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mw_I|+ ? // Internal policy header for unordered_set and unordered_map -*- C++ -*-
// Copyright (C) 2010-2013 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
// .
/** @file bits/hashtable_policy.h
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly.
* @headername{unordered_map,unordered_set}
*/
#ifndef _HASHTABLE_POLICY_H
#define _HASHTABLE_POLICY_H 1
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
template
class _Hashtable;
_GLIBCXX_END_NAMESPACE_VERSION
namespace __detail
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
/**
* @defgroup hashtable-detail Base and Implementation Classes
* @ingroup unordered_associative_containers
* @{
*/
template
struct _Hashtable_base;
// Helper function: return distance(first, last) for forward
// iterators, or 0 for input iterators.
template
inline typename std::iterator_traits<_Iterator>::difference_type
__distance_fw(_Iterator __first, _Iterator __last,
std::input_iterator_tag)
{ return 0; }
template
inline typename std::iterator_traits<_Iterator>::difference_type
__distance_fw(_Iterator __first, _Iterator __last,
std::forward_iterator_tag)
{ return std::distance(__first, __last); }
template
inline typename std::iterator_traits<_Iterator>::difference_type
__distance_fw(_Iterator __first, _Iterator __last)
{
typedef typename std::iterator_traits<_Iterator>::iterator_category _Tag;
return __distance_fw(__first, __last, _Tag());
}
// Helper type used to detect whether the hash functor is noexcept.
template
struct __is_noexcept_hash : std::integral_constant()(declval()))>
{ };
struct _Identity
{
template
_Tp&&
operator()(_Tp&& __x) const
{ return std::forward<_Tp>(__x); }
};
struct _Select1st
{
template
auto
operator()(_Tp&& __x) const
-> decltype(std::get<0>(std::forward<_Tp>(__x)))
{ return std::get<0>(std::forward<_Tp>(__x)); }
};
// Auxiliary types used for all instantiations of _Hashtable nodes
// and iterators.
/**
* struct _Hashtable_traits
*
* Importa