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// Safe iterator 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_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>
#if __cplusplus > 201703L
# include <compare>
#endif
#define _GLIBCXX_DEBUG_VERIFY_OPERANDS(_Lhs, _Rhs, _BadMsgId, _DiffMsgId) \
_GLIBCXX_DEBUG_VERIFY(!_Lhs._M_singular() && !_Rhs._M_singular() \
|| (_Lhs.base() == _Iterator() \
&& _Rhs.base() == _Iterator()), \
_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()), _Safe_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(!__x._M_singular()
|| __x.base() == _Iterator(),
_M_message(__msg_copy_singular)
._M_iterator(*this, "this")
._M_iterator(__x, "other"));
if (std::__addressof(__x) == this)
return *this;
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
*/
_GLIBCXX_NODISCARD
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
*/
_GLIBCXX_NODISCARD
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;
// Can we advance the iterator using @p __dist in @p __way direction.
template<typename _Diff>
bool
_M_can_advance(const std::pair<_Diff, _Distance_precision>& __dist,
int __way) 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;
_GLIBCXX_NODISCARD
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>
_GLIBCXX_NODISCARD
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();
}
#if ! __cpp_lib_three_way_comparison
_GLIBCXX_NODISCARD
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>
_GLIBCXX_NODISCARD
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();
}
#endif // three-way comparison
};
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 ------
_GLIBCXX_NODISCARD
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;
}
#if __cpp_lib_three_way_comparison
[[nodiscard]]
friend auto
operator<=>(const _Self& __lhs, const _Self& __rhs) noexcept
{
_GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(__lhs, __rhs);
return __lhs.base() <=> __rhs.base();
}
[[nodiscard]]
friend auto
operator<=>(const _Self& __lhs, const _OtherSelf& __rhs) noexcept
{
_GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(__lhs, __rhs);
return __lhs.base() <=> __rhs.base();
}
#else
_GLIBCXX_NODISCARD
friend bool
operator<(const _Self& __lhs, const _Self& __rhs) _GLIBCXX_NOEXCEPT
{
_GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(__lhs, __rhs);
return __lhs.base() < __rhs.base();
}
_GLIBCXX_NODISCARD
friend bool
operator<(const _Self& __lhs, const _OtherSelf& __rhs) _GLIBCXX_NOEXCEPT
{
_GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(__lhs, __rhs);
return __lhs.base() < __rhs.base();
}
_GLIBCXX_NODISCARD
friend bool
operator<=(const _Self& __lhs, const _Self& __rhs) _GLIBCXX_NOEXCEPT
{
_GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(__lhs, __rhs);
return __lhs.base() <= __rhs.base();
}
_GLIBCXX_NODISCARD
friend bool
operator<=(const _Self& __lhs, const _OtherSelf& __rhs) _GLIBCXX_NOEXCEPT
{
_GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(__lhs, __rhs);
return __lhs.base() <= __rhs.base();
}
_GLIBCXX_NODISCARD
friend bool
operator>(const _Self& __lhs, const _Self& __rhs) _GLIBCXX_NOEXCEPT
{
_GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(__lhs, __rhs);
return __lhs.base() > __rhs.base();
}
_GLIBCXX_NODISCARD
friend bool
operator>(const _Self& __lhs, const _OtherSelf& __rhs) _GLIBCXX_NOEXCEPT
{
_GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(__lhs, __rhs);
return __lhs.base() > __rhs.base();
}
_GLIBCXX_NODISCARD
friend bool
operator>=(const _Self& __lhs, const _Self& __rhs) _GLIBCXX_NOEXCEPT
{
_GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(__lhs, __rhs);
return __lhs.base() >= __rhs.base();
}
_GLIBCXX_NODISCARD
friend bool
operator>=(const _Self& __lhs, const _OtherSelf& __rhs) _GLIBCXX_NOEXCEPT
{
_GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(__lhs, __rhs);
return __lhs.base() >= __rhs.base();
}
#endif // three-way comparison
// _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.
_GLIBCXX_NODISCARD
friend difference_type
operator-(const _Self& __lhs, const _OtherSelf& __rhs) _GLIBCXX_NOEXCEPT
{
_GLIBCXX_DEBUG_VERIFY_DIST_OPERANDS(__lhs, __rhs);
return __lhs.base() - __rhs.base();
}
_GLIBCXX_NODISCARD
friend difference_type
operator-(const _Self& __lhs, const _Self& __rhs) _GLIBCXX_NOEXCEPT
{
_GLIBCXX_DEBUG_VERIFY_DIST_OPERANDS(__lhs, __rhs);
return __lhs.base() - __rhs.base();
}
_GLIBCXX_NODISCARD
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);
}
_GLIBCXX_NODISCARD
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);
}
_GLIBCXX_NODISCARD
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, typename _Category,
typename _Diff>
inline bool
__can_advance(const _Safe_iterator<_Iterator, _Sequence, _Category>& __it,
const std::pair<_Diff, _Distance_precision>& __dist,
int __way)
{ return __it._M_can_advance(__dist, __way); }
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
#if __cplusplus >= 201103L && __cplusplus <= 201703L
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
template<typename _Iterator, typename _Container, typename _Sequence>
constexpr auto
__to_address(const __gnu_debug::_Safe_iterator<
__gnu_cxx::__normal_iterator<_Iterator, _Container>,
_Sequence>& __it) noexcept
-> decltype(std::__to_address(__it.base().base()))
{ return std::__to_address(__it.base().base()); }
_GLIBCXX_END_NAMESPACE_VERSION
}
#endif
#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
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