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2008-11-07 Paolo Carlini <paolo.carlini@oracle.com>

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* Complete last commit.

From-SVN: r141677
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Paolo Carlini 2008-11-07 15:44:35 +00:00
parent 8d200e06a4
commit b5b3f66baa
1 changed files with 184 additions and 0 deletions
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libstdc++-v3/include/ext/extptr_allocator.h Normal file
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// <extptr_allocator.h> -*- C++ -*-
// Copyright (C) 2008 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/extptr_allocator.h
* @author Bob Walters
*
* An example allocator which uses an alternative pointer type from
* bits/pointer.h. Supports test cases which confirm container support
* for alternative pointers.
*/
#ifndef _EXTPTR_ALLOCATOR_H
#define _EXTPTR_ALLOCATOR_H 1
#include <memory>
#include <limits>
#include <ext/pointer.h>
using __gnu_cxx::_Pointer_adapter;
using __gnu_cxx::_Relative_pointer_impl;
_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
// forward declaration
template<typename _Tp>
class _ExtPtr_allocator;
// _ExtPtr_allocator<void> specialization.
template<>
class _ExtPtr_allocator<void>
{
public:
typedef size_t size_type;
typedef ptrdiff_t difference_type;
typedef void value_type;
// Note the non-standard pointer types
typedef _Pointer_adapter<_Relative_pointer_impl<void> > pointer;
typedef _Pointer_adapter<_Relative_pointer_impl<const void> >
const_pointer;
template<typename _Up>
struct rebind
{ typedef _ExtPtr_allocator<_Up> other; };
};
/**
* @brief An example allocator which uses a non-standard pointer type.
*
* This allocator specifies that containers use a 'relative pointer' as it's
* pointer type. (See bits/pointer.h) Memory allocation in this example
* is still performed using std::allocator.
*/
template<typename _Tp>
class _ExtPtr_allocator
{
public:
typedef size_t size_type;
typedef ptrdiff_t difference_type;
// Note the non-standard pointer types.
typedef _Pointer_adapter<_Relative_pointer_impl<_Tp> > pointer;
typedef _Pointer_adapter<_Relative_pointer_impl<const _Tp> > const_pointer;
typedef _Tp& reference;
typedef const _Tp& const_reference;
typedef _Tp value_type;
template<typename _Up>
struct rebind
{ typedef _ExtPtr_allocator<_Up> other; };
_ExtPtr_allocator() throw()
: _M_real_alloc() { }
_ExtPtr_allocator(const _ExtPtr_allocator &__rarg) throw()
: _M_real_alloc(__rarg._M_real_alloc) { }
template<class _Up>
_ExtPtr_allocator(const _ExtPtr_allocator<_Up>& __rarg) throw()
: _M_real_alloc(__rarg._M_getUnderlyingImp()) { }
~_ExtPtr_allocator() throw()
{ }
pointer address(reference __x) const
{ return &__x; }
const_pointer address(const_reference __x) const
{ return &__x; }
pointer allocate(size_type __n, void* __hint = 0)
{ return _M_real_alloc.allocate(__n,__hint); }
void deallocate(pointer __p, size_type __n)
{ _M_real_alloc.deallocate(__p.get(), __n); }
size_type max_size() const throw()
{ return std::numeric_limits<size_type>::max() / sizeof(_Tp); }
void construct(pointer __p, const _Tp& __val)
{ ::new(__p.get()) _Tp(__val); }
#ifdef __GXX_EXPERIMENTAL_CXX0X__
template<typename... _Args>
void
construct(pointer __p, _Args&&... __args)
{ ::new(__p.get()) _Tp(std::forward<_Args>(__args)...); }
#endif
void destroy(pointer __p)
{ __p->~_Tp(); }
template<typename _Up>
inline bool
operator==(const _ExtPtr_allocator<_Up>& __rarg)
{ return _M_real_alloc == __rarg._M_getUnderlyingImp(); }
inline bool
operator==(const _ExtPtr_allocator& __rarg)
{ return _M_real_alloc == __rarg._M_real_alloc; }
template<typename _Up>
inline bool
operator!=(const _ExtPtr_allocator<_Up>& __rarg)
{ return _M_real_alloc != __rarg._M_getUnderlyingImp(); }
inline bool
operator!=(const _ExtPtr_allocator& __rarg)
{ return _M_real_alloc != __rarg._M_real_alloc; }
template<typename _Up>
inline friend void
swap(_ExtPtr_allocator<_Up>& __larg, _ExtPtr_allocator<_Up>& __rarg);
// A method specific to this implementation.
const std::allocator<_Tp>&
_M_getUnderlyingImp() const
{ return _M_real_alloc; }
private:
// simlated state data.
std::allocator<_Tp> _M_real_alloc;
};
template<typename _Tp>
inline void
swap(_ExtPtr_allocator<_Tp>& __larg, _ExtPtr_allocator<_Tp>& __rarg)
{
std::allocator<_Tp> temp( __rarg._M_real_alloc );
__rarg._M_real_alloc = __larg._M_real_alloc;
__larg._M_real_alloc = temp;
}
_GLIBCXX_END_NAMESPACE
#endif /* _EXTPTR_ALLOCATOR_H */