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// Guarded Allocation -*- C++ -*-

// Copyright (C) 2014-2015 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

// .

/** @file bits/allocated_ptr.h

 *  This is an internal header file, included by other library headers.

 *  Do not attempt to use it directly. @headername{memory}

 */

#ifndef _ALLOCATED_PTR_H

#define _ALLOCATED_PTR_H 1

#if __cplusplus < 201103L

# include 

#else

# include 

# include 

# include 

namespace std _GLIBCXX_VISIBILITY(default)

{

_GLIBCXX_BEGIN_NAMESPACE_VERSION

  /// Non-standard RAII type for managing pointers obtained from allocators.

  template

    struct __allocated_ptr

    {

      using pointer = typename allocator_traits<_Alloc>::pointer;

      using value_type = typename allocator_traits<_Alloc>::value_type;

      /// Take ownership of __ptr

      __allocated_ptr(_Alloc& __a, pointer __ptr) noexcept

      : _M_alloc(&__a), _M_ptr(__ptr)

      { }

      /// Convert __ptr to allocator's pointer type and take ownership of it

      template

	       typename _Req = _Require>>

      __allocated_ptr(_Alloc& __a, _Ptr __ptr)

      : _M_alloc(&__a), _M_ptr(pointer_traits::pointer_to(*__ptr))

      { }

      /// Transfer ownership of the owned pointer

      __allocated_ptr(__allocated_ptr&& __gd) noexcept

      : _M_alloc(__gd._M_alloc), _M_ptr(__gd._M_ptr)

      { __gd._M_ptr = nullptr; }

      /// Deallocate the owned pointer

      ~__allocated_ptr()

      {

	if (_M_ptr != nullptr)

	  std::allocator_traits<_Alloc>::deallocate(*_M_alloc, _M_ptr, 1);

      }

      /// Release ownership of the owned pointer

      __allocated_ptr&

      operator=(std::nullptr_t) noexcept

      {

	_M_ptr = nullptr;

	return *this;

      }

      /// Get the address that the owned pointer refers to.

      value_type* get() { return _S_raw_ptr(_M_ptr); }

    private:

      value_type* _S_raw_ptr(value_type* __ptr) { return __ptr; }

      template

	auto _S_raw_ptr(_Ptr __ptr) -> decltype(_S_raw_ptr(__ptr.operator->()))

	{ return _S_raw_ptr(__ptr.operator->()); }

      _Alloc* _M_alloc;

      pointer _M_ptr;

    };

  /// Allocate space for a single object using __a

  template

    __allocated_ptr<_Alloc>

    __allocate_guarded(_Alloc& __a)

    {

      return { __a, std::allocator_traits<_Alloc>::allocate(__a, 1) };

    }

_GLIBCXX_END_NAMESPACE_VERSION

} // namespace std

#endif

#endif