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/************************************************************************
*
* Copyright 2011 Jakob Leben (jakob.leben@gmail.com)
*
* This file is part of SuperCollider Qt GUI.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
************************************************************************/
#pragma once
#include "Common.h"
#include <QApplication>
#include <QAtomicPointer>
#include <QAtomicInt>
#include <QMutex>
namespace QtCollider {
template<typename T> class SafePtr
{
public:
SafePtr() : d(0) {}
SafePtr( const SafePtr & other )
: d ( other.d )
{
ref();
}
SafePtr( T* ptr )
: d ( new Data( ptr ) )
{}
SafePtr & operator= ( const SafePtr & other ) {
deref();
d = other.d;
ref();
return *this;
}
~SafePtr() {
deref();
}
T * operator-> () const { return d->ptr.load(); }
T & operator* () const { return *d->ptr.load(); }
operator T* () const { return (d ? d->ptr.load() : 0); }
T *ptr() const { return (d ? d->ptr.load() : 0); }
void *id() const { return (void*) d; } // useful for checking internal pointer identity
void invalidate() { qcDebugMsg(2,"SafePtr: invalidating"); if(d) d->ptr = 0; }
private:
struct Data {
Data ( T * ptr_ ) : ptr(ptr_), refCount(1) {}
QAtomicPointer<T> ptr;
QAtomicInt refCount;
};
void ref() {
if( d ) {
d->refCount.ref();
qcDebugMsg(2,QString("SafePtr: +refcount = %1").arg(d->refCount.load()));
}
}
void deref() {
if( d ) {
bool ref = d->refCount.deref();
qcDebugMsg(2,QString("SafePtr: -refcount = %1").arg(d->refCount.load()));
if( !ref ) {
qcDebugMsg(2,"SafePtr: unreferenced!");
delete d;
}
}
}
Data *d;
};
} // namespace QtCollider
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