ksharedptr.h

/* This file is part of the KDE libraries
   Copyright (c) 1999 Waldo Bastian <bastian@kde.org>
 
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License version 2 as published by the Free Software Foundation.
 
   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.
 
   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.
*/
#ifndef TDESharedPTR_H
#define TDESharedPTR_H
 
#include "tdelibs_export.h"
 
class TDECORE_EXPORT TDEShared {
public:
   TDEShared() : count(0) { }
 
   TDEShared( const TDEShared & ) : count(0) { }
 
   TDEShared &operator=(const TDEShared & ) { return *this; }
 
   void _TDEShared_ref() const { count++; }
 
   void _TDEShared_unref() const { if (!--count) delete this; }
 
   int _TDEShared_count() const { return count; }
 
protected:
   virtual ~TDEShared() { }
private:
   mutable int count;
};
 
template< class T >
class TDESharedPtr
{
public:
  TDESharedPtr()
    : ptr(0) { }
  TDESharedPtr( T* t )
    : ptr(t) { if ( ptr ) ptr->_TDEShared_ref(); }
 
  TDESharedPtr( const TDESharedPtr& p )
    : ptr(p.ptr) { if ( ptr ) ptr->_TDEShared_ref(); }
 
  ~TDESharedPtr() { if ( ptr ) ptr->_TDEShared_unref(); }
 
  TDESharedPtr<T>& operator= ( const TDESharedPtr<T>& p ) {
    if ( ptr == p.ptr ) return *this;
    if ( ptr ) ptr->_TDEShared_unref();
    ptr = p.ptr;
    if ( ptr ) ptr->_TDEShared_ref();
    return *this;
  }
  TDESharedPtr<T>& operator= ( T* p ) {
    if ( ptr == p ) return *this;
    if ( ptr ) ptr->_TDEShared_unref();
    ptr = p;
    if ( ptr ) ptr->_TDEShared_ref();
    return *this;
  }
  bool operator== ( const TDESharedPtr<T>& p ) const { return ( ptr == p.ptr ); }
  bool operator!= ( const TDESharedPtr<T>& p ) const { return ( ptr != p.ptr ); }
  bool operator== ( const T* p ) const { return ( ptr == p ); }
  bool operator!= ( const T* p ) const { return ( ptr != p ); }
  bool operator!() const { return ( ptr == 0 ); }
  operator T*() const { return ptr; }
 
  T* data() { return ptr; }
 
  const T* data() const { return ptr; }
 
  const T& operator*() const { return *ptr; }
  T& operator*() { return *ptr; }
  const T* operator->() const { return ptr; }
  T* operator->() { return ptr; }
 
  int count() const { return ptr->_TDEShared_count(); } // for debugging purposes
private:
  T* ptr;
};
 
#endif