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// -*- Mode: C++; -*-
/*
This file is part of the Opie Project
Copyright (C) 2004 Rajko Albrecht <alwin@handhelds.org>
Copyright (C) 2004 Holger Hans Peter Freyther <freyther@handhelds.org>
Copyright (C) The Opie Team <opie-devel@handhelds.org>
=.
.=l.
.>+-=
_;:, .> :=|. This program is free software; you can
.> <`_, > . <= redistribute it and/or modify it under
:`=1 )Y*s>-.-- : the terms of the GNU Library General Public
.="- .-=="i, .._ License as published by the Free Software
- . .-<_> .<> Foundation; either version 2 of the License,
._= =} : or (at your option) any later version.
.%`+i> _;_.
.i_,=:_. -<s. This program 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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#ifndef O_SHARED_POINTER_H
#define O_SHARED_POINTER_H
#include <opie2/osmartpointer.h>
/*!
* \file osharedpointer.h
* \brief Adapter with Refcounting around any data type
* \author Rajko Albrecht and Holger Hans Peter Freyther
*/
namespace Opie {
namespace Core {
template<class T>
class OSharedPointerData : public ORefCount {
public:
OSharedPointerData( T* dt ) {
data = dt;
}
~OSharedPointerData() {
delete data;
}
T *data;
};
/**
* \brief A small Adapter around any Pointer
*
*
*
*/
template<class T>
class OSharedPointer {
typedef OSharedPointerData<T> Data;
Data* data;
void unref() {
if (data) { data->Decr(); if (!data->Shared()) delete data; }
data = 0;
}
public:
OSharedPointer () { data = 0;}
OSharedPointer( T* t ) {
data = new Data( t );
data->Incr();
}
OSharedPointer( const OSharedPointer<T>& p ) {
if ( data = p.data ) data->Incr();
}
~OSharedPointer() {
unref();
}
OSharedPointer<T> &operator=( const OSharedPointer<T>& p ) {
// already same: nothing to do
if (data == p.data) return *this;
// decouple reference
unref();
// establish new reference
if (data = p.data) data->Incr();
return *this;
}
OSharedPointer<T> &operator=( T *p ) {
unref();
data = new Data( p );
data->Incr();
return *this;
}
operator T* () const { return data->data; }
T& operator*() { return *data->data; }
const T& operator*()const { return data->data; }
//! deref with method call
T* operator-> () {return data->data; }
//! deref with const method call
const T* operator-> ()const {return data->data; }
//! supports "if (pointer)"
operator bool () const { return (data != 0 && data->data != 0); }
//! "if (pointer)" as non const
operator bool () { return ( data != 0 && data->data != NULL );}
//! support if (!pointer)"
bool operator! () const { return (data == 0 || data->data == 0); }
//! support if (!pointer)" as non const
bool operator! () { return (data == 0 || data->data == 0); }
};
}
}
#endif
|
