126 lines
3.8 KiB
C++
126 lines
3.8 KiB
C++
// Allocator that wraps operator new -*- C++ -*-
|
|
|
|
// Copyright (C) 2001, 2002, 2003, 2004, 2005 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 2, 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.
|
|
|
|
// You should have received a copy of the GNU General Public License along
|
|
// with this library; see the file COPYING. If not, write to the Free
|
|
// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
|
|
// USA.
|
|
|
|
// As a special exception, you may use this file as part of a free software
|
|
// library without restriction. Specifically, if other files instantiate
|
|
// templates or use macros or inline functions from this file, or you compile
|
|
// this file and link it with other files to produce an executable, this
|
|
// file does not by itself cause the resulting executable to be covered by
|
|
// the GNU General Public License. This exception does not however
|
|
// invalidate any other reasons why the executable file might be covered by
|
|
// the GNU General Public License.
|
|
|
|
/** @file ext/new_allocator.h
|
|
* This file is a GNU extension to the Standard C++ Library.
|
|
*/
|
|
|
|
#ifndef _NEW_ALLOCATOR_H
|
|
#define _NEW_ALLOCATOR_H 1
|
|
|
|
#include <new>
|
|
#include <bits/functexcept.h>
|
|
|
|
_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
|
|
|
|
using std::size_t;
|
|
using std::ptrdiff_t;
|
|
|
|
/**
|
|
* @brief An allocator that uses global new, as per [20.4].
|
|
*
|
|
* This is precisely the allocator defined in the C++ Standard.
|
|
* - all allocation calls operator new
|
|
* - all deallocation calls operator delete
|
|
*/
|
|
template<typename _Tp>
|
|
class new_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 new_allocator<_Tp1> other; };
|
|
|
|
new_allocator() throw() { }
|
|
|
|
new_allocator(const new_allocator&) throw() { }
|
|
|
|
template<typename _Tp1>
|
|
new_allocator(const new_allocator<_Tp1>&) throw() { }
|
|
|
|
~new_allocator() throw() { }
|
|
|
|
pointer
|
|
address(reference __x) const { return &__x; }
|
|
|
|
const_pointer
|
|
address(const_reference __x) const { return &__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 (__builtin_expect(__n > this->max_size(), false))
|
|
std::__throw_bad_alloc();
|
|
|
|
return static_cast<_Tp*>(::operator new(__n * sizeof(_Tp)));
|
|
}
|
|
|
|
// __p is not permitted to be a null pointer.
|
|
void
|
|
deallocate(pointer __p, size_type)
|
|
{ ::operator delete(__p); }
|
|
|
|
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(__p) _Tp(__val); }
|
|
|
|
void
|
|
destroy(pointer __p) { __p->~_Tp(); }
|
|
};
|
|
|
|
template<typename _Tp>
|
|
inline bool
|
|
operator==(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
|
|
{ return true; }
|
|
|
|
template<typename _Tp>
|
|
inline bool
|
|
operator!=(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
|
|
{ return false; }
|
|
|
|
_GLIBCXX_END_NAMESPACE
|
|
|
|
#endif
|