forked from KolibriOS/kolibrios
122 lines
4.3 KiB
C++
122 lines
4.3 KiB
C++
// <cast.h> -*- C++ -*-
|
|
|
|
// Copyright (C) 2008-2013 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/cast.h
|
|
* This is an internal header file, included by other library headers.
|
|
* Do not attempt to use it directly. @headername{ext/pointer.h}
|
|
*/
|
|
|
|
#ifndef _GLIBCXX_CAST_H
|
|
#define _GLIBCXX_CAST_H 1
|
|
|
|
namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
|
|
{
|
|
_GLIBCXX_BEGIN_NAMESPACE_VERSION
|
|
|
|
/**
|
|
* These functions are here to allow containers to support non standard
|
|
* pointer types. For normal pointers, these resolve to the use of the
|
|
* standard cast operation. For other types the functions will perform
|
|
* the apprpriate cast to/from the custom pointer class so long as that
|
|
* class meets the following conditions:
|
|
* 1) has a typedef element_type which names tehe type it points to.
|
|
* 2) has a get() const method which returns element_type*.
|
|
* 3) has a constructor which can take one element_type* argument.
|
|
*/
|
|
|
|
/**
|
|
* This type supports the semantics of the pointer cast operators (below.)
|
|
*/
|
|
template<typename _ToType>
|
|
struct _Caster
|
|
{ typedef typename _ToType::element_type* type; };
|
|
|
|
template<typename _ToType>
|
|
struct _Caster<_ToType*>
|
|
{ typedef _ToType* type; };
|
|
|
|
/**
|
|
* Casting operations for cases where _FromType is not a standard pointer.
|
|
* _ToType can be a standard or non-standard pointer. Given that _FromType
|
|
* is not a pointer, it must have a get() method that returns the standard
|
|
* pointer equivalent of the address it points to, and must have an
|
|
* element_type typedef which names the type it points to.
|
|
*/
|
|
template<typename _ToType, typename _FromType>
|
|
inline _ToType
|
|
__static_pointer_cast(const _FromType& __arg)
|
|
{ return _ToType(static_cast<typename _Caster<_ToType>::
|
|
type>(__arg.get())); }
|
|
|
|
template<typename _ToType, typename _FromType>
|
|
inline _ToType
|
|
__dynamic_pointer_cast(const _FromType& __arg)
|
|
{ return _ToType(dynamic_cast<typename _Caster<_ToType>::
|
|
type>(__arg.get())); }
|
|
|
|
template<typename _ToType, typename _FromType>
|
|
inline _ToType
|
|
__const_pointer_cast(const _FromType& __arg)
|
|
{ return _ToType(const_cast<typename _Caster<_ToType>::
|
|
type>(__arg.get())); }
|
|
|
|
template<typename _ToType, typename _FromType>
|
|
inline _ToType
|
|
__reinterpret_pointer_cast(const _FromType& __arg)
|
|
{ return _ToType(reinterpret_cast<typename _Caster<_ToType>::
|
|
type>(__arg.get())); }
|
|
|
|
/**
|
|
* Casting operations for cases where _FromType is a standard pointer.
|
|
* _ToType can be a standard or non-standard pointer.
|
|
*/
|
|
template<typename _ToType, typename _FromType>
|
|
inline _ToType
|
|
__static_pointer_cast(_FromType* __arg)
|
|
{ return _ToType(static_cast<typename _Caster<_ToType>::
|
|
type>(__arg)); }
|
|
|
|
template<typename _ToType, typename _FromType>
|
|
inline _ToType
|
|
__dynamic_pointer_cast(_FromType* __arg)
|
|
{ return _ToType(dynamic_cast<typename _Caster<_ToType>::
|
|
type>(__arg)); }
|
|
|
|
template<typename _ToType, typename _FromType>
|
|
inline _ToType
|
|
__const_pointer_cast(_FromType* __arg)
|
|
{ return _ToType(const_cast<typename _Caster<_ToType>::
|
|
type>(__arg)); }
|
|
|
|
template<typename _ToType, typename _FromType>
|
|
inline _ToType
|
|
__reinterpret_pointer_cast(_FromType* __arg)
|
|
{ return _ToType(reinterpret_cast<typename _Caster<_ToType>::
|
|
type>(__arg)); }
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace
|
|
|
|
#endif // _GLIBCXX_CAST_H
|