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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
    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

This file is part of the documentation for kdecore Library Version 3.4.1.
Documentation copyright © 1996-2004 the KDE developers.
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