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// array allocator -*- C++ -*-

// Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009

// 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/array_allocator.h

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

 */

#ifndef _ARRAY_ALLOCATOR_H

#define _ARRAY_ALLOCATOR_H 1

#include <cstddef>

#include <new>

#include <bits/functexcept.h>

#include <tr1/array>

#include <bits/move.h>

_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)

 using std::size_t;

 using std::ptrdiff_t;

  /// Base class.

 template<typename _Tp>

    class array_allocator_base

    {

    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;

      pointer

      address(reference __x) const { return &__x; }

      const_pointer

      address(const_reference __x) const { return &__x; }

      void

      deallocate(pointer, size_type)

      {

        // Does nothing.

      }

      size_type

      max_size() const throw()

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

      // _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); }

#ifdef __GXX_EXPERIMENTAL_CXX0X__

      template<typename... _Args>

        void

        construct(pointer __p, _Args&&... __args)

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

#endif

      void

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

    };

  /**

   *  @brief  An allocator that uses previously allocated memory.

   *  This memory can be externally, globally, or otherwise allocated.

   *  @ingroup allocators

   */

  template<typename _Tp, typename _Array = std::tr1::array<_Tp, 1> >

    class array_allocator : public array_allocator_base<_Tp>

    {

    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;

      typedef _Array            array_type;

    private:

      array_type*       _M_array;

      size_type         _M_used;

    public:

     template<typename _Tp1, typename _Array1 = _Array>

        struct rebind

        { typedef array_allocator<_Tp1, _Array1> other; };

      array_allocator(array_type* __array = NULL) throw()

      : _M_array(__array), _M_used(size_type()) { }

      array_allocator(const array_allocator& __o)  throw()

      : _M_array(__o._M_array), _M_used(__o._M_used) { }

      template<typename _Tp1, typename _Array1>

        array_allocator(const array_allocator<_Tp1, _Array1>&) throw()

        : _M_array(NULL), _M_used(size_type()) { }

      ~array_allocator() throw() { }

      pointer

      allocate(size_type __n, const void* = 0)

      {

        if (_M_array == 0 || _M_used + __n > _M_array->size())

          std::__throw_bad_alloc();

        pointer __ret = _M_array->begin() + _M_used;

        _M_used += __n;

        return __ret;

      }

    };

  template<typename _Tp, typename _Array>

    inline bool

    operator==(const array_allocator<_Tp, _Array>&,

               const array_allocator<_Tp, _Array>&)

    { return true; }

  template<typename _Tp, typename _Array>

    inline bool

    operator!=(const array_allocator<_Tp, _Array>&,

               const array_allocator<_Tp, _Array>&)

    { return false; }

_GLIBCXX_END_NAMESPACE

#endif