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# 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

This file is part of the documentation for kdelibs Version 3.1.5.
Documentation copyright © 1996-2002 the KDE developers.
Generated on Wed Jan 28 12:46:50 2004 by doxygen 1.3.4 written by Dimitri van Heesch, © 1997-2001