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// Safe iterator implementation -*- C++ -*- // Copyright (C) 2011-2013 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_local_iterator.h * This file is a GNU debug extension to the Standard C++ Library. */ #ifndef _GLIBCXX_DEBUG_SAFE_LOCAL_ITERATOR_H #define _GLIBCXX_DEBUG_SAFE_LOCAL_ITERATOR_H 1 #include <debug/debug.h> #include <debug/macros.h> #include <debug/functions.h> #include <debug/safe_unordered_base.h> #include <ext/type_traits.h> namespace __gnu_debug { /** \brief Safe iterator wrapper. * * The class template %_Safe_local_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_local_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_local_iterator : public _Safe_local_iterator_base { typedef _Safe_local_iterator _Self; typedef typename _Sequence::size_type size_type; /// The underlying iterator _Iterator _M_current; /// The bucket this local iterator belongs to size_type _M_bucket; /// Determine if this is a constant iterator. bool _M_constant() const { typedef typename _Sequence::const_local_iterator const_iterator; return std::__are_same<const_iterator, _Safe_local_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_local_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_local_iterator(const _Iterator& __i, size_type __bucket, const _Sequence* __seq) : _Safe_local_iterator_base(__seq, _M_constant()), _M_current(__i), _M_bucket(__bucket) { _GLIBCXX_DEBUG_VERIFY(!this->_M_singular(), _M_message(__msg_init_singular) ._M_iterator(*this, "this")); } /** * @brief Copy construction. */ _Safe_local_iterator(const _Safe_local_iterator& __x) : _Safe_local_iterator_base(__x, _M_constant()), _M_current(__x._M_current), _M_bucket(__x._M_bucket) { // _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")); } /** * @brief Converting constructor from a mutable iterator to a * constant iterator. */ template<typename _MutableIterator> _Safe_local_iterator( const _Safe_local_iterator<_MutableIterator, typename __gnu_cxx::__enable_if<std::__are_same< _MutableIterator, typename _Sequence::local_iterator::iterator_type>::__value, _Sequence>::__type>& __x) : _Safe_local_iterator_base(__x, _M_constant()), _M_current(__x.base()), _M_bucket(__x._M_bucket) { // _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_local_iterator& operator=(const _Safe_local_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; _M_bucket = __x._M_bucket; this->_M_attach(__x._M_sequence); return *this; } /** * @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_local_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_local_iterator operator++(int) { _GLIBCXX_DEBUG_VERIFY(this->_M_incrementable(), _M_message(__msg_bad_inc) ._M_iterator(*this, "this")); _Safe_local_iterator __tmp(*this); ++_M_current; return __tmp; } // ------ Utilities ------ /** * @brief Return the underlying iterator */ _Iterator base() const { return _M_current; } /** * @brief Return the bucket */ size_type bucket() const { return _M_bucket; } /** * @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(); } /// Is the iterator incrementable? bool _M_incrementable() const { return !this->_M_singular() && !_M_is_end(); } // Is the iterator range [*this, __rhs) valid? template<typename _Other> bool _M_valid_range(const _Safe_local_iterator<_Other, _Sequence>& __rhs) const; // The sequence this iterator references. const _Sequence* _M_get_sequence() const { return static_cast<const _Sequence*>(_M_sequence); } /// Is this iterator equal to the sequence's begin() iterator? bool _M_is_begin() const { return base() == _M_get_sequence()->_M_base().begin(_M_bucket); } /// Is this iterator equal to the sequence's end() iterator? bool _M_is_end() const { return base() == _M_get_sequence()->_M_base().end(_M_bucket); } /// Is this iterator part of the same bucket as the other one? template <typename _Other> bool _M_in_same_bucket(const _Safe_local_iterator<_Other, _Sequence>& __other) const { return _M_bucket == __other.bucket(); } }; template<typename _IteratorL, typename _IteratorR, typename _Sequence> inline bool operator==(const _Safe_local_iterator<_IteratorL, _Sequence>& __lhs, const _Safe_local_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")); _GLIBCXX_DEBUG_VERIFY(__lhs._M_can_compare(__rhs), _M_message(__msg_compare_different) ._M_iterator(__lhs, "lhs") ._M_iterator(__rhs, "rhs")); _GLIBCXX_DEBUG_VERIFY(__lhs._M_in_same_bucket(__rhs), _M_message(__msg_local_iter_compare_bad) ._M_iterator(__lhs, "lhs") ._M_iterator(__rhs, "rhs")); return __lhs.base() == __rhs.base(); } template<typename _Iterator, typename _Sequence> inline bool operator==(const _Safe_local_iterator<_Iterator, _Sequence>& __lhs, const _Safe_local_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")); _GLIBCXX_DEBUG_VERIFY(__lhs._M_in_same_bucket(__rhs), _M_message(__msg_local_iter_compare_bad) ._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_local_iterator<_IteratorL, _Sequence>& __lhs, const _Safe_local_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")); _GLIBCXX_DEBUG_VERIFY(__lhs._M_in_same_bucket(__rhs), _M_message(__msg_local_iter_compare_bad) ._M_iterator(__lhs, "lhs") ._M_iterator(__rhs, "rhs")); return __lhs.base() != __rhs.base(); } template<typename _Iterator, typename _Sequence> inline bool operator!=(const _Safe_local_iterator<_Iterator, _Sequence>& __lhs, const _Safe_local_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")); _GLIBCXX_DEBUG_VERIFY(__lhs._M_in_same_bucket(__rhs), _M_message(__msg_local_iter_compare_bad) ._M_iterator(__lhs, "lhs") ._M_iterator(__rhs, "rhs")); return __lhs.base() != __rhs.base(); } } // namespace __gnu_debug #include <debug/safe_local_iterator.tcc> #endif