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pointer.h

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00001 /* This file is part of the KDE libraries
00002     Copyright (C) 2005, 2006 Ian Reinhart Geiser <geiseri@kde.org>
00003     Copyright (C) 2005, 2006 Matt Broadstone <mbroadst@gmail.com>
00004     Copyright (C) 2005, 2006 Richard J. Moore <rich@kde.org>
00005     Copyright (C) 2005, 2006 Erik L. Bunce <kde@bunce.us>
00006 
00007     This library is free software; you can redistribute it and/or
00008     modify it under the terms of the GNU Library General Public
00009     License as published by the Free Software Foundation; either
00010     version 2 of the License, or (at your option) any later version.
00011 
00012     This library is distributed in the hope that it will be useful,
00013     but WITHOUT ANY WARRANTY; without even the implied warranty of
00014     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015     Library General Public License for more details.
00016 
00017     You should have received a copy of the GNU Library General Public License
00018     along with this library; see the file COPYING.LIB.  If not, write to
00019     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00020     Boston, MA 02110-1301, USA.
00021 */
00022 
00023 
00024 #ifndef POINTER_H
00025 #define POINTER_H
00026 
00027 #include <algorithm>
00028 #include <typeinfo>
00029 #include <QtCore/QVariant>
00030 
00031 struct PointerBase
00032 {
00033 public:
00034     virtual ~PointerBase() {;}
00035     virtual void cleanup() = 0;
00036     virtual const std::type_info &type() const = 0;
00037     virtual void *voidStar() = 0;
00038 };
00039 Q_DECLARE_METATYPE(PointerBase*)
00040 
00041 template<typename ValueType>
00042 struct Pointer : public PointerBase
00043 {
00044 public:
00045     Pointer( ValueType *value) : ptr(value)
00046     {
00047 //         qDebug("new pointer %s %0x", typeid(ValueType).name(), value);
00048     }
00049     ~Pointer( )
00050     {
00051         
00052     }
00053     void cleanup()
00054     {
00055 //         qDebug("delete pointer %s %0x", typeid(ValueType).name(), ptr );
00056         delete ptr;
00057         ptr=0L;
00058     }
00059     const std::type_info &type() const
00060     {
00061         return typeid(ValueType);
00062     }
00063 
00064     void *voidStar()
00065     {
00066         return (void*)ptr;
00067     }
00068 
00069     ValueType *ptr;
00070 };
00071 
00072 template<typename ValueType>
00073 struct Value : public PointerBase
00074 {
00075 public:
00076     Value( ValueType val) : value(val)
00077     {
00078             //qDebug("new value %s", typeid(ValueType).name());
00079     }
00080     ~Value( )
00081     {
00082             //qDebug("delete value");
00083     }
00084 
00085     void cleanup()
00086     {
00087 
00088     }
00089 
00090     const std::type_info &type() const
00091     {
00092         return typeid(ValueType);
00093     }
00094 
00095     void *voidStar()
00096     {
00097         return (void*)&value;
00098     }
00099 
00100     ValueType value;
00101 };
00102 
00103 struct NullPtr : public PointerBase
00104 {
00105     NullPtr( )
00106     {
00107         ;
00108     }
00109     ~NullPtr( )
00110     {
00111         ;
00112     }
00113     void cleanup()
00114     {
00115         ;
00116     }
00117 
00118     const std::type_info &type() const
00119     {
00120         return typeid(NullPtr);
00121     }
00122 
00123     void *voidStar()
00124     {
00125         return (void*)0;
00126     }
00127 
00128 };
00129 
00130 template<typename ValueType> 
00131 ValueType *pointer_cast( PointerBase *pointer )
00132 {
00133 //    qDebug("pointers %s %s", typeid(ValueType).name(), pointer->type().name() );
00134    if( typeid(ValueType) != pointer->type() )
00135        return 0L;
00136   Pointer<ValueType> *upcast = static_cast< Pointer<ValueType> *>(pointer);
00137   return upcast->ptr;
00138 }
00139 
00140 #endif
00141 
00142 //kate: indent-spaces on; indent-width 4; replace-tabs on; indent-mode cstyle;
00143 

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