libstdc++-v3/include/bits/alloc_traits.h - native_client/nacl-gcc - Git at Google

 // 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);

 	  template<typename>
 	    static false_type __test(...);

 	  typedef decltype(__test<_Alloc>(0)) type;
 	  static const bool value = type::value;
 	};

       template<typename _Alloc2>
 	static typename
        	enable_if<__allocate_helper<_Alloc2>::value, pointer>::type
        	_S_allocate(_Alloc2& __a, size_type __n, const_void_pointer __hint)
 	{ return __a.allocate(__n, __hint); }

       template<typename _Alloc2>
 	static typename
        	enable_if<!__allocate_helper<_Alloc2>::value, pointer>::type
        	_S_allocate(_Alloc2& __a, size_type __n, ...)
 	{ return __a.allocate(__n); }

       template<typename _Tp, typename... _Args>
 	struct __construct_helper
 	{
 	  template<typename _Alloc2,
 	    typename = decltype(std::declval<_Alloc2*>()->construct(
 		  std::declval<_Tp*>(), std::declval<_Args>()...))>
 	    static true_type __test(int);

 	  template<typename>
 	    static false_type __test(...);

 	  typedef decltype(__test<_Alloc>(0)) type;
 	  static const bool value = type::value;
 	};

       template<typename _Tp, typename... _Args>
 	static typename
        	enable_if<__construct_helper<_Tp, _Args...>::value, void>::type
        	_S_construct(_Alloc& __a, _Tp* __p, _Args&&... __args)
 	{ __a.construct(__p, std::forward<_Args>(__args)...); }

       template<typename _Tp, typename... _Args>
 	static typename
 	enable_if<__and_<__not_<__construct_helper<_Tp, _Args...>>,
 			 is_constructible<_Tp, _Args...>>::value, void>::type
        	_S_construct(_Alloc&, _Tp* __p, _Args&&... __args)
 	{ ::new((void*)__p) _Tp(std::forward<_Args>(__args)...); }

       template<typename _Tp>
 	struct __destroy_helper
 	{
 	  template<typename _Alloc2,
 	    typename = decltype(std::declval<_Alloc2*>()->destroy(
 		  std::declval<_Tp*>()))>
 	    static true_type __test(int);

 	  template<typename>
 	    static false_type __test(...);

 	  typedef decltype(__test<_Alloc>(0)) type;
 	  static const bool value = type::value;
 	};

       template<typename _Tp>
 	static typename enable_if<__destroy_helper<_Tp>::value, void>::type
        	_S_destroy(_Alloc& __a, _Tp* __p)
 	{ __a.destroy(__p); }

       template<typename _Tp>
 	static typename enable_if<!__destroy_helper<_Tp>::value, void>::type
        	_S_destroy(_Alloc&, _Tp* __p)
 	{ __p->~_Tp(); }

       template<typename _Alloc2>
 	struct __maxsize_helper
 	{
 	  template<typename _Alloc3,
 	    typename = decltype(std::declval<_Alloc3*>()->max_size())>
 	    static true_type __test(int);

 	  template<typename>
 	    static false_type __test(...);

 	  typedef decltype(__test<_Alloc2>(0)) type;
 	  static const bool value = type::value;
 	};

       template<typename _Alloc2>
 	static typename
        	enable_if<__maxsize_helper<_Alloc2>::value, size_type>::type
        	_S_max_size(_Alloc2& __a)
 	{ return __a.max_size(); }

       template<typename _Alloc2>
 	static typename
        	enable_if<!__maxsize_helper<_Alloc2>::value, size_type>::type
 	_S_max_size(_Alloc2&)
 	{ return __gnu_cxx::__numeric_traits<size_type>::__max; }

       template<typename _Alloc2>
 	struct __select_helper
 	{
 	  template<typename _Alloc3, typename
 	    = decltype(std::declval<_Alloc3*>()
 		->select_on_container_copy_construction())>
 	    static true_type __test(int);

 	  template<typename>
 	    static false_type __test(...);

 	  typedef decltype(__test<_Alloc2>(0)) type;
 	  static const bool value = type::value;
 	};
       template<typename _Alloc2>
 	static typename
        	enable_if<__select_helper<_Alloc2>::value, _Alloc2>::type
        	_S_select(_Alloc2& __a)
 	{ return __a.select_on_container_copy_construction(); }

       template<typename _Alloc2>
 	static typename
        	enable_if<!__select_helper<_Alloc2>::value, _Alloc2>::type
        	_S_select(_Alloc2& __a)
 	{ return __a; }

     public:

       /**
        *  @brief  Allocate memory.
        *  @param  __a  An allocator.
        *  @param  __n  The number of objects to allocate space for.
        *
        *  Calls @c a.allocate(n)
       */
       static pointer
       allocate(_Alloc& __a, size_type __n)
       { return __a.allocate(__n); }

       /**
        *  @brief  Allocate memory.
        *  @param  __a  An allocator.
        *  @param  __n  The number of objects to allocate space for.
        *  @param  __hint Aid to locality.
        *  @return Memory of suitable size and alignment for @a n objects
        *          of type @c value_type
        *
        *  Returns <tt> a.allocate(n, hint) </tt> if that expression is
        *  well-formed, otherwise returns @c a.allocate(n)
       */
       static pointer
       allocate(_Alloc& __a, size_type __n, const_void_pointer __hint)
       { return _S_allocate(__a, __n, __hint); }

       /**
        *  @brief  Deallocate memory.
        *  @param  __a  An allocator.
        *  @param  __p  Pointer to the memory to deallocate.
        *  @param  __n  The number of objects space was allocated for.
        *
        *  Calls <tt> a.deallocate(p, n) </tt>
       */
       static void deallocate(_Alloc& __a, pointer __p, size_type __n)
       { __a.deallocate(__p, __n); }

       /**
        *  @brief  Construct an object of type @a _Tp
        *  @param  __a  An allocator.
        *  @param  __p  Pointer to memory of suitable size and alignment for Tp
        *  @param  __args Constructor arguments.
        *
        *  Calls <tt> __a.construct(__p, std::forward<Args>(__args)...) </tt>
        *  if that expression is well-formed, otherwise uses placement-new
        *  to construct an object of type @a _Tp at location @a __p from the
        *  arguments @a __args...
       */
       template<typename _Tp, typename... _Args>
 	static auto construct(_Alloc& __a, _Tp* __p, _Args&&... __args)
 	-> decltype(_S_construct(__a, __p, std::forward<_Args>(__args)...))
 	{ _S_construct(__a, __p, std::forward<_Args>(__args)...); }

       /**
        *  @brief  Destroy an object of type @a _Tp
        *  @param  __a  An allocator.
        *  @param  __p  Pointer to the object to destroy
        *
        *  Calls @c __a.destroy(__p) if that expression is well-formed,
        *  otherwise calls @c __p->~_Tp()
       */
       template <class _Tp>
 	static void destroy(_Alloc& __a, _Tp* __p)
 	{ _S_destroy(__a, __p); }

       /**
        *  @brief  The maximum supported allocation size
        *  @param  __a  An allocator.
        *  @return @c __a.max_size() or @c numeric_limits<size_type>::max()
        *
        *  Returns @c __a.max_size() if that expression is well-formed,
        *  otherwise returns @c numeric_limits<size_type>::max()
       */
       static size_type max_size(const _Alloc& __a)
       { return _S_max_size(__a); }

       /**
        *  @brief  Obtain an allocator to use when copying a container.
        *  @param  __rhs  An allocator.
        *  @return @c __rhs.select_on_container_copy_construction() or @a __rhs
        *
        *  Returns @c __rhs.select_on_container_copy_construction() if that
        *  expression is well-formed, otherwise returns @a __rhs
       */
       static _Alloc
       select_on_container_copy_construction(const _Alloc& __rhs)
       { return _S_select(__rhs); }
     };

   template<typename _Alloc>
   template<typename _Alloc2>
     const bool allocator_traits<_Alloc>::__allocate_helper<_Alloc2>::value;

   template<typename _Alloc>
   template<typename _Tp, typename... _Args>
     const bool
     allocator_traits<_Alloc>::__construct_helper<_Tp, _Args...>::value;

   template<typename _Alloc>
   template<typename _Tp>
     const bool allocator_traits<_Alloc>::__destroy_helper<_Tp>::value;

   template<typename _Alloc>
   template<typename _Alloc2>
     const bool allocator_traits<_Alloc>::__maxsize_helper<_Alloc2>::value;

   template<typename _Alloc>
   template<typename _Alloc2>
     const bool allocator_traits<_Alloc>::__select_helper<_Alloc2>::value;

   template<typename _Alloc>
     inline void
     __do_alloc_on_copy(_Alloc& __one, const _Alloc& __two, true_type)
     { __one = __two; }

   template<typename _Alloc>
     inline void
     __do_alloc_on_copy(_Alloc&, const _Alloc&, false_type)
     { }

   template<typename _Alloc>
     inline void __alloc_on_copy(_Alloc& __one, const _Alloc& __two)
     {
       typedef allocator_traits<_Alloc> __traits;
       typedef typename __traits::propagate_on_container_copy_assignment __pocca;
       __do_alloc_on_copy(__one, __two, __pocca());
     }

   template<typename _Alloc>
     inline _Alloc __alloc_on_copy(const _Alloc& __a)
     {
       typedef allocator_traits<_Alloc> __traits;
       return __traits::select_on_container_copy_construction(__a);
     }

   template<typename _Alloc>
     inline void __do_alloc_on_move(_Alloc& __one, _Alloc& __two, true_type)
     { __one = std::move(__two); }

   template<typename _Alloc>
     inline void __do_alloc_on_move(_Alloc&, _Alloc&, false_type)
     { }

   template<typename _Alloc>
     inline void __alloc_on_move(_Alloc& __one, _Alloc& __two)
     {
       typedef allocator_traits<_Alloc> __traits;
       typedef typename __traits::propagate_on_container_move_assignment __pocma;
       __do_alloc_on_move(__one, __two, __pocma());
     }

   template<typename _Alloc>
     inline void __do_alloc_on_swap(_Alloc& __one, _Alloc& __two, true_type)
     {
       using std::swap;
       swap(__one, __two);
     }

   template<typename _Alloc>
     inline void __do_alloc_on_swap(_Alloc&, _Alloc&, false_type)
     { }

   template<typename _Alloc>
     inline void __alloc_on_swap(_Alloc& __one, _Alloc& __two)
     {
       typedef allocator_traits<_Alloc> __traits;
       typedef typename __traits::propagate_on_container_swap __pocs;
       __do_alloc_on_swap(__one, __two, __pocs());
     }

   template<typename _Alloc>
     class __is_copy_insertable_impl
     {
       typedef allocator_traits<_Alloc> _Traits;

       template<typename _Up, typename
 	       = decltype(_Traits::construct(std::declval<_Alloc&>(),
 					     std::declval<_Up*>(),
 					     std::declval<const _Up&>()))>
 	static true_type
 	_M_select(int);

       template<typename _Up>
 	static false_type
 	_M_select(...);

     public:
       typedef decltype(_M_select<typename _Alloc::value_type>(0)) type;
     };

   // true if _Alloc::value_type is CopyInsertable into containers using _Alloc
   template<typename _Alloc>
     struct __is_copy_insertable
     : __is_copy_insertable_impl<_Alloc>::type
     { };

   // std::allocator<_Tp> just requires CopyConstructible
   template<typename _Tp>
     struct __is_copy_insertable<allocator<_Tp>>
     : is_copy_constructible<_Tp>
     { };

   // Used to allow copy construction of unordered containers
   template<bool> struct __allow_copy_cons { };

   // Used to delete copy constructor of unordered containers
   template<>
     struct __allow_copy_cons<false>
     {
       __allow_copy_cons() = default;
       __allow_copy_cons(const __allow_copy_cons&) = delete;
       __allow_copy_cons(__allow_copy_cons&&) = default;
       __allow_copy_cons& operator=(const __allow_copy_cons&) = default;
       __allow_copy_cons& operator=(__allow_copy_cons&&) = default;
     };

   template<typename _Alloc>
     using __check_copy_constructible
       = __allow_copy_cons<__is_copy_insertable<_Alloc>::value>;

 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace std

 #endif
 #endif
	// 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);

	template<typename>
	static false_type __test(...);

	typedef decltype(__test<_Alloc>(0)) type;
	static const bool value = type::value;
	};

	template<typename _Alloc2>
	static typename
	enable_if<__allocate_helper<_Alloc2>::value, pointer>::type
	_S_allocate(_Alloc2& __a, size_type __n, const_void_pointer __hint)
	{ return __a.allocate(__n, __hint); }

	template<typename _Alloc2>
	static typename
	enable_if<!__allocate_helper<_Alloc2>::value, pointer>::type
	_S_allocate(_Alloc2& __a, size_type __n, ...)
	{ return __a.allocate(__n); }

	template<typename _Tp, typename... _Args>
	struct __construct_helper
	{
	template<typename _Alloc2,
	typename = decltype(std::declval<_Alloc2*>()->construct(
	std::declval<_Tp*>(), std::declval<_Args>()...))>
	static true_type __test(int);

	template<typename>
	static false_type __test(...);

	typedef decltype(__test<_Alloc>(0)) type;
	static const bool value = type::value;
	};

	template<typename _Tp, typename... _Args>
	static typename
	enable_if<__construct_helper<_Tp, _Args...>::value, void>::type
	_S_construct(_Alloc& __a, _Tp* __p, _Args&&... __args)
	{ __a.construct(__p, std::forward<_Args>(__args)...); }

	template<typename _Tp, typename... _Args>
	static typename
	enable_if<__and_<__not_<__construct_helper<_Tp, _Args...>>,
	is_constructible<_Tp, _Args...>>::value, void>::type
	_S_construct(_Alloc&, _Tp* __p, _Args&&... __args)
	{ ::new((void*)__p) _Tp(std::forward<_Args>(__args)...); }

	template<typename _Tp>
	struct __destroy_helper
	{
	template<typename _Alloc2,
	typename = decltype(std::declval<_Alloc2*>()->destroy(
	std::declval<_Tp*>()))>
	static true_type __test(int);

	template<typename>
	static false_type __test(...);

	typedef decltype(__test<_Alloc>(0)) type;
	static const bool value = type::value;
	};

	template<typename _Tp>
	static typename enable_if<__destroy_helper<_Tp>::value, void>::type
	_S_destroy(_Alloc& __a, _Tp* __p)
	{ __a.destroy(__p); }

	template<typename _Tp>
	static typename enable_if<!__destroy_helper<_Tp>::value, void>::type
	_S_destroy(_Alloc&, _Tp* __p)
	{ __p->~_Tp(); }

	template<typename _Alloc2>
	struct __maxsize_helper
	{
	template<typename _Alloc3,
	typename = decltype(std::declval<_Alloc3*>()->max_size())>
	static true_type __test(int);

	template<typename>
	static false_type __test(...);

	typedef decltype(__test<_Alloc2>(0)) type;
	static const bool value = type::value;
	};

	template<typename _Alloc2>
	static typename
	enable_if<__maxsize_helper<_Alloc2>::value, size_type>::type
	_S_max_size(_Alloc2& __a)
	{ return __a.max_size(); }

	template<typename _Alloc2>
	static typename
	enable_if<!__maxsize_helper<_Alloc2>::value, size_type>::type
	_S_max_size(_Alloc2&)
	{ return __gnu_cxx::__numeric_traits<size_type>::__max; }

	template<typename _Alloc2>
	struct __select_helper
	{
	template<typename _Alloc3, typename
	= decltype(std::declval<_Alloc3*>()
	->select_on_container_copy_construction())>
	static true_type __test(int);

	template<typename>
	static false_type __test(...);

	typedef decltype(__test<_Alloc2>(0)) type;
	static const bool value = type::value;
	};
	template<typename _Alloc2>
	static typename
	enable_if<__select_helper<_Alloc2>::value, _Alloc2>::type
	_S_select(_Alloc2& __a)
	{ return __a.select_on_container_copy_construction(); }

	template<typename _Alloc2>
	static typename
	enable_if<!__select_helper<_Alloc2>::value, _Alloc2>::type
	_S_select(_Alloc2& __a)
	{ return __a; }

	public:

	/**
	* @brief Allocate memory.
	* @param __a An allocator.
	* @param __n The number of objects to allocate space for.
	*
	* Calls @c a.allocate(n)
	*/
	static pointer
	allocate(_Alloc& __a, size_type __n)
	{ return __a.allocate(__n); }

	/**
	* @brief Allocate memory.
	* @param __a An allocator.
	* @param __n The number of objects to allocate space for.
	* @param __hint Aid to locality.
	* @return Memory of suitable size and alignment for @a n objects
	* of type @c value_type
	*
	* Returns <tt> a.allocate(n, hint) </tt> if that expression is
	* well-formed, otherwise returns @c a.allocate(n)
	*/
	static pointer
	allocate(_Alloc& __a, size_type __n, const_void_pointer __hint)
	{ return _S_allocate(__a, __n, __hint); }

	/**
	* @brief Deallocate memory.
	* @param __a An allocator.
	* @param __p Pointer to the memory to deallocate.
	* @param __n The number of objects space was allocated for.
	*
	* Calls <tt> a.deallocate(p, n) </tt>
	*/
	static void deallocate(_Alloc& __a, pointer __p, size_type __n)
	{ __a.deallocate(__p, __n); }

	/**
	* @brief Construct an object of type @a _Tp
	* @param __a An allocator.
	* @param __p Pointer to memory of suitable size and alignment for Tp
	* @param __args Constructor arguments.
	*
	* Calls <tt> __a.construct(__p, std::forward<Args>(__args)...) </tt>
	* if that expression is well-formed, otherwise uses placement-new
	* to construct an object of type @a _Tp at location @a __p from the
	* arguments @a __args...
	*/
	template<typename _Tp, typename... _Args>
	static auto construct(_Alloc& __a, _Tp* __p, _Args&&... __args)
	-> decltype(_S_construct(__a, __p, std::forward<_Args>(__args)...))
	{ _S_construct(__a, __p, std::forward<_Args>(__args)...); }

	/**
	* @brief Destroy an object of type @a _Tp
	* @param __a An allocator.
	* @param __p Pointer to the object to destroy
	*
	* Calls @c __a.destroy(__p) if that expression is well-formed,
	* otherwise calls @c __p->~_Tp()
	*/
	template <class _Tp>
	static void destroy(_Alloc& __a, _Tp* __p)
	{ _S_destroy(__a, __p); }

	/**
	* @brief The maximum supported allocation size
	* @param __a An allocator.
	* @return @c __a.max_size() or @c numeric_limits<size_type>::max()
	*
	* Returns @c __a.max_size() if that expression is well-formed,
	* otherwise returns @c numeric_limits<size_type>::max()
	*/
	static size_type max_size(const _Alloc& __a)
	{ return _S_max_size(__a); }

	/**
	* @brief Obtain an allocator to use when copying a container.
	* @param __rhs An allocator.
	* @return @c __rhs.select_on_container_copy_construction() or @a __rhs
	*
	* Returns @c __rhs.select_on_container_copy_construction() if that
	* expression is well-formed, otherwise returns @a __rhs
	*/
	static _Alloc
	select_on_container_copy_construction(const _Alloc& __rhs)
	{ return _S_select(__rhs); }
	};

	template<typename _Alloc>
	template<typename _Alloc2>
	const bool allocator_traits<_Alloc>::__allocate_helper<_Alloc2>::value;

	template<typename _Alloc>
	template<typename _Tp, typename... _Args>
	const bool
	allocator_traits<_Alloc>::__construct_helper<_Tp, _Args...>::value;

	template<typename _Alloc>
	template<typename _Tp>
	const bool allocator_traits<_Alloc>::__destroy_helper<_Tp>::value;

	template<typename _Alloc>
	template<typename _Alloc2>
	const bool allocator_traits<_Alloc>::__maxsize_helper<_Alloc2>::value;

	template<typename _Alloc>
	template<typename _Alloc2>
	const bool allocator_traits<_Alloc>::__select_helper<_Alloc2>::value;

	template<typename _Alloc>
	inline void
	__do_alloc_on_copy(_Alloc& __one, const _Alloc& __two, true_type)
	{ __one = __two; }

	template<typename _Alloc>
	inline void
	__do_alloc_on_copy(_Alloc&, const _Alloc&, false_type)
	{ }

	template<typename _Alloc>
	inline void __alloc_on_copy(_Alloc& __one, const _Alloc& __two)
	{
	typedef allocator_traits<_Alloc> __traits;
	typedef typename __traits::propagate_on_container_copy_assignment __pocca;
	__do_alloc_on_copy(__one, __two, __pocca());
	}

	template<typename _Alloc>
	inline _Alloc __alloc_on_copy(const _Alloc& __a)
	{
	typedef allocator_traits<_Alloc> __traits;
	return __traits::select_on_container_copy_construction(__a);
	}

	template<typename _Alloc>
	inline void __do_alloc_on_move(_Alloc& __one, _Alloc& __two, true_type)
	{ __one = std::move(__two); }

	template<typename _Alloc>
	inline void __do_alloc_on_move(_Alloc&, _Alloc&, false_type)
	{ }

	template<typename _Alloc>
	inline void __alloc_on_move(_Alloc& __one, _Alloc& __two)
	{
	typedef allocator_traits<_Alloc> __traits;
	typedef typename __traits::propagate_on_container_move_assignment __pocma;
	__do_alloc_on_move(__one, __two, __pocma());
	}

	template<typename _Alloc>
	inline void __do_alloc_on_swap(_Alloc& __one, _Alloc& __two, true_type)
	{
	using std::swap;
	swap(__one, __two);
	}

	template<typename _Alloc>
	inline void __do_alloc_on_swap(_Alloc&, _Alloc&, false_type)
	{ }

	template<typename _Alloc>
	inline void __alloc_on_swap(_Alloc& __one, _Alloc& __two)
	{
	typedef allocator_traits<_Alloc> __traits;
	typedef typename __traits::propagate_on_container_swap __pocs;
	__do_alloc_on_swap(__one, __two, __pocs());
	}

	template<typename _Alloc>
	class __is_copy_insertable_impl
	{
	typedef allocator_traits<_Alloc> _Traits;

	template<typename _Up, typename
	= decltype(_Traits::construct(std::declval<_Alloc&>(),
	std::declval<_Up*>(),
	std::declval<const _Up&>()))>
	static true_type
	_M_select(int);

	template<typename _Up>
	static false_type
	_M_select(...);

	public:
	typedef decltype(_M_select<typename _Alloc::value_type>(0)) type;
	};

	// true if _Alloc::value_type is CopyInsertable into containers using _Alloc
	template<typename _Alloc>
	struct __is_copy_insertable
	: __is_copy_insertable_impl<_Alloc>::type
	{ };

	// std::allocator<_Tp> just requires CopyConstructible
	template<typename _Tp>
	struct __is_copy_insertable<allocator<_Tp>>
	: is_copy_constructible<_Tp>
	{ };

	// Used to allow copy construction of unordered containers
	template<bool> struct __allow_copy_cons { };

	// Used to delete copy constructor of unordered containers
	template<>
	struct __allow_copy_cons<false>
	{
	__allow_copy_cons() = default;
	__allow_copy_cons(const __allow_copy_cons&) = delete;
	__allow_copy_cons(__allow_copy_cons&&) = default;
	__allow_copy_cons& operator=(const __allow_copy_cons&) = default;
	__allow_copy_cons& operator=(__allow_copy_cons&&) = default;
	};

	template<typename _Alloc>
	using __check_copy_constructible
	= __allow_copy_cons<__is_copy_insertable<_Alloc>::value>;

	_GLIBCXX_END_NAMESPACE_VERSION
	} // namespace std

	#endif
	#endif