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//usr/include/c++/4.8.2/bits/alloc_traits.h

// Allocator traits -*- C++ -*-

// Copyright (C) 2011-2013 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
// <http://www.gnu.org/licenses/>.

/** @file bits/alloc_traits.h
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{memory}
 */

#ifndef _ALLOC_TRAITS_H
#define _ALLOC_TRAITS_H 1

#if __cplusplus >= 201103L

#include <bits/memoryfwd.h>
#include <bits/ptr_traits.h>
#include <ext/numeric_traits.h>

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

template<typename _Alloc, typename _Tp>
    class __alloctr_rebind_helper
    {
      template<typename _Alloc2, typename _Tp2>
	static constexpr bool
       	_S_chk(typename _Alloc2::template rebind<_Tp2>::other*)
	{ return true; }

template<typename, typename>
        static constexpr bool
       	_S_chk(...)
       	{ return false; }

public:
      static const bool __value = _S_chk<_Alloc, _Tp>(nullptr);
    };

template<typename _Alloc, typename _Tp>
    const bool __alloctr_rebind_helper<_Alloc, _Tp>::__value;

template<typename _Alloc, typename _Tp,
           bool = __alloctr_rebind_helper<_Alloc, _Tp>::__value>
    struct __alloctr_rebind;

template<typename _Alloc, typename _Tp>
    struct __alloctr_rebind<_Alloc, _Tp, true>
    {
      typedef typename _Alloc::template rebind<_Tp>::other __type;
    };

template<template<typename, typename...> class _Alloc, typename _Tp,
            typename _Up, typename... _Args>
    struct __alloctr_rebind<_Alloc<_Up, _Args...>, _Tp, false>
    {
      typedef _Alloc<_Tp, _Args...> __type;
    };

/**
   * @brief  Uniform interface to all allocator types.
   * @ingroup allocators
  */
  template<typename _Alloc>
    struct allocator_traits
    {
      /// The allocator type
      typedef _Alloc allocator_type;
      /// The allocated type
      typedef typename _Alloc::value_type value_type;

#define _GLIBCXX_ALLOC_TR_NESTED_TYPE(_NTYPE, _ALT) \
  private: \
  template<typename _Tp> \
    static typename _Tp::_NTYPE _S_##_NTYPE##_helper(_Tp*); \
  static _ALT _S_##_NTYPE##_helper(...); \
    typedef decltype(_S_##_NTYPE##_helper((_Alloc*)0)) __##_NTYPE; \
  public:

_GLIBCXX_ALLOC_TR_NESTED_TYPE(pointer, value_type*)

/**
       * @brief   The allocator's pointer type.
       *
       * @c Alloc::pointer if that type exists, otherwise @c value_type*
      */
      typedef __pointer pointer;

_GLIBCXX_ALLOC_TR_NESTED_TYPE(const_pointer,
  typename pointer_traits<pointer>::template rebind<const value_type>)

/**
       * @brief   The allocator's const pointer type.
       *
       * @c Alloc::const_pointer if that type exists, otherwise
       * <tt> pointer_traits<pointer>::rebind<const value_type> </tt>
      */
      typedef __const_pointer const_pointer;

_GLIBCXX_ALLOC_TR_NESTED_TYPE(void_pointer,
  typename pointer_traits<pointer>::template rebind<void>)

/**
       * @brief   The allocator's void pointer type.
       *
       * @c Alloc::void_pointer if that type exists, otherwise
       * <tt> pointer_traits<pointer>::rebind<void> </tt>
      */
      typedef __void_pointer void_pointer;

_GLIBCXX_ALLOC_TR_NESTED_TYPE(const_void_pointer,
  typename pointer_traits<pointer>::template rebind<const void>)

/**
       * @brief   The allocator's const void pointer type.
       *
       * @c Alloc::const_void_pointer if that type exists, otherwise
       * <tt> pointer_traits<pointer>::rebind<const void> </tt>
      */
      typedef __const_void_pointer const_void_pointer;

_GLIBCXX_ALLOC_TR_NESTED_TYPE(difference_type,
                              typename pointer_traits<pointer>::difference_type)

/**
       * @brief   The allocator's difference type
       *
       * @c Alloc::difference_type if that type exists, otherwise
       * <tt> pointer_traits<pointer>::difference_type </tt>
      */
      typedef __difference_type difference_type;

_GLIBCXX_ALLOC_TR_NESTED_TYPE(size_type,
                              typename make_unsigned<difference_type>::type)

/**
       * @brief   The allocator's size type
       *
       * @c Alloc::size_type if that type exists, otherwise
       * <tt> make_unsigned<difference_type>::type </tt>
      */
      typedef __size_type size_type;

_GLIBCXX_ALLOC_TR_NESTED_TYPE(propagate_on_container_copy_assignment,
                              false_type)

/**
       * @brief   How the allocator is propagated on copy assignment
       *
       * @c Alloc::propagate_on_container_copy_assignment if that type exists,
       * otherwise @c false_type
      */
      typedef __propagate_on_container_copy_assignment
       	propagate_on_container_copy_assignment;

_GLIBCXX_ALLOC_TR_NESTED_TYPE(propagate_on_container_move_assignment,
                              false_type)

/**
       * @brief   How the allocator is propagated on move assignment
       *
       * @c Alloc::propagate_on_container_move_assignment if that type exists,
       * otherwise @c false_type
      */
      typedef __propagate_on_container_move_assignment
       	propagate_on_container_move_assignment;

_GLIBCXX_ALLOC_TR_NESTED_TYPE(propagate_on_container_swap,
                              false_type)

/**
       * @brief   How the allocator is propagated on swap
       *
       * @c Alloc::propagate_on_container_swap if that type exists,
       * otherwise @c false_type
      */
      typedef __propagate_on_container_swap propagate_on_container_swap;

#undef _GLIBCXX_ALLOC_TR_NESTED_TYPE

template<typename _Tp>
        using rebind_alloc = typename __alloctr_rebind<_Alloc, _Tp>::__type;
      template<typename _Tp>
        using rebind_traits = allocator_traits<rebind_alloc<_Tp>>;

private:
      template<typename _Alloc2>
	struct __allocate_helper
	{
	  template<typename _Alloc3,
	    typename = decltype(std::declval<_Alloc3*>()->allocate(
		  std::declval<size_type>(),
		  std::declval<const_void_pointer>()))>
	    static true_type __test(int);