d28d43815b
2011-07-20 Paolo Carlini <paolo.carlini@oracle.com> * include/debug/safe_local_iterator.h (_Safe_local_iterator<>:: _Safe_local_iterator(const _Iterator&, size_type, const _Sequence*)): Fix typo. From-SVN: r176500
370 lines
12 KiB
C++
370 lines
12 KiB
C++
// Safe iterator implementation -*- C++ -*-
|
|
|
|
// Copyright (C) 2011 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
|