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// Allocator that wraps "C" malloc -*- C++ -*-

// Copyright (C) 2001-2012 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 ext/malloc_allocator.h

 *  This file is a GNU extension to the Standard C++ Library.

 */

#ifndef _MALLOC_ALLOCATOR_H

#define _MALLOC_ALLOCATOR_H 1

#include <cstdlib>

#include <new>

#include <bits/functexcept.h>

#include <bits/move.h>

#if __cplusplus >= 201103L

#include <type_traits>

#endif

namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)

{

_GLIBCXX_BEGIN_NAMESPACE_VERSION

  using std::size_t;

  using std::ptrdiff_t;

  /**

   *  @brief  An allocator that uses malloc.

   *  @ingroup allocators

   *

   *  This is precisely the allocator defined in the C++ Standard.

   *    - all allocation calls malloc

   *    - all deallocation calls free

   */

  template<typename _Tp>

    class malloc_allocator

    {

    public:

      typedef size_t     size_type;

      typedef ptrdiff_t  difference_type;

      typedef _Tp*       pointer;

      typedef const _Tp* const_pointer;

      typedef _Tp&       reference;

      typedef const _Tp& const_reference;

      typedef _Tp        value_type;

      template<typename _Tp1>

        struct rebind

        { typedef malloc_allocator<_Tp1> other; };

#if __cplusplus >= 201103L

      // _GLIBCXX_RESOLVE_LIB_DEFECTS

      // 2103. propagate_on_container_move_assignment

      typedef std::true_type propagate_on_container_move_assignment;

#endif

      malloc_allocator() _GLIBCXX_USE_NOEXCEPT { }

      malloc_allocator(const malloc_allocator&) _GLIBCXX_USE_NOEXCEPT { }

      template<typename _Tp1>

        malloc_allocator(const malloc_allocator<_Tp1>&)

        _GLIBCXX_USE_NOEXCEPT { }

      ~malloc_allocator() _GLIBCXX_USE_NOEXCEPT { }

      pointer

      address(reference __x) const _GLIBCXX_NOEXCEPT

      { return std::__addressof(__x); }

      const_pointer

      address(const_reference __x) const _GLIBCXX_NOEXCEPT

      { return std::__addressof(__x); }

      // NB: __n is permitted to be 0.  The C++ standard says nothing

      // about what the return value is when __n == 0.

      pointer

      allocate(size_type __n, const void* = 0)

      {

        if (__n > this->max_size())

          std::__throw_bad_alloc();

        pointer __ret = static_cast<_Tp*>(std::malloc(__n * sizeof(_Tp)));

        if (!__ret)

          std::__throw_bad_alloc();

        return __ret;

      }

      // __p is not permitted to be a null pointer.

      void

      deallocate(pointer __p, size_type)

      { std::free(static_cast<void*>(__p)); }

      size_type

      max_size() const _GLIBCXX_USE_NOEXCEPT

      { return size_t(-1) / sizeof(_Tp); }

#if __cplusplus >= 201103L

      template<typename _Up, typename... _Args>

        void

        construct(_Up* __p, _Args&&... __args)

        { ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }

      template<typename _Up>

        void

        destroy(_Up* __p) { __p->~_Up(); }

#else

      // _GLIBCXX_RESOLVE_LIB_DEFECTS

      // 402. wrong new expression in [some_] allocator::construct

      void

      construct(pointer __p, const _Tp& __val)

      { ::new((void *)__p) value_type(__val); }

      void

      destroy(pointer __p) { __p->~_Tp(); }

#endif

    };

  template<typename _Tp>

    inline bool

    operator==(const malloc_allocator<_Tp>&, const malloc_allocator<_Tp>&)

    { return true; }

  template<typename _Tp>

    inline bool

    operator!=(const malloc_allocator<_Tp>&, const malloc_allocator<_Tp>&)

    { return false; }

_GLIBCXX_END_NAMESPACE_VERSION

} // namespace

#endif