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 kdecore Library Version 3.2.3.
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