965 lines
29 KiB
C++
965 lines
29 KiB
C++
// Safe iterator implementation -*- C++ -*-
|
|
|
|
// Copyright (C) 2003-2020 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_iterator.h
|
|
* This file is a GNU debug extension to the Standard C++ Library.
|
|
*/
|
|
|
|
#ifndef _GLIBCXX_DEBUG_SAFE_ITERATOR_H
|
|
#define _GLIBCXX_DEBUG_SAFE_ITERATOR_H 1
|
|
|
|
#include <debug/assertions.h>
|
|
#include <debug/macros.h>
|
|
#include <debug/functions.h>
|
|
#include <debug/safe_base.h>
|
|
#include <bits/stl_pair.h>
|
|
#include <ext/type_traits.h>
|
|
|
|
#define _GLIBCXX_DEBUG_VERIFY_OPERANDS(_Lhs, _Rhs, _BadMsgId, _DiffMsgId) \
|
|
_GLIBCXX_DEBUG_VERIFY(!_Lhs._M_singular() && !_Rhs._M_singular(), \
|
|
_M_message(_BadMsgId) \
|
|
._M_iterator(_Lhs, #_Lhs) \
|
|
._M_iterator(_Rhs, #_Rhs)); \
|
|
_GLIBCXX_DEBUG_VERIFY(_Lhs._M_can_compare(_Rhs), \
|
|
_M_message(_DiffMsgId) \
|
|
._M_iterator(_Lhs, #_Lhs) \
|
|
._M_iterator(_Rhs, #_Rhs))
|
|
|
|
#define _GLIBCXX_DEBUG_VERIFY_EQ_OPERANDS(_Lhs, _Rhs) \
|
|
_GLIBCXX_DEBUG_VERIFY_OPERANDS(_Lhs, _Rhs, __msg_iter_compare_bad, \
|
|
__msg_compare_different)
|
|
|
|
#define _GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(_Lhs, _Rhs) \
|
|
_GLIBCXX_DEBUG_VERIFY_OPERANDS(_Lhs, _Rhs, __msg_iter_order_bad, \
|
|
__msg_order_different)
|
|
|
|
#define _GLIBCXX_DEBUG_VERIFY_DIST_OPERANDS(_Lhs, _Rhs) \
|
|
_GLIBCXX_DEBUG_VERIFY_OPERANDS(_Lhs, _Rhs, __msg_distance_bad, \
|
|
__msg_distance_different)
|
|
|
|
namespace __gnu_debug
|
|
{
|
|
/** Helper struct to deal with sequence offering a before_begin
|
|
* iterator.
|
|
**/
|
|
template<typename _Sequence>
|
|
struct _BeforeBeginHelper
|
|
{
|
|
template<typename _Iterator, typename _Category>
|
|
static bool
|
|
_S_Is(const _Safe_iterator<_Iterator, _Sequence, _Category>&)
|
|
{ return false; }
|
|
|
|
template<typename _Iterator, typename _Category>
|
|
static bool
|
|
_S_Is_Beginnest(const _Safe_iterator<_Iterator, _Sequence, _Category>& __it)
|
|
{ return __it.base() == __it._M_get_sequence()->_M_base().begin(); }
|
|
};
|
|
|
|
/** Sequence traits giving the size of a container if possible. */
|
|
template<typename _Sequence>
|
|
struct _Sequence_traits
|
|
{
|
|
typedef _Distance_traits<typename _Sequence::iterator> _DistTraits;
|
|
|
|
static typename _DistTraits::__type
|
|
_S_size(const _Sequence& __seq)
|
|
{ return std::make_pair(__seq.size(), __dp_exact); }
|
|
};
|
|
|
|
/** \brief Safe iterator wrapper.
|
|
*
|
|
* The class template %_Safe_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_iterator has member functions for iterator invalidation,
|
|
* attaching/detaching the iterator from sequences, and querying
|
|
* the iterator's state.
|
|
*
|
|
* Note that _Iterator must be the first base class so that it gets
|
|
* initialized before the iterator is being attached to the container's list
|
|
* of iterators and it is being detached before _Iterator get
|
|
* destroyed. Otherwise it would result in a data race.
|
|
*/
|
|
template<typename _Iterator, typename _Sequence, typename _Category
|
|
= typename std::iterator_traits<_Iterator>::iterator_category>
|
|
class _Safe_iterator
|
|
: private _Iterator,
|
|
public _Safe_iterator_base
|
|
{
|
|
typedef _Iterator _Iter_base;
|
|
typedef _Safe_iterator_base _Safe_base;
|
|
|
|
typedef std::iterator_traits<_Iterator> _Traits;
|
|
|
|
protected:
|
|
typedef std::__are_same<typename _Sequence::_Base::const_iterator,
|
|
_Iterator> _IsConstant;
|
|
|
|
typedef typename __gnu_cxx::__conditional_type<
|
|
_IsConstant::__value,
|
|
typename _Sequence::_Base::iterator,
|
|
typename _Sequence::_Base::const_iterator>::__type _OtherIterator;
|
|
|
|
struct _Attach_single
|
|
{ };
|
|
|
|
_Safe_iterator(_Iterator __i, _Safe_sequence_base* __seq, _Attach_single)
|
|
_GLIBCXX_NOEXCEPT
|
|
: _Iter_base(__i)
|
|
{ _M_attach_single(__seq); }
|
|
|
|
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;
|
|
|
|
#if __cplusplus > 201703L && __cpp_lib_concepts
|
|
using iterator_concept = std::__detail::__iter_concept<_Iterator>;
|
|
#endif
|
|
|
|
/// @post the iterator is singular and unattached
|
|
_Safe_iterator() _GLIBCXX_NOEXCEPT : _Iter_base() { }
|
|
|
|
/**
|
|
* @brief Safe iterator construction from an unsafe iterator and
|
|
* its sequence.
|
|
*
|
|
* @pre @p seq is not NULL
|
|
* @post this is not singular
|
|
*/
|
|
_Safe_iterator(_Iterator __i, const _Safe_sequence_base* __seq)
|
|
_GLIBCXX_NOEXCEPT
|
|
: _Iter_base(__i), _Safe_base(__seq, _S_constant())
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY(!this->_M_singular(),
|
|
_M_message(__msg_init_singular)
|
|
._M_iterator(*this, "this"));
|
|
}
|
|
|
|
/**
|
|
* @brief Copy construction.
|
|
*/
|
|
_Safe_iterator(const _Safe_iterator& __x) _GLIBCXX_NOEXCEPT
|
|
: _Iter_base(__x.base())
|
|
{
|
|
// _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_copy_singular)
|
|
._M_iterator(*this, "this")
|
|
._M_iterator(__x, "other"));
|
|
_M_attach(__x._M_sequence);
|
|
}
|
|
|
|
#if __cplusplus >= 201103L
|
|
/**
|
|
* @brief Move construction.
|
|
* @post __x is singular and unattached
|
|
*/
|
|
_Safe_iterator(_Safe_iterator&& __x) noexcept
|
|
: _Iter_base()
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY(!__x._M_singular()
|
|
|| __x.base() == _Iterator(),
|
|
_M_message(__msg_init_copy_singular)
|
|
._M_iterator(*this, "this")
|
|
._M_iterator(__x, "other"));
|
|
_Safe_sequence_base* __seq = __x._M_sequence;
|
|
__x._M_detach();
|
|
std::swap(base(), __x.base());
|
|
_M_attach(__seq);
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* @brief Converting constructor from a mutable iterator to a
|
|
* constant iterator.
|
|
*/
|
|
template<typename _MutableIterator>
|
|
_Safe_iterator(
|
|
const _Safe_iterator<_MutableIterator, _Sequence,
|
|
typename __gnu_cxx::__enable_if<_IsConstant::__value &&
|
|
std::__are_same<_MutableIterator, _OtherIterator>::__value,
|
|
_Category>::__type>& __x)
|
|
_GLIBCXX_NOEXCEPT
|
|
: _Iter_base(__x.base())
|
|
{
|
|
// _GLIBCXX_RESOLVE_LIB_DEFECTS
|
|
// DR 408. Is vector<reverse_iterator<char*> > forbidden?
|
|
_GLIBCXX_DEBUG_VERIFY(!__x._M_singular()
|
|
|| __x.base() == _MutableIterator(),
|
|
_M_message(__msg_init_const_singular)
|
|
._M_iterator(*this, "this")
|
|
._M_iterator(__x, "other"));
|
|
_M_attach(__x._M_sequence);
|
|
}
|
|
|
|
/**
|
|
* @brief Copy assignment.
|
|
*/
|
|
_Safe_iterator&
|
|
operator=(const _Safe_iterator& __x) _GLIBCXX_NOEXCEPT
|
|
{
|
|
// _GLIBCXX_RESOLVE_LIB_DEFECTS
|
|
// DR 408. Is vector<reverse_iterator<char*> > forbidden?
|
|
_GLIBCXX_DEBUG_VERIFY(!__x._M_singular()
|
|
|| __x.base() == _Iterator(),
|
|
_M_message(__msg_copy_singular)
|
|
._M_iterator(*this, "this")
|
|
._M_iterator(__x, "other"));
|
|
|
|
if (this->_M_sequence && this->_M_sequence == __x._M_sequence)
|
|
{
|
|
__gnu_cxx::__scoped_lock __l(this->_M_get_mutex());
|
|
base() = __x.base();
|
|
_M_version = __x._M_sequence->_M_version;
|
|
}
|
|
else
|
|
{
|
|
_M_detach();
|
|
base() = __x.base();
|
|
_M_attach(__x._M_sequence);
|
|
}
|
|
|
|
return *this;
|
|
}
|
|
|
|
#if __cplusplus >= 201103L
|
|
/**
|
|
* @brief Move assignment.
|
|
* @post __x is singular and unattached
|
|
*/
|
|
_Safe_iterator&
|
|
operator=(_Safe_iterator&& __x) noexcept
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY(this != &__x,
|
|
_M_message(__msg_self_move_assign)
|
|
._M_iterator(*this, "this"));
|
|
_GLIBCXX_DEBUG_VERIFY(!__x._M_singular()
|
|
|| __x.base() == _Iterator(),
|
|
_M_message(__msg_copy_singular)
|
|
._M_iterator(*this, "this")
|
|
._M_iterator(__x, "other"));
|
|
|
|
if (this->_M_sequence && this->_M_sequence == __x._M_sequence)
|
|
{
|
|
__gnu_cxx::__scoped_lock __l(this->_M_get_mutex());
|
|
base() = __x.base();
|
|
_M_version = __x._M_sequence->_M_version;
|
|
}
|
|
else
|
|
{
|
|
_M_detach();
|
|
base() = __x.base();
|
|
_M_attach(__x._M_sequence);
|
|
}
|
|
|
|
__x._M_detach();
|
|
__x.base() = _Iterator();
|
|
return *this;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* @brief Iterator dereference.
|
|
* @pre iterator is dereferenceable
|
|
*/
|
|
reference
|
|
operator*() const _GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY(this->_M_dereferenceable(),
|
|
_M_message(__msg_bad_deref)
|
|
._M_iterator(*this, "this"));
|
|
return *base();
|
|
}
|
|
|
|
/**
|
|
* @brief Iterator dereference.
|
|
* @pre iterator is dereferenceable
|
|
*/
|
|
pointer
|
|
operator->() const _GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY(this->_M_dereferenceable(),
|
|
_M_message(__msg_bad_deref)
|
|
._M_iterator(*this, "this"));
|
|
return base().operator->();
|
|
}
|
|
|
|
// ------ Input iterator requirements ------
|
|
/**
|
|
* @brief Iterator preincrement
|
|
* @pre iterator is incrementable
|
|
*/
|
|
_Safe_iterator&
|
|
operator++() _GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY(this->_M_incrementable(),
|
|
_M_message(__msg_bad_inc)
|
|
._M_iterator(*this, "this"));
|
|
__gnu_cxx::__scoped_lock __l(this->_M_get_mutex());
|
|
++base();
|
|
return *this;
|
|
}
|
|
|
|
/**
|
|
* @brief Iterator postincrement
|
|
* @pre iterator is incrementable
|
|
*/
|
|
_Safe_iterator
|
|
operator++(int) _GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY(this->_M_incrementable(),
|
|
_M_message(__msg_bad_inc)
|
|
._M_iterator(*this, "this"));
|
|
__gnu_cxx::__scoped_lock __l(this->_M_get_mutex());
|
|
return _Safe_iterator(base()++, this->_M_sequence, _Attach_single());
|
|
}
|
|
|
|
// ------ Utilities ------
|
|
|
|
/// Determine if this is a constant iterator.
|
|
static _GLIBCXX_CONSTEXPR bool
|
|
_S_constant()
|
|
{ return _IsConstant::__value; }
|
|
|
|
/**
|
|
* @brief Return the underlying iterator
|
|
*/
|
|
_Iterator&
|
|
base() _GLIBCXX_NOEXCEPT { return *this; }
|
|
|
|
const _Iterator&
|
|
base() const _GLIBCXX_NOEXCEPT { return *this; }
|
|
|
|
/**
|
|
* @brief Conversion to underlying non-debug iterator to allow
|
|
* better interaction with non-debug containers.
|
|
*/
|
|
operator _Iterator() const _GLIBCXX_NOEXCEPT { return *this; }
|
|
|
|
/** Attach iterator to the given sequence. */
|
|
void
|
|
_M_attach(_Safe_sequence_base* __seq)
|
|
{ _Safe_base::_M_attach(__seq, _S_constant()); }
|
|
|
|
/** Likewise, but not thread-safe. */
|
|
void
|
|
_M_attach_single(_Safe_sequence_base* __seq)
|
|
{ _Safe_base::_M_attach_single(__seq, _S_constant()); }
|
|
|
|
/// Is the iterator dereferenceable?
|
|
bool
|
|
_M_dereferenceable() const
|
|
{ return !this->_M_singular() && !_M_is_end() && !_M_is_before_begin(); }
|
|
|
|
/// Is the iterator before a dereferenceable one?
|
|
bool
|
|
_M_before_dereferenceable() const
|
|
{
|
|
if (this->_M_incrementable())
|
|
{
|
|
_Iterator __base = base();
|
|
return ++__base != _M_get_sequence()->_M_base().end();
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/// Is the iterator incrementable?
|
|
bool
|
|
_M_incrementable() const
|
|
{ return !this->_M_singular() && !_M_is_end(); }
|
|
|
|
// Can we advance the iterator @p __n steps (@p __n may be negative)
|
|
bool
|
|
_M_can_advance(difference_type __n, bool __strict = false) const;
|
|
|
|
// Is the iterator range [*this, __rhs) valid?
|
|
bool
|
|
_M_valid_range(const _Safe_iterator& __rhs,
|
|
std::pair<difference_type, _Distance_precision>& __dist,
|
|
bool __check_dereferenceable = true) const;
|
|
|
|
// The sequence this iterator references.
|
|
typename __gnu_cxx::__conditional_type<
|
|
_IsConstant::__value, const _Sequence*, _Sequence*>::__type
|
|
_M_get_sequence() const
|
|
{ return static_cast<_Sequence*>(_M_sequence); }
|
|
|
|
// Get distance to __rhs.
|
|
typename _Distance_traits<_Iterator>::__type
|
|
_M_get_distance_to(const _Safe_iterator& __rhs) const;
|
|
|
|
// Get distance from sequence begin up to *this.
|
|
typename _Distance_traits<_Iterator>::__type
|
|
_M_get_distance_from_begin() const;
|
|
|
|
// Get distance from *this to sequence end.
|
|
typename _Distance_traits<_Iterator>::__type
|
|
_M_get_distance_to_end() const;
|
|
|
|
/// Is this iterator equal to the sequence's begin() iterator?
|
|
bool
|
|
_M_is_begin() const
|
|
{ return base() == _M_get_sequence()->_M_base().begin(); }
|
|
|
|
/// Is this iterator equal to the sequence's end() iterator?
|
|
bool
|
|
_M_is_end() const
|
|
{ return base() == _M_get_sequence()->_M_base().end(); }
|
|
|
|
/// Is this iterator equal to the sequence's before_begin() iterator if
|
|
/// any?
|
|
bool
|
|
_M_is_before_begin() const
|
|
{ return _BeforeBeginHelper<_Sequence>::_S_Is(*this); }
|
|
|
|
/// Is this iterator equal to the sequence's before_begin() iterator if
|
|
/// any or begin() otherwise?
|
|
bool
|
|
_M_is_beginnest() const
|
|
{ return _BeforeBeginHelper<_Sequence>::_S_Is_Beginnest(*this); }
|
|
|
|
// ------ Operators ------
|
|
|
|
typedef _Safe_iterator<_Iterator, _Sequence, iterator_category> _Self;
|
|
|
|
friend bool
|
|
operator==(const _Self& __lhs, const _Self& __rhs) _GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY_EQ_OPERANDS(__lhs, __rhs);
|
|
return __lhs.base() == __rhs.base();
|
|
}
|
|
|
|
template<typename _IteR>
|
|
friend bool
|
|
operator==(const _Self& __lhs,
|
|
const _Safe_iterator<_IteR, _Sequence, iterator_category>& __rhs)
|
|
_GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY_EQ_OPERANDS(__lhs, __rhs);
|
|
return __lhs.base() == __rhs.base();
|
|
}
|
|
|
|
friend bool
|
|
operator!=(const _Self& __lhs, const _Self& __rhs) _GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY_EQ_OPERANDS(__lhs, __rhs);
|
|
return __lhs.base() != __rhs.base();
|
|
}
|
|
|
|
template<typename _IteR>
|
|
friend bool
|
|
operator!=(const _Self& __lhs,
|
|
const _Safe_iterator<_IteR, _Sequence, iterator_category>& __rhs)
|
|
_GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY_EQ_OPERANDS(__lhs, __rhs);
|
|
return __lhs.base() != __rhs.base();
|
|
}
|
|
};
|
|
|
|
template<typename _Iterator, typename _Sequence>
|
|
class _Safe_iterator<_Iterator, _Sequence, std::bidirectional_iterator_tag>
|
|
: public _Safe_iterator<_Iterator, _Sequence, std::forward_iterator_tag>
|
|
{
|
|
typedef _Safe_iterator<_Iterator, _Sequence,
|
|
std::forward_iterator_tag> _Safe_base;
|
|
|
|
protected:
|
|
typedef typename _Safe_base::_OtherIterator _OtherIterator;
|
|
typedef typename _Safe_base::_Attach_single _Attach_single;
|
|
|
|
_Safe_iterator(_Iterator __i, _Safe_sequence_base* __seq, _Attach_single)
|
|
_GLIBCXX_NOEXCEPT
|
|
: _Safe_base(__i, __seq, _Attach_single())
|
|
{ }
|
|
|
|
public:
|
|
/// @post the iterator is singular and unattached
|
|
_Safe_iterator() _GLIBCXX_NOEXCEPT { }
|
|
|
|
/**
|
|
* @brief Safe iterator construction from an unsafe iterator and
|
|
* its sequence.
|
|
*
|
|
* @pre @p seq is not NULL
|
|
* @post this is not singular
|
|
*/
|
|
_Safe_iterator(_Iterator __i, const _Safe_sequence_base* __seq)
|
|
_GLIBCXX_NOEXCEPT
|
|
: _Safe_base(__i, __seq)
|
|
{ }
|
|
|
|
/**
|
|
* @brief Copy construction.
|
|
*/
|
|
_Safe_iterator(const _Safe_iterator& __x) _GLIBCXX_NOEXCEPT
|
|
: _Safe_base(__x)
|
|
{ }
|
|
|
|
#if __cplusplus >= 201103L
|
|
/** @brief Move construction. */
|
|
_Safe_iterator(_Safe_iterator&&) = default;
|
|
#endif
|
|
|
|
/**
|
|
* @brief Converting constructor from a mutable iterator to a
|
|
* constant iterator.
|
|
*/
|
|
template<typename _MutableIterator>
|
|
_Safe_iterator(
|
|
const _Safe_iterator<_MutableIterator, _Sequence,
|
|
typename __gnu_cxx::__enable_if<_Safe_base::_IsConstant::__value &&
|
|
std::__are_same<_MutableIterator, _OtherIterator>::__value,
|
|
std::bidirectional_iterator_tag>::__type>& __x)
|
|
_GLIBCXX_NOEXCEPT
|
|
: _Safe_base(__x)
|
|
{ }
|
|
|
|
#if __cplusplus >= 201103L
|
|
/** @brief Copy assignment. */
|
|
_Safe_iterator&
|
|
operator=(const _Safe_iterator&) = default;
|
|
|
|
/** @brief Move assignment. */
|
|
_Safe_iterator&
|
|
operator=(_Safe_iterator&&) = default;
|
|
#else
|
|
/** @brief Copy assignment. */
|
|
_Safe_iterator&
|
|
operator=(const _Safe_iterator& __x)
|
|
{
|
|
_Safe_base::operator=(__x);
|
|
return *this;
|
|
}
|
|
#endif
|
|
|
|
// ------ Input iterator requirements ------
|
|
/**
|
|
* @brief Iterator preincrement
|
|
* @pre iterator is incrementable
|
|
*/
|
|
_Safe_iterator&
|
|
operator++() _GLIBCXX_NOEXCEPT
|
|
{
|
|
_Safe_base::operator++();
|
|
return *this;
|
|
}
|
|
|
|
/**
|
|
* @brief Iterator postincrement
|
|
* @pre iterator is incrementable
|
|
*/
|
|
_Safe_iterator
|
|
operator++(int) _GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY(this->_M_incrementable(),
|
|
_M_message(__msg_bad_inc)
|
|
._M_iterator(*this, "this"));
|
|
__gnu_cxx::__scoped_lock __l(this->_M_get_mutex());
|
|
return _Safe_iterator(this->base()++, this->_M_sequence,
|
|
_Attach_single());
|
|
}
|
|
|
|
// ------ Bidirectional iterator requirements ------
|
|
/**
|
|
* @brief Iterator predecrement
|
|
* @pre iterator is decrementable
|
|
*/
|
|
_Safe_iterator&
|
|
operator--() _GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY(this->_M_decrementable(),
|
|
_M_message(__msg_bad_dec)
|
|
._M_iterator(*this, "this"));
|
|
__gnu_cxx::__scoped_lock __l(this->_M_get_mutex());
|
|
--this->base();
|
|
return *this;
|
|
}
|
|
|
|
/**
|
|
* @brief Iterator postdecrement
|
|
* @pre iterator is decrementable
|
|
*/
|
|
_Safe_iterator
|
|
operator--(int) _GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY(this->_M_decrementable(),
|
|
_M_message(__msg_bad_dec)
|
|
._M_iterator(*this, "this"));
|
|
__gnu_cxx::__scoped_lock __l(this->_M_get_mutex());
|
|
return _Safe_iterator(this->base()--, this->_M_sequence,
|
|
_Attach_single());
|
|
}
|
|
|
|
// ------ Utilities ------
|
|
|
|
// Is the iterator decrementable?
|
|
bool
|
|
_M_decrementable() const
|
|
{ return !this->_M_singular() && !this->_M_is_begin(); }
|
|
};
|
|
|
|
template<typename _Iterator, typename _Sequence>
|
|
class _Safe_iterator<_Iterator, _Sequence, std::random_access_iterator_tag>
|
|
: public _Safe_iterator<_Iterator, _Sequence,
|
|
std::bidirectional_iterator_tag>
|
|
{
|
|
typedef _Safe_iterator<_Iterator, _Sequence,
|
|
std::bidirectional_iterator_tag> _Safe_base;
|
|
typedef typename _Safe_base::_OtherIterator _OtherIterator;
|
|
|
|
typedef typename _Safe_base::_Self _Self;
|
|
typedef _Safe_iterator<_OtherIterator, _Sequence,
|
|
std::random_access_iterator_tag> _OtherSelf;
|
|
|
|
typedef typename _Safe_base::_Attach_single _Attach_single;
|
|
|
|
_Safe_iterator(_Iterator __i, _Safe_sequence_base* __seq, _Attach_single)
|
|
_GLIBCXX_NOEXCEPT
|
|
: _Safe_base(__i, __seq, _Attach_single())
|
|
{ }
|
|
|
|
public:
|
|
typedef typename _Safe_base::difference_type difference_type;
|
|
typedef typename _Safe_base::reference reference;
|
|
|
|
/// @post the iterator is singular and unattached
|
|
_Safe_iterator() _GLIBCXX_NOEXCEPT { }
|
|
|
|
/**
|
|
* @brief Safe iterator construction from an unsafe iterator and
|
|
* its sequence.
|
|
*
|
|
* @pre @p seq is not NULL
|
|
* @post this is not singular
|
|
*/
|
|
_Safe_iterator(_Iterator __i, const _Safe_sequence_base* __seq)
|
|
_GLIBCXX_NOEXCEPT
|
|
: _Safe_base(__i, __seq)
|
|
{ }
|
|
|
|
/**
|
|
* @brief Copy construction.
|
|
*/
|
|
_Safe_iterator(const _Safe_iterator& __x) _GLIBCXX_NOEXCEPT
|
|
: _Safe_base(__x)
|
|
{ }
|
|
|
|
#if __cplusplus >= 201103L
|
|
/** @brief Move construction. */
|
|
_Safe_iterator(_Safe_iterator&&) = default;
|
|
#endif
|
|
|
|
/**
|
|
* @brief Converting constructor from a mutable iterator to a
|
|
* constant iterator.
|
|
*/
|
|
template<typename _MutableIterator>
|
|
_Safe_iterator(
|
|
const _Safe_iterator<_MutableIterator, _Sequence,
|
|
typename __gnu_cxx::__enable_if<_Safe_base::_IsConstant::__value &&
|
|
std::__are_same<_MutableIterator, _OtherIterator>::__value,
|
|
std::random_access_iterator_tag>::__type>& __x)
|
|
_GLIBCXX_NOEXCEPT
|
|
: _Safe_base(__x)
|
|
{ }
|
|
|
|
#if __cplusplus >= 201103L
|
|
/** @brief Copy assignment. */
|
|
_Safe_iterator&
|
|
operator=(const _Safe_iterator&) = default;
|
|
|
|
/** @brief Move assignment. */
|
|
_Safe_iterator&
|
|
operator=(_Safe_iterator&&) = default;
|
|
#else
|
|
/** @brief Copy assignment. */
|
|
_Safe_iterator&
|
|
operator=(const _Safe_iterator& __x)
|
|
{
|
|
_Safe_base::operator=(__x);
|
|
return *this;
|
|
}
|
|
#endif
|
|
|
|
// Is the iterator range [*this, __rhs) valid?
|
|
bool
|
|
_M_valid_range(const _Safe_iterator& __rhs,
|
|
std::pair<difference_type,
|
|
_Distance_precision>& __dist) const;
|
|
|
|
// ------ Input iterator requirements ------
|
|
/**
|
|
* @brief Iterator preincrement
|
|
* @pre iterator is incrementable
|
|
*/
|
|
_Safe_iterator&
|
|
operator++() _GLIBCXX_NOEXCEPT
|
|
{
|
|
_Safe_base::operator++();
|
|
return *this;
|
|
}
|
|
|
|
/**
|
|
* @brief Iterator postincrement
|
|
* @pre iterator is incrementable
|
|
*/
|
|
_Safe_iterator
|
|
operator++(int) _GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY(this->_M_incrementable(),
|
|
_M_message(__msg_bad_inc)
|
|
._M_iterator(*this, "this"));
|
|
__gnu_cxx::__scoped_lock __l(this->_M_get_mutex());
|
|
return _Safe_iterator(this->base()++, this->_M_sequence,
|
|
_Attach_single());
|
|
}
|
|
|
|
// ------ Bidirectional iterator requirements ------
|
|
/**
|
|
* @brief Iterator predecrement
|
|
* @pre iterator is decrementable
|
|
*/
|
|
_Safe_iterator&
|
|
operator--() _GLIBCXX_NOEXCEPT
|
|
{
|
|
_Safe_base::operator--();
|
|
return *this;
|
|
}
|
|
|
|
/**
|
|
* @brief Iterator postdecrement
|
|
* @pre iterator is decrementable
|
|
*/
|
|
_Safe_iterator
|
|
operator--(int) _GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY(this->_M_decrementable(),
|
|
_M_message(__msg_bad_dec)
|
|
._M_iterator(*this, "this"));
|
|
__gnu_cxx::__scoped_lock __l(this->_M_get_mutex());
|
|
return _Safe_iterator(this->base()--, this->_M_sequence,
|
|
_Attach_single());
|
|
}
|
|
|
|
// ------ Random access iterator requirements ------
|
|
reference
|
|
operator[](difference_type __n) const _GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY(this->_M_can_advance(__n)
|
|
&& this->_M_can_advance(__n + 1),
|
|
_M_message(__msg_iter_subscript_oob)
|
|
._M_iterator(*this)._M_integer(__n));
|
|
return this->base()[__n];
|
|
}
|
|
|
|
_Safe_iterator&
|
|
operator+=(difference_type __n) _GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY(this->_M_can_advance(__n),
|
|
_M_message(__msg_advance_oob)
|
|
._M_iterator(*this)._M_integer(__n));
|
|
__gnu_cxx::__scoped_lock __l(this->_M_get_mutex());
|
|
this->base() += __n;
|
|
return *this;
|
|
}
|
|
|
|
_Safe_iterator&
|
|
operator-=(difference_type __n) _GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY(this->_M_can_advance(-__n),
|
|
_M_message(__msg_retreat_oob)
|
|
._M_iterator(*this)._M_integer(__n));
|
|
__gnu_cxx::__scoped_lock __l(this->_M_get_mutex());
|
|
this->base() -= __n;
|
|
return *this;
|
|
}
|
|
|
|
friend bool
|
|
operator<(const _Self& __lhs, const _Self& __rhs) _GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(__lhs, __rhs);
|
|
return __lhs.base() < __rhs.base();
|
|
}
|
|
|
|
friend bool
|
|
operator<(const _Self& __lhs, const _OtherSelf& __rhs) _GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(__lhs, __rhs);
|
|
return __lhs.base() < __rhs.base();
|
|
}
|
|
|
|
friend bool
|
|
operator<=(const _Self& __lhs, const _Self& __rhs) _GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(__lhs, __rhs);
|
|
return __lhs.base() <= __rhs.base();
|
|
}
|
|
|
|
friend bool
|
|
operator<=(const _Self& __lhs, const _OtherSelf& __rhs) _GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(__lhs, __rhs);
|
|
return __lhs.base() <= __rhs.base();
|
|
}
|
|
|
|
friend bool
|
|
operator>(const _Self& __lhs, const _Self& __rhs) _GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(__lhs, __rhs);
|
|
return __lhs.base() > __rhs.base();
|
|
}
|
|
|
|
friend bool
|
|
operator>(const _Self& __lhs, const _OtherSelf& __rhs) _GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(__lhs, __rhs);
|
|
return __lhs.base() > __rhs.base();
|
|
}
|
|
|
|
friend bool
|
|
operator>=(const _Self& __lhs, const _Self& __rhs) _GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(__lhs, __rhs);
|
|
return __lhs.base() >= __rhs.base();
|
|
}
|
|
|
|
friend bool
|
|
operator>=(const _Self& __lhs, const _OtherSelf& __rhs) _GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(__lhs, __rhs);
|
|
return __lhs.base() >= __rhs.base();
|
|
}
|
|
|
|
// _GLIBCXX_RESOLVE_LIB_DEFECTS
|
|
// According to the resolution of DR179 not only the various comparison
|
|
// operators but also operator- must accept mixed iterator/const_iterator
|
|
// parameters.
|
|
friend difference_type
|
|
operator-(const _Self& __lhs, const _OtherSelf& __rhs) _GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY_DIST_OPERANDS(__lhs, __rhs);
|
|
return __lhs.base() - __rhs.base();
|
|
}
|
|
|
|
friend difference_type
|
|
operator-(const _Self& __lhs, const _Self& __rhs) _GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY_DIST_OPERANDS(__lhs, __rhs);
|
|
return __lhs.base() - __rhs.base();
|
|
}
|
|
|
|
friend _Self
|
|
operator+(const _Self& __x, difference_type __n) _GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY(__x._M_can_advance(__n),
|
|
_M_message(__msg_advance_oob)
|
|
._M_iterator(__x)._M_integer(__n));
|
|
return _Safe_iterator(__x.base() + __n, __x._M_sequence);
|
|
}
|
|
|
|
friend _Self
|
|
operator+(difference_type __n, const _Self& __x) _GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY(__x._M_can_advance(__n),
|
|
_M_message(__msg_advance_oob)
|
|
._M_iterator(__x)._M_integer(__n));
|
|
return _Safe_iterator(__n + __x.base(), __x._M_sequence);
|
|
}
|
|
|
|
friend _Self
|
|
operator-(const _Self& __x, difference_type __n) _GLIBCXX_NOEXCEPT
|
|
{
|
|
_GLIBCXX_DEBUG_VERIFY(__x._M_can_advance(-__n),
|
|
_M_message(__msg_retreat_oob)
|
|
._M_iterator(__x)._M_integer(__n));
|
|
return _Safe_iterator(__x.base() - __n, __x._M_sequence);
|
|
}
|
|
};
|
|
|
|
/** Safe iterators know how to check if they form a valid range. */
|
|
template<typename _Iterator, typename _Sequence, typename _Category>
|
|
inline bool
|
|
__valid_range(const _Safe_iterator<_Iterator, _Sequence,
|
|
_Category>& __first,
|
|
const _Safe_iterator<_Iterator, _Sequence,
|
|
_Category>& __last,
|
|
typename _Distance_traits<_Iterator>::__type& __dist)
|
|
{ return __first._M_valid_range(__last, __dist); }
|
|
|
|
template<typename _Iterator, typename _Sequence, typename _Category>
|
|
inline bool
|
|
__valid_range(const _Safe_iterator<_Iterator, _Sequence,
|
|
_Category>& __first,
|
|
const _Safe_iterator<_Iterator, _Sequence,
|
|
_Category>& __last)
|
|
{
|
|
typename _Distance_traits<_Iterator>::__type __dist;
|
|
return __first._M_valid_range(__last, __dist);
|
|
}
|
|
|
|
template<typename _Iterator, typename _Sequence, typename _Category,
|
|
typename _Size>
|
|
inline bool
|
|
__can_advance(const _Safe_iterator<_Iterator, _Sequence, _Category>& __it,
|
|
_Size __n)
|
|
{ return __it._M_can_advance(__n); }
|
|
|
|
template<typename _Iterator, typename _Sequence>
|
|
_Iterator
|
|
__base(const _Safe_iterator<_Iterator, _Sequence,
|
|
std::random_access_iterator_tag>& __it)
|
|
{ return __it.base(); }
|
|
|
|
#if __cplusplus < 201103L
|
|
template<typename _Iterator, typename _Sequence>
|
|
struct _Unsafe_type<_Safe_iterator<_Iterator, _Sequence> >
|
|
{ typedef _Iterator _Type; };
|
|
#endif
|
|
|
|
template<typename _Iterator, typename _Sequence>
|
|
inline _Iterator
|
|
__unsafe(const _Safe_iterator<_Iterator, _Sequence>& __it)
|
|
{ return __it.base(); }
|
|
|
|
} // namespace __gnu_debug
|
|
|
|
#undef _GLIBCXX_DEBUG_VERIFY_DIST_OPERANDS
|
|
#undef _GLIBCXX_DEBUG_VERIFY_REL_OPERANDS
|
|
#undef _GLIBCXX_DEBUG_VERIFY_EQ_OPERANDS
|
|
#undef _GLIBCXX_DEBUG_VERIFY_OPERANDS
|
|
|
|
#include <debug/safe_iterator.tcc>
|
|
|
|
#endif
|