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 
00039 class KShared {
00040 public:
00045    KShared() : count(0) { }
00046 
00051    KShared( const KShared & ) : count(0) { }
00052 
00056    KShared &operator=(const KShared & ) { return *this; }
00057 
00061    void _KShared_ref() const { count++; }
00062 
00067    void _KShared_unref() const { if (!--count) delete this; }
00068 
00074    int _KShared_count() const { return count; }
00075 
00076 protected:
00077    virtual ~KShared() { }
00078 private:
00079    mutable int count;
00080 };
00081 
00095 template< class T >
00096 struct KSharedPtr
00097 {
00098 public:
00102   KSharedPtr()
00103     : ptr(0) { }
00108   KSharedPtr( T* t )
00109     : ptr(t) { if ( ptr ) ptr->_KShared_ref(); }
00110 
00115   KSharedPtr( const KSharedPtr& p )
00116     : ptr(p.ptr) { if ( ptr ) ptr->_KShared_ref(); }
00117 
00122   ~KSharedPtr() { if ( ptr ) ptr->_KShared_unref(); }
00123 
00124   KSharedPtr<T>& operator= ( const KSharedPtr<T>& p ) {
00125     if ( ptr == p.ptr ) return *this;
00126     if ( ptr ) ptr->_KShared_unref();
00127     ptr = p.ptr;
00128     if ( ptr ) ptr->_KShared_ref();
00129     return *this;
00130   }
00131   KSharedPtr<T>& operator= ( T* p ) {
00132     if ( ptr == p ) return *this;
00133     if ( ptr ) ptr->_KShared_unref();
00134     ptr = p;
00135     if ( ptr ) ptr->_KShared_ref();
00136     return *this;
00137   }
00138   bool operator== ( const KSharedPtr<T>& p ) const { return ( ptr == p.ptr ); }
00139   bool operator!= ( const KSharedPtr<T>& p ) const { return ( ptr != p.ptr ); }
00140   bool operator== ( const T* p ) const { return ( ptr == p ); }
00141   bool operator!= ( const T* p ) const { return ( ptr != p ); }
00142   bool operator!() const { return ( ptr == 0 ); }
00143   operator T*() const { return ptr; }
00144 
00149   T* data() { return ptr; }
00150 
00155   const T* data() const { return ptr; }
00156 
00157   const T& operator*() const { return *ptr; }
00158   T& operator*() { return *ptr; }
00159   const T* operator->() const { return ptr; }
00160   T* operator->() { return ptr; }
00161 
00166   int count() const { return ptr->_KShared_count(); } // for debugging purposes
00167 private:
00168   T* ptr;
00169 };
00170 
00171 #endif
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This file is part of the documentation for kdelibs Version 3.1.0.
Documentation copyright © 1996-2002 the KDE developers.
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