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/*
* psharedptr.h
*
* SharedPtr template
*
* Portable Windows Library
*
* Copyright (C) 2004 Post Increment
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.0 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* The Original Code is Portable Windows Library.
*
* The Initial Developer of the Original Code is Post Increment
*
* Contributor(s): ______________________________________.
*
* $Log: psharedptr.h,v $
* Revision 1.3 2004/10/21 09:20:33 csoutheren
* Fixed compile problems on gcc 2.95.x
*
* Revision 1.2 2004/10/01 08:08:50 csoutheren
* Added Reset and auto_ptr conversions
*
* Revision 1.1 2004/10/01 07:17:18 csoutheren
* Added PSharedptr class
*
*/
#ifndef _PSHAREDPTR_H
#define _PSHAREDPTR_H
#ifdef P_USE_PRAGMA
#pragma interface
#endif
#include <ptlib.h>
#include <memory>
/**
*
* These templates implement an pointner class with an integral reference count
* based on the PContainer base class. This allows the easy creation of an
* a reference counted ptr that will autodestruct when the last reference
* goes out of scope.
*/
template <class T>
class PSharedPtr : public PContainer
{
PCLASSINFO(PSharedPtr, PContainer);
public:
typedef T element_type;
PSharedPtr(element_type * _ptr = NULL)
{ ptr = _ptr; }
PSharedPtr(const PSharedPtr & c)
: PContainer(c)
{ CopyContents(c); }
PSharedPtr(std::auto_ptr<element_type> & v)
{ ptr = v.release(); }
PSharedPtr & operator=(const PSharedPtr & c)
{ AssignContents(c); return *this; }
virtual ~PSharedPtr()
{ Destruct(); }
virtual BOOL MakeUnique()
{ if (PContainer::MakeUnique()) return TRUE; CloneContents(this); return FALSE; }
BOOL SetSize(PINDEX)
{ return false; }
T * Get() const
{ return ptr; }
void Reset() const
{ AssignContents(PSharedPtr()); }
T & operator*() const
{ return *ptr; }
T * operator->() const
{ return ptr; }
protected:
PSharedPtr(int dummy, const PSharedPtr * c)
: PContainer(dummy, c)
{ CloneContents(c); }
void AssignContents(const PContainer & c)
{ PContainer::AssignContents(c); CopyContents((const PSharedPtr &)c); }
void DestroyContents()
{ delete(ptr); }
void CloneContents(const PContainer * src)
{ ptr = new element_type(*((const PSharedPtr *)src)->ptr); }
void CopyContents(const PContainer & c)
{ ptr = ((const PSharedPtr &)c).ptr; }
protected:
T * ptr;
};
#endif // _PSHAREDPTR_H
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