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// Uses-allocator Construction -*- C++ -*-

// Copyright (C) 2010, 2011 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/>.

#ifndef _USES_ALLOCATOR_H

#define _USES_ALLOCATOR_H 1

#if __cplusplus < 201103L

# include <bits/c++0x_warning.h>

#else

#include <type_traits>

namespace std _GLIBCXX_VISIBILITY(default)

{

_GLIBCXX_BEGIN_NAMESPACE_VERSION

  /// [allocator.tag]

  struct allocator_arg_t { };

  constexpr allocator_arg_t allocator_arg = allocator_arg_t();

_GLIBCXX_HAS_NESTED_TYPE(allocator_type)

  template<typename _Tp, typename _Alloc,

           bool = __has_allocator_type<_Tp>::value>

    struct __uses_allocator_helper

    : public false_type { };

  template<typename _Tp, typename _Alloc>

    struct __uses_allocator_helper<_Tp, _Alloc, true>

    : public integral_constant<bool, is_convertible<_Alloc,

                                     typename _Tp::allocator_type>::value>

    { };

  /// [allocator.uses.trait]

  template<typename _Tp, typename _Alloc>

    struct uses_allocator

    : public integral_constant<bool,

                               __uses_allocator_helper<_Tp, _Alloc>::value>

    { };

  template<typename _Tp, typename _Alloc, typename... _Args>

    struct __uses_allocator_arg

    : is_constructible<_Tp, _Alloc, _Args...>

    { static_assert( uses_allocator<_Tp, _Alloc>::value, "uses allocator" ); };

  struct __uses_alloc_base { };

  struct __uses_alloc0 : __uses_alloc_base

  { struct _Anything { _Anything(...) { } } _M_a; };

  template<typename _Alloc>

    struct __uses_alloc1 : __uses_alloc_base { const _Alloc* _M_a; };

  template<typename _Alloc>

    struct __uses_alloc2 : __uses_alloc_base { const _Alloc* _M_a; };

  template<bool, typename _Alloc, typename... _Args>

    struct __uses_alloc;

  template<typename _Tp, typename _Alloc, typename... _Args>

    struct __uses_alloc<true, _Tp, _Alloc, _Args...>

    : conditional<

        is_constructible<_Tp, allocator_arg_t, _Alloc, _Args...>::value,

        __uses_alloc1<_Alloc>,

        __uses_alloc2<_Alloc>>::type

    { };

  template<typename _Tp, typename _Alloc, typename... _Args>

    struct __uses_alloc<false, _Tp, _Alloc, _Args...>

    : __uses_alloc0 { };

  template<typename _Tp, typename _Alloc, typename... _Args>

    struct __uses_alloc_impl

    : __uses_alloc<uses_allocator<_Tp, _Alloc>::value, _Tp,  _Alloc, _Args...>

    { };

  template<typename _Tp, typename _Alloc, typename... _Args>

    __uses_alloc_impl<_Tp, _Alloc, _Args...>

    __use_alloc(const _Alloc& __a)

    {

      __uses_alloc_impl<_Tp, _Alloc, _Args...> __ret;

      __ret._M_a = &__a;

      return __ret;

    }

_GLIBCXX_END_NAMESPACE_VERSION

} // namespace std

#endif

#endif