// <forward_list> -*- C++ -*-
// Copyright (C) 2010-2017 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/forward_list
* This file is a GNU debug extension to the Standard C++ Library.
*/
#ifndef _GLIBCXX_DEBUG_FORWARD_LIST
#define _GLIBCXX_DEBUG_FORWARD_LIST 1
#pragma GCC system_header
#include <forward_list>
#include <debug/safe_sequence.h>
#include <debug/safe_container.h>
#include <debug/safe_iterator.h>
// Special validity check for forward_list ranges.
#define __glibcxx_check_valid_fl_range(_First,_Last,_Dist) \
_GLIBCXX_DEBUG_VERIFY(_First._M_valid_range(_Last, _Dist, false), \
_M_message(__gnu_debug::__msg_valid_range) \
._M_iterator(_First, #_First) \
._M_iterator(_Last, #_Last))
namespace __gnu_debug
{
/// Special iterators swap and invalidation for forward_list because of the
/// before_begin iterator.
template<typename _SafeSequence>
class _Safe_forward_list
: public _Safe_sequence<_SafeSequence>
{
_SafeSequence&
_M_this() noexcept
{ return *static_cast<_SafeSequence*>(this); }
static void
_M_swap_aux(_Safe_sequence_base& __lhs,
_Safe_iterator_base*& __lhs_iterators,
_Safe_sequence_base& __rhs,
_Safe_iterator_base*& __rhs_iterators);
void _M_swap_single(_Safe_sequence_base&) noexcept;
protected:
void
_M_invalidate_all()
{
using _Base_const_iterator = __decltype(_M_this()._M_base().cend());
this->_M_invalidate_if([this](_Base_const_iterator __it)
{
return __it != _M_this()._M_base().cbefore_begin()
&& __it != _M_this()._M_base().cend(); });
}
void _M_swap(_Safe_sequence_base&) noexcept;
};
template<typename _SafeSequence>
void
_Safe_forward_list<_SafeSequence>::
_M_swap_aux(_Safe_sequence_base& __lhs,
_Safe_iterator_base*& __lhs_iterators,
_Safe_sequence_base& __rhs,
_Safe_iterator_base*& __rhs_iterators)
{
using const_iterator = typename _SafeSequence::const_iterator;
_Safe_iterator_base* __bbegin_its = 0;
_Safe_iterator_base* __last_bbegin = 0;
_SafeSequence& __rseq = static_cast<_SafeSequence&>(__rhs);
for (_Safe_iterator_base* __iter = __lhs_iterators; __iter;)
{
// Even iterator is cast to const_iterator, not a problem.
_Safe_iterator_base* __victim_base = __iter;
const_iterator* __victim =
static_cast<const_iterator*>(__victim_base);
__iter = __iter->_M_next;
if (__victim->base() == __rseq._M_base().cbefore_begin())
{
__victim->_M_unlink();
if (__lhs_iterators == __victim_base)
__lhs_iterators = __victim_base->_M_next;
if (__bbegin_its)
{
__victim_base->_M_next = __bbegin_its;
__bbegin_its->_M_prior = __victim_base;
}
else
__last_bbegin = __victim_base;
__bbegin_its = __victim_base;
}
else
__victim_base->_M_sequence = std::__addressof(__lhs);
}
if (__bbegin_its)
{
if (__rhs_iterators)
{
__rhs_iterators->_M_prior = __last_bbegin;
__last_bbegin->_M_next = __rhs_iterators;
}
__rhs_iterators = __bbegin_its;
}
}
template<typename _SafeSequence>
void
_Safe_forward_list<_SafeSequence>::
_M_swap_single(_Safe_sequence_base& __other) noexcept
{
std::swap(_M_this()._M_iterators, __other._M_iterators);
std::swap(_M_this()._M_const_iterators, __other._M_const_iterators);
// Useless, always 1 on forward_list
//std::swap(_M_this()_M_version, __other._M_version);
_Safe_iterator_base* __this_its = _M_this()._M_iterators;
_M_swap_aux(__other, __other._M_iterators,
_M_this(), _M_this()._M_iterators);
_Safe_iterator_base* __this_const_its = _M_this()._M_const_iterators;
_M_swap_aux(__other, __other._M_const_iterators,
_M_this(), _M_this()._M_const_iterators);
_M_swap_aux(_M_this(), __this_its,
__other, __other._M_iterators);
_M_swap_aux(_M_this(), __this_const_its,
__other, __other._M_const_iterators);
}
/* Special forward_list _M_swap version that does not swap the
* before-begin ownership.*/
template<typename _SafeSequence>
void
_Safe_forward_list<_SafeSequence>::
_M_swap(_Safe_sequence_base& __other) noexcept
{
// We need to lock both sequences to swap
using namespace __gnu_cxx;
__mutex *__this_mutex = &_M_this()._M_get_mutex();
__mutex *__other_mutex =
&static_cast<_SafeSequence&>(__other)._M_get_mutex();
if (__this_mutex == __other_mutex)
{
__scoped_lock __lock(*__this_mutex);
_M_swap_single(__other);
}
else
{
__scoped_lock __l1(__this_mutex < __other_mutex
? *__this_mutex : *__other_mutex);
__scoped_lock __l2(__this_mutex < __other_mutex
? *__other_mutex : *__this_mutex);
_M_swap_single(__other);
}
}
}
namespace std _GLIBCXX_VISIBILITY(default)
{
namespace __debug
{
/// Class std::forward_list with safety/checking/debug instrumentation.
template<typename _Tp, typename _Alloc = std::allocator<_Tp> >
class forward_list
: public __gnu_debug::_Safe_container<
forward_list<_Tp, _Alloc>, _Alloc, __gnu_debug::_Safe_forward_list>,
public _GLIBCXX_STD_C::forward_list<_Tp, _Alloc>
{
typedef _GLIBCXX_STD_C::forward_list<_Tp, _Alloc> _Base;
typedef __gnu_debug::_Safe_container<
forward_list, _Alloc, __gnu_debug::_Safe_forward_list> _Safe;
typedef typename _Base::iterator _Base_iterator;
typedef typename _Base::const_iterator _Base_const_iterator;
public:
typedef typename _Base::reference reference;
typedef typename _Base::const_reference const_reference;
typedef __gnu_debug::_Safe_iterator<
_Base_iterator, forward_list> iterator;
typedef __gnu_debug::_Safe_iterator<
_Base_const_iterator, forward_list> const_iterator;
typedef typename _Base::size_type size_type;
typedef typename _Base::difference_type difference_type;
typedef _Tp value_type;
typedef typename _Base::allocator_type allocator_type;
typedef typename _Base::pointer pointer;
typedef typename _Base::const_pointer const_pointer;
// 23.2.3.1 construct/copy/destroy:
forward_list() = default;
explicit
forward_list(const allocator_type& __al) noexcept
: _Base(__al) { }
forward_list(const forward_list& __list, const allocator_type& __al)
: _Base(__list, __al)
{ }
forward_list(forward_list&& __list, const allocator_type& __al)
: _Safe(std::move(__list._M_safe()), __al),
_Base(std::move(__list._M_base()), __al)
{ }
explicit
forward_list(size_type __n, const allocator_type& __al = allocator_type())
: _Base(__n, __al)
{ }
forward_list(size_type __n, const _Tp& __value,
const allocator_type& __al = allocator_type())
: _Base(__n, __value, __al)
{ }
template<typename _InputIterator,
typename = std::_RequireInputIter<_InputIterator>>
forward_list(_InputIterator __first, _InputIterator __last,
const allocator_type& __al = allocator_type())
: _Base(__gnu_debug::__base(__gnu_debug::__check_valid_range(__first,
__last)),
__gnu_debug::__base(__last), __al)
{ }
forward_list(const forward_list&) = default;
forward_list(forward_list&&) = default;
forward_list(std::initializer_list<_Tp> __il,
const allocator_type& __al = allocator_type())
: _Base(__il, __al)
{ }
~forward_list() = default;
forward_list&
operator=(const forward_list&) = default;
forward_list&
operator=(forward_list&&) = default;
forward_list&
operator=(std::initializer_list<_Tp> __il)
{
_M_base() = __il;
this->_M_invalidate_all();
return *this;
}
template<typename _InputIterator,
typename = std::_RequireInputIter<_InputIterator>>
void
assign(_InputIterator __first, _InputIterator __last)
{
typename __gnu_debug::_Distance_traits<_InputIterator>::__type __dist;
__glibcxx_check_valid_range2(__first, __last, __dist);
if (__dist.second >= __gnu_debug::__dp_sign)
_Base::assign(__gnu_debug::__unsafe(__first),
__gnu_debug::__unsafe(__last));
else
_Base::assign(__first, __last);
this->_M_invalidate_all();
}
void
assign(size_type __n, const _Tp& __val)
{
_Base::assign(__n, __val);
this->_M_invalidate_all();
}
void
assign(std::initializer_list<_Tp> __il)
{
_Base::assign(__il);
this->_M_invalidate_all();
}
using _Base::get_allocator;
// iterators:
iterator
before_begin() noexcept
{ return iterator(_Base::before_begin(), this); }
const_iterator
before_begin() const noexcept
{ return const_iterator(_Base::before_begin(), this); }
iterator
begin() noexcept
{ return iterator(_Base::begin(), this); }
const_iterator
begin() const noexcept
{ return const_iterator(_Base::begin(), this); }
iterator
end() noexcept
{ return iterator(_Base::end(), this); }
const_iterator
end() const noexcept
{ return const_iterator(_Base::end(), this); }
const_iterator
cbegin() const noexcept
{ return const_iterator(_Base::cbegin(), this); }
const_iterator
cbefore_begin() const noexcept
{ return const_iterator(_Base::cbefore_begin(), this); }
const_iterator
cend() const noexcept
{ return const_iterator(_Base::cend(), this); }
using _Base::empty;
using _Base::max_size;
// element access:
reference
front()
{
__glibcxx_check_nonempty();
return _Base::front();
}
const_reference
front() const
{
__glibcxx_check_nonempty();
return _Base::front();
}
// modifiers:
using _Base::emplace_front;
using _Base::push_front;
void
pop_front()
{
__glibcxx_check_nonempty();
this->_M_invalidate_if([this](_Base_const_iterator __it)
{ return __it == this->_M_base().cbegin(); });
_Base::pop_front();
}
template<typename... _Args>
iterator
emplace_after(const_iterator __pos, _Args&&... __args)
{
__glibcxx_check_insert_after(__pos);
return iterator(_Base::emplace_after(__pos.base(),
std::forward<_Args>(__args)...),
this);
}
iterator
insert_after(const_iterator __pos, const _Tp& __val)
{
__glibcxx_check_insert_after(__pos);
return iterator(_Base::insert_after(__pos.base(), __val), this);
}
iterator
insert_after(const_iterator __pos, _Tp&& __val)
{
__glibcxx_check_insert_after(__pos);
return iterator(_Base::insert_after(__pos.base(), std::move(__val)),
this);
}
iterator
insert_after(const_iterator __pos, size_type __n, const _Tp& __val)
{
__glibcxx_check_insert_after(__pos);
return iterator(_Base::insert_after(__pos.base(), __n, __val),
this);
}
template<typename _InputIterator,
typename = std::_RequireInputIter<_InputIterator>>
iterator
insert_after(const_iterator __pos,
_InputIterator __first, _InputIterator __last)
{
typename __gnu_debug::_Distance_traits<_InputIterator>::__type __dist;
__glibcxx_check_insert_range_after(__pos, __first, __last, __dist);
if (__dist.second >= __gnu_debug::__dp_sign)
return
{
_Base::insert_after(__pos.base(),
__gnu_debug::__unsafe(__first),
__gnu_debug::__unsafe(__last)),
this
};
else
return { _Base::insert_after(__pos.base(), __first, __last), this };
}
iterator
insert_after(const_iterator __pos, std::initializer_list<_Tp> __il)
{
__glibcxx_check_insert_after(__pos);
return iterator(_Base::insert_after(__pos.base(), __il), this);
}
private:
_Base_iterator
_M_erase_after(_Base_const_iterator __pos)
{
_Base_const_iterator __next = std::next(__pos);
this->_M_invalidate_if([__next](_Base_const_iterator __it)
{ return __it == __next; });
return _Base::erase_after(__pos);
}
public:
iterator
erase_after(const_iterator __pos)
{
__glibcxx_check_erase_after(__pos);
return iterator(_M_erase_after(__pos.base()), this);
}
iterator
erase_after(const_iterator __pos, const_iterator __last)
{
__glibcxx_check_erase_range_after(__pos, __last);
for (_Base_const_iterator __victim = std::next(__pos.base());
__victim != __last.base(); ++__victim)
{
_GLIBCXX_DEBUG_VERIFY(__victim != _Base::end(),
_M_message(__gnu_debug::__msg_valid_range2)
._M_sequence(*this, "this")
._M_iterator(__pos, "pos")
._M_iterator(__last, "last"));
this->_M_invalidate_if([__victim](_Base_const_iterator __it)
{ return __it == __victim; });
}
return iterator(_Base::erase_after(__pos.base(), __last.base()), this);
}
void
swap(forward_list& __list)
noexcept( noexcept(declval<_Base&>().swap(__list)) )
{
_Safe::_M_swap(__list);
_Base::swap(__list);
}
void
resize(size_type __sz)
{
this->_M_detach_singular();
// if __sz < size(), invalidate all iterators in [begin+__sz, end()
_Base_iterator __victim = _Base::begin();
_Base_iterator __end = _Base::end();
for (size_type __i = __sz; __victim != __end && __i > 0; --__i)
++__victim;
for (; __victim != __end; ++__victim)
{
this->_M_invalidate_if([__victim](_Base_const_iterator __it)
{ return __it == __victim; });
}
__try
{
_Base::resize(__sz);
}
__catch(...)
{
this->_M_revalidate_singular();
__throw_exception_again;
}
}
void
resize(size_type __sz, const value_type& __val)
{
this->_M_detach_singular();
// if __sz < size(), invalidate all iterators in [begin+__sz, end())
_Base_iterator __victim = _Base::begin();
_Base_iterator __end = _Base::end();
for (size_type __i = __sz; __victim != __end && __i > 0; --__i)
++__victim;
for (; __victim != __end; ++__victim)
{
this->_M_invalidate_if([__victim](_Base_const_iterator __it)
{ return __it == __victim; });
}
__try
{
_Base::resize(__sz, __val);
}
__catch(...)
{
this->_M_revalidate_singular();
__throw_exception_again;
}
}
void
clear() noexcept
{
_Base::clear();
this->_M_invalidate_all();
}
// 23.2.3.5 forward_list operations:
void
splice_after(const_iterator __pos, forward_list&& __list)
{
__glibcxx_check_insert_after(__pos);
_GLIBCXX_DEBUG_VERIFY(std::__addressof(__list) != this,
_M_message(__gnu_debug::__msg_self_splice)
._M_sequence(*this, "this"));
_GLIBCXX_DEBUG_VERIFY(__list.get_allocator() == this->get_allocator(),
_M_message(__gnu_debug::__msg_splice_alloc)
._M_sequence(*this)
._M_sequence(__list, "__list"));
this->_M_transfer_from_if(__list, [&__list](_Base_const_iterator __it)
{
return __it != __list._M_base().cbefore_begin()
&& __it != __list._M_base().end();
});
_Base::splice_after(__pos.base(), std::move(__list._M_base()));
}
void
splice_after(const_iterator __pos, forward_list& __list)
{ splice_after(__pos, std::move(__list)); }
void
splice_after(const_iterator __pos, forward_list&& __list,
const_iterator __i)
{
__glibcxx_check_insert_after(__pos);
_GLIBCXX_DEBUG_VERIFY(__i._M_before_dereferenceable(),
_M_message(__gnu_debug::__msg_splice_bad)
._M_iterator(__i, "__i"));
_GLIBCXX_DEBUG_VERIFY(__i._M_attached_to(std::__addressof(__list)),
_M_message(__gnu_debug::__msg_splice_other)
._M_iterator(__i, "__i")
._M_sequence(__list, "__list"));
_GLIBCXX_DEBUG_VERIFY(__list.get_allocator() == this->get_allocator(),
_M_message(__gnu_debug::__msg_splice_alloc)
._M_sequence(*this)
._M_sequence(__list, "__list"));
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 250. splicing invalidates iterators
_Base_const_iterator __next = std::next(__i.base());
this->_M_transfer_from_if(__list, [__next](_Base_const_iterator __it)
{ return __it == __next; });
_Base::splice_after(__pos.base(), std::move(__list._M_base()),
__i.base());
}
void
splice_after(const_iterator __pos, forward_list& __list,
const_iterator __i)
{ splice_after(__pos, std::move(__list), __i); }
void
splice_after(const_iterator __pos, forward_list&& __list,
const_iterator __before, const_iterator __last)
{
typename __gnu_debug::_Distance_traits<const_iterator>::__type __dist;
auto __listptr = std::__addressof(__list);
__glibcxx_check_insert_after(__pos);
__glibcxx_check_valid_fl_range(__before, __last, __dist);
_GLIBCXX_DEBUG_VERIFY(__before._M_attached_to(__listptr),
_M_message(__gnu_debug::__msg_splice_other)
._M_sequence(__list, "list")
._M_iterator(__before, "before"));
_GLIBCXX_DEBUG_VERIFY(__before._M_dereferenceable()
|| __before._M_is_before_begin(),
_M_message(__gnu_debug::__msg_valid_range2)
._M_sequence(__list, "list")
._M_iterator(__before, "before")
._M_iterator(__last, "last"));
_GLIBCXX_DEBUG_VERIFY(__before != __last,
_M_message(__gnu_debug::__msg_valid_range2)
._M_sequence(__list, "list")
._M_iterator(__before, "before")
._M_iterator(__last, "last"));
_GLIBCXX_DEBUG_VERIFY(__list.get_allocator() == this->get_allocator(),
_M_message(__gnu_debug::__msg_splice_alloc)
._M_sequence(*this)
._M_sequence(__list, "__list"));
for (_Base_const_iterator __tmp = std::next(__before.base());
__tmp != __last.base(); ++__tmp)
{
_GLIBCXX_DEBUG_VERIFY(__tmp != __list._M_base().end(),
_M_message(__gnu_debug::__msg_valid_range2)
._M_sequence(__list, "list")
._M_iterator(__before, "before")
._M_iterator(__last, "last"));
_GLIBCXX_DEBUG_VERIFY(__listptr != this || __tmp != __pos.base(),
_M_message(__gnu_debug::__msg_splice_overlap)
._M_iterator(__tmp, "position")
._M_iterator(__before, "before")
._M_iterator(__last, "last"));
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 250. splicing invalidates iterators
this->_M_transfer_from_if(__list, [__tmp](_Base_const_iterator __it)
{ return __it == __tmp; });
}
_Base::splice_after(__pos.base(), std::move(__list._M_base()),
__before.base(), __last.base());
}
void
splice_after(const_iterator __pos, forward_list& __list,
const_iterator __before, const_iterator __last)
{ splice_after(__pos, std::move(__list), __before, __last); }
void
remove(const _Tp& __val)
{
_Base_iterator __x = _Base::before_begin();
_Base_iterator __old = __x++;
while (__x != _Base::end())
{
if (*__x == __val)
__x = _M_erase_after(__old);
else
__old = __x++;
}
}
template<typename _Pred>
void
remove_if(_Pred __pred)
{
_Base_iterator __x = _Base::before_begin();
_Base_iterator __old = __x++;
while (__x != _Base::end())
{
if (__pred(*__x))
__x = _M_erase_after(__old);
else
__old = __x++;
}
}
void
unique()
{
_Base_iterator __first = _Base::begin();
_Base_iterator __last = _Base::end();
if (__first == __last)
return;
_Base_iterator __next = std::next(__first);
while (__next != __last)
{
if (*__first == *__next)
__next = _M_erase_after(__first);
else
__first = __next++;
}
}
template<typename _BinPred>
void
unique(_BinPred __binary_pred)
{
_Base_iterator __first = _Base::begin();
_Base_iterator __last = _Base::end();
if (__first == __last)
return;
_Base_iterator __next = std::next(__first);
while (__next != __last)
{
if (__binary_pred(*__first, *__next))
__next = _M_erase_after(__first);
else
__first = __next++;
}
}
void
merge(forward_list&& __list)
{
if (this != std::__addressof(__list))
{
__glibcxx_check_sorted(_Base::begin(), _Base::end());
__glibcxx_check_sorted(__list._M_base().begin(),
__list._M_base().end());
this->_M_transfer_from_if(__list, [&__list](_Base_const_iterator __it)
{
return __it != __list._M_base().cbefore_begin()
&& __it != __list._M_base().cend();
});
_Base::merge(std::move(__list._M_base()));
}
}
void
merge(forward_list& __list)
{ merge(std::move(__list)); }
template<typename _Comp>
void
merge(forward_list&& __list, _Comp __comp)
{
if (this != std::__addressof(__list))
{
__glibcxx_check_sorted_pred(_Base::begin(), _Base::end(), __comp);
__glibcxx_check_sorted_pred(__list._M_base().begin(),
__list._M_base().end(), __comp);
this->_M_transfer_from_if(__list,
[&__list](_Base_const_iterator __it)
{
return __it != __list._M_base().cbefore_begin()
&& __it != __list._M_base().cend();
});
_Base::merge(std::move(__list._M_base()), __comp);
}
}
template<typename _Comp>
void
merge(forward_list& __list, _Comp __comp)
{ merge(std::move(__list), __comp); }
using _Base::sort;
using _Base::reverse;
_Base&
_M_base() noexcept { return *this; }
const _Base&
_M_base() const noexcept { return *this; }
};
template<typename _Tp, typename _Alloc>
bool
operator==(const forward_list<_Tp, _Alloc>& __lx,
const forward_list<_Tp, _Alloc>& __ly)
{ return __lx._M_base() == __ly._M_base(); }
template<typename _Tp, typename _Alloc>
inline bool
operator<(const forward_list<_Tp, _Alloc>& __lx,
const forward_list<_Tp, _Alloc>& __ly)
{ return __lx._M_base() < __ly._M_base(); }
template<typename _Tp, typename _Alloc>
inline bool
operator!=(const forward_list<_Tp, _Alloc>& __lx,
const forward_list<_Tp, _Alloc>& __ly)
{ return !(__lx == __ly); }
/// Based on operator<
template<typename _Tp, typename _Alloc>
inline bool
operator>(const forward_list<_Tp, _Alloc>& __lx,
const forward_list<_Tp, _Alloc>& __ly)
{ return (__ly < __lx); }
/// Based on operator<
template<typename _Tp, typename _Alloc>
inline bool
operator>=(const forward_list<_Tp, _Alloc>& __lx,
const forward_list<_Tp, _Alloc>& __ly)
{ return !(__lx < __ly); }
/// Based on operator<
template<typename _Tp, typename _Alloc>
inline bool
operator<=(const forward_list<_Tp, _Alloc>& __lx,
const forward_list<_Tp, _Alloc>& __ly)
{ return !(__ly < __lx); }
/// See std::forward_list::swap().
template<typename _Tp, typename _Alloc>
inline void
swap(forward_list<_Tp, _Alloc>& __lx, forward_list<_Tp, _Alloc>& __ly)
noexcept(noexcept(__lx.swap(__ly)))
{ __lx.swap(__ly); }
} // namespace __debug
} // namespace std
namespace __gnu_debug
{
template<typename _Tp, typename _Alloc>
struct _BeforeBeginHelper<std::__debug::forward_list<_Tp, _Alloc> >
{
typedef std::__debug::forward_list<_Tp, _Alloc> _Sequence;
template<typename _Iterator>
static bool
_S_Is(const _Safe_iterator<_Iterator, _Sequence>& __it)
{
return
__it.base() == __it._M_get_sequence()->_M_base().before_begin();
}
template<typename _Iterator>
static bool
_S_Is_Beginnest(const _Safe_iterator<_Iterator, _Sequence>& __it)
{ return _S_Is(__it); }
};
template<typename _Tp, typename _Alloc>
struct _Sequence_traits<std::__debug::forward_list<_Tp, _Alloc> >
{
typedef typename std::__debug::forward_list<_Tp, _Alloc>::iterator _It;
static typename _Distance_traits<_It>::__type
_S_size(const std::__debug::forward_list<_Tp, _Alloc>& __seq)
{
return __seq.empty()
? std::make_pair(0, __dp_exact) : std::make_pair(1, __dp_equality);
}
};
#ifndef _GLIBCXX_DEBUG_PEDANTIC
template<class _Tp, class _Alloc>
struct _Insert_range_from_self_is_safe<
std::__debug::forward_list<_Tp, _Alloc> >
{ enum { __value = 1 }; };
#endif
}
#endif