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// array allocator -*- C++ -*-
// Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010
// 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 <bits/c++config.h>
#include <new>
#include <bits/functexcept.h>
#include <tr1/array>
#include <bits/move.h>
namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
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 std::__addressof(__x); }
const_pointer
address(const_reference __x) const { return std::__addressof(__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 = 0) 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(0), _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_VERSION
} // namespace
#endif
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