release/src-rt-6.x.4708/toolchains/hndtools-arm-linux-2.6.36-uclibc-4.5.3/arm-brcm-linux-uclibcgnueabi/include/c++/4.5.3/ext/cast.h

   1 // <cast.h> -*- C++ -*-
   2
   3 // Copyright (C) 2008, 2009 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // Under Section 7 of GPL version 3, you are granted additional
  17 // permissions described in the GCC Runtime Library Exception, version
  18 // 3.1, as published by the Free Software Foundation.
  19
  20 // You should have received a copy of the GNU General Public License and
  21 // a copy of the GCC Runtime Library Exception along with this program;
  22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 // <http://www.gnu.org/licenses/>.
  24
  25 #ifndef _CAST_H
  26 #define _CAST_H 1
  27
  28 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
  29
  30   /**
  31    * These functions are here to allow containers to support non standard
  32    * pointer types.  For normal pointers, these resolve to the use of the
  33    * standard cast operation.  For other types the functions will perform
  34    * the apprpriate cast to/from the custom pointer class so long as that
  35    * class meets the following conditions:
  36    * 1) has a typedef element_type which names tehe type it points to.
  37    * 2) has a get() const method which returns element_type*.
  38    * 3) has a constructor which can take one element_type* argument.
  39    */
  40
  41   /**
  42    * This type supports the semantics of the pointer cast operators (below.)
  43    */
  44   template<typename _ToType>
  45     struct _Caster
  46     { typedef typename _ToType::element_type*  type; };
  47
  48   template<typename _ToType>
  49     struct _Caster<_ToType*>
  50     { typedef _ToType*  type; };
  51
  52   /**
  53    * Casting operations for cases where _FromType is not a standard pointer.
  54    * _ToType can be a standard or non-standard pointer.  Given that _FromType
  55    * is not a pointer, it must have a get() method that returns the standard
  56    * pointer equivalent of the address it points to, and must have an
  57    * element_type typedef which names the type it points to.
  58    */
  59   template<typename _ToType, typename _FromType>
  60     inline _ToType
  61     __static_pointer_cast(const _FromType& __arg)
  62     { return _ToType(static_cast<typename _Caster<_ToType>::
  63                      type>(__arg.get())); }
  64
  65   template<typename _ToType, typename _FromType>
  66     inline _ToType
  67     __dynamic_pointer_cast(const _FromType& __arg)
  68     { return _ToType(dynamic_cast<typename _Caster<_ToType>::
  69                      type>(__arg.get())); }
  70
  71   template<typename _ToType, typename _FromType>
  72     inline _ToType
  73     __const_pointer_cast(const _FromType& __arg)
  74     { return _ToType(const_cast<typename _Caster<_ToType>::
  75                      type>(__arg.get())); }
  76
  77   template<typename _ToType, typename _FromType>
  78     inline _ToType
  79     __reinterpret_pointer_cast(const _FromType& __arg)
  80     { return _ToType(reinterpret_cast<typename _Caster<_ToType>::
  81                      type>(__arg.get())); }
  82
  83   /**
  84    * Casting operations for cases where _FromType is a standard pointer.
  85    * _ToType can be a standard or non-standard pointer.
  86    */
  87   template<typename _ToType, typename _FromType>
  88     inline _ToType
  89     __static_pointer_cast(_FromType* __arg)
  90     { return _ToType(static_cast<typename _Caster<_ToType>::
  91                      type>(__arg)); }
  92
  93   template<typename _ToType, typename _FromType>
  94     inline _ToType
  95     __dynamic_pointer_cast(_FromType* __arg)
  96     { return _ToType(dynamic_cast<typename _Caster<_ToType>::
  97                      type>(__arg)); }
  98
  99   template<typename _ToType, typename _FromType>
 100     inline _ToType
 101     __const_pointer_cast(_FromType* __arg)
 102     { return _ToType(const_cast<typename _Caster<_ToType>::
 103                      type>(__arg)); }
 104
 105   template<typename _ToType, typename _FromType>
 106     inline _ToType
 107     __reinterpret_pointer_cast(_FromType* __arg)
 108     { return _ToType(reinterpret_cast<typename _Caster<_ToType>::
 109                      type>(__arg)); }
 110
 111 _GLIBCXX_END_NAMESPACE
 112
 113 #endif // _CAST_H