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._M_iterator(__lhs, "lhs")
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._M_iterator(__rhs, "rhs"));
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_GLIBCXX_DEBUG_VERIFY(__lhs._M_in_same_bucket(__rhs),
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_M_message(__msg_local_iter_compare_bad)
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._M_iterator(__lhs, "lhs")
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._M_iterator(__rhs, "rhs"));
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return __lhs.base() != __rhs.base();
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}
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template<typename _Iterator, typename _Sequence>
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inline bool
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operator!=(const _Safe_local_iterator<_Iterator, _Sequence>& __lhs,
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const _Safe_local_iterator<_Iterator, _Sequence>& __rhs)
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{
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_GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(),
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_M_message(__msg_iter_compare_bad)
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._M_iterator(__lhs, "lhs")
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._M_iterator(__rhs, "rhs"));
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_GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs),
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_M_message(__msg_compare_different)
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._M_iterator(__lhs, "lhs")
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._M_iterator(__rhs, "rhs"));
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_GLIBCXX_DEBUG_VERIFY(__lhs._M_in_same_bucket(__rhs),
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_M_message(__msg_local_iter_compare_bad)
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._M_iterator(__lhs, "lhs")
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._M_iterator(__rhs, "rhs"));
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return __lhs.base() != __rhs.base();
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}
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} // namespace __gnu_debug
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#include <debug/safe_local_iterator.tcc>
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#endif
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