kdecore Library API Documentation

ksharedptr.h

00001 /* This file is part of the KDE libraries
00002    Copyright (c) 1999 Waldo Bastian <bastian@kde.org>
00003 
00004    This library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Library General Public
00006    License version 2 as published by the Free Software Foundation.
00007 
00008    This library is distributed in the hope that it will be useful,
00009    but WITHOUT ANY WARRANTY; without even the implied warranty of
00010    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00011    Library General Public License for more details.
00012 
00013    You should have received a copy of the GNU Library General Public License
00014    along with this library; see the file COPYING.LIB.  If not, write to
00015    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
00016    Boston, MA 02111-1307, USA.
00017 */
00018 #ifndef KSharedPTR_H
00019 #define KSharedPTR_H
00020 
00021 #include "kdelibs_export.h"
00022 
00041 class KDECORE_EXPORT KShared {
00042 public:
00047    KShared() : count(0) { }
00048 
00053    KShared( const KShared & ) : count(0) { }
00054 
00058    KShared &operator=(const KShared & ) { return *this; }
00059 
00063    void _KShared_ref() const { count++; }
00064 
00069    void _KShared_unref() const { if (!--count) delete this; }
00070 
00076    int _KShared_count() const { return count; }
00077 
00078 protected:
00079    virtual ~KShared() { }
00080 private:
00081    mutable int count;
00082 };
00083 
00101 template< class T >
00102 class KSharedPtr
00103 {
00104 public:
00108   KSharedPtr()
00109     : ptr(0) { }
00114   KSharedPtr( T* t )
00115     : ptr(t) { if ( ptr ) ptr->_KShared_ref(); }
00116 
00121   KSharedPtr( const KSharedPtr& p )
00122     : ptr(p.ptr) { if ( ptr ) ptr->_KShared_ref(); }
00123 
00128   ~KSharedPtr() { if ( ptr ) ptr->_KShared_unref(); }
00129 
00130   KSharedPtr<T>& operator= ( const KSharedPtr<T>& p ) {
00131     if ( ptr == p.ptr ) return *this;
00132     if ( ptr ) ptr->_KShared_unref();
00133     ptr = p.ptr;
00134     if ( ptr ) ptr->_KShared_ref();
00135     return *this;
00136   }
00137   KSharedPtr<T>& operator= ( T* p ) {
00138     if ( ptr == p ) return *this;
00139     if ( ptr ) ptr->_KShared_unref();
00140     ptr = p;
00141     if ( ptr ) ptr->_KShared_ref();
00142     return *this;
00143   }
00144   bool operator== ( const KSharedPtr<T>& p ) const { return ( ptr == p.ptr ); }
00145   bool operator!= ( const KSharedPtr<T>& p ) const { return ( ptr != p.ptr ); }
00146   bool operator== ( const T* p ) const { return ( ptr == p ); }
00147   bool operator!= ( const T* p ) const { return ( ptr != p ); }
00148   bool operator!() const { return ( ptr == 0 ); }
00149   operator T*() const { return ptr; }
00150 
00155   T* data() { return ptr; }
00156 
00161   const T* data() const { return ptr; }
00162 
00163   const T& operator*() const { return *ptr; }
00164   T& operator*() { return *ptr; }
00165   const T* operator->() const { return ptr; }
00166   T* operator->() { return ptr; }
00167 
00172   int count() const { return ptr->_KShared_count(); } // for debugging purposes
00173 private:
00174   T* ptr;
00175 };
00176 
00177 #endif
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This file is part of the documentation for kdecore Library Version 3.3.90.
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