KDECore

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., 51 Franklin Street, Fifth Floor,
00016    Boston, MA 02110-1301, USA.
00017 */
00018 #ifndef KSharedPTR_H
00019 #define KSharedPTR_H
00020 
00021 #include "kdelibs_export.h"
00022 
00040 class KDECORE_EXPORT KShared {
00041 public:
00046    KShared() : count(0) { }
00047 
00052    KShared( const KShared & ) : count(0) { }
00053 
00057    KShared &operator=(const KShared & ) { return *this; }
00058 
00062    void _KShared_ref() const { count++; }
00063 
00068    void _KShared_unref() const { if (!--count) delete this; }
00069 
00075    int _KShared_count() const { return count; }
00076 
00077 protected:
00078    virtual ~KShared() { }
00079 private:
00080    mutable int count;
00081 };
00082 
00099 template< class T >
00100 class KSharedPtr
00101 {
00102 public:
00106   KSharedPtr()
00107     : ptr(0) { }
00112   KSharedPtr( T* t )
00113     : ptr(t) { if ( ptr ) ptr->_KShared_ref(); }
00114 
00119   KSharedPtr( const KSharedPtr& p )
00120     : ptr(p.ptr) { if ( ptr ) ptr->_KShared_ref(); }
00121 
00126   ~KSharedPtr() { if ( ptr ) ptr->_KShared_unref(); }
00127 
00128   KSharedPtr<T>& operator= ( const KSharedPtr<T>& p ) {
00129     if ( ptr == p.ptr ) return *this;
00130     if ( ptr ) ptr->_KShared_unref();
00131     ptr = p.ptr;
00132     if ( ptr ) ptr->_KShared_ref();
00133     return *this;
00134   }
00135   KSharedPtr<T>& operator= ( T* p ) {
00136     if ( ptr == p ) return *this;
00137     if ( ptr ) ptr->_KShared_unref();
00138     ptr = p;
00139     if ( ptr ) ptr->_KShared_ref();
00140     return *this;
00141   }
00142   bool operator== ( const KSharedPtr<T>& p ) const { return ( ptr == p.ptr ); }
00143   bool operator!= ( const KSharedPtr<T>& p ) const { return ( ptr != p.ptr ); }
00144   bool operator== ( const T* p ) const { return ( ptr == p ); }
00145   bool operator!= ( const T* p ) const { return ( ptr != p ); }
00146   bool operator!() const { return ( ptr == 0 ); }
00147   operator T*() const { return ptr; }
00148 
00153   T* data() { return ptr; }
00154 
00159   const T* data() const { return ptr; }
00160 
00161   const T& operator*() const { return *ptr; }
00162   T& operator*() { return *ptr; }
00163   const T* operator->() const { return ptr; }
00164   T* operator->() { return ptr; }
00165 
00170   int count() const { return ptr->_KShared_count(); } // for debugging purposes
00171 private:
00172   T* ptr;
00173 };
00174 
00175 #endif
KDECore

ksharedptr.h

KDECore

API Reference
