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ReferenceHolder.h
/* -*- mode: c++; indent-tabs-mode: nil -*- */
/*
ReferenceHolder.h
Smart pointer like class that dereferences
obtained pointer to a QoreReferenceCounter in its destructor.
Qore Programming Language
Copyright (C) 2006 - 2013 Qore Technologies
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef QORE_REFERENCE_HOLDER_H_
#define QORE_REFERENCE_HOLDER_H_
#include <stdlib.h>
template<typename T = class AbstractQoreNode>
class ReferenceHolder {
private:
DLLLOCAL ReferenceHolder(const ReferenceHolder&); // not implemented
DLLLOCAL ReferenceHolder& operator=(const ReferenceHolder&); // not implemented
DLLLOCAL void* operator new(size_t); // not implemented, make sure it is not new'ed
T* p;
ExceptionSink* xsink;
public:
DLLLOCAL ReferenceHolder(ExceptionSink* xsink_) : p(0), xsink(xsink_) {}
DLLLOCAL ReferenceHolder(T* p_, ExceptionSink* xsink_) : p(p_), xsink(xsink_) {}
DLLLOCAL ~ReferenceHolder() { if (p) p->deref(xsink);}
DLLLOCAL T* operator->() { return p; }
DLLLOCAL T* operator*() { return p; }
DLLLOCAL void operator=(T *nv) {
if (p)
p->deref(xsink);
p = nv;
}
DLLLOCAL T* release() {
T *rv = p;
p = 0;
return rv;
}
DLLLOCAL operator bool() const { return p != 0; }
DLLLOCAL T** getPtrPtr() { return &p; }
DLLLOCAL T*& getRef() { return p; }
};
template<typename T>
class SimpleRefHolder {
private:
DLLLOCAL SimpleRefHolder(const SimpleRefHolder&); // not implemented
DLLLOCAL SimpleRefHolder& operator=(const SimpleRefHolder&); // not implemented
DLLLOCAL void* operator new(size_t); // not implemented, make sure it is not new'ed
T* p;
public:
DLLLOCAL SimpleRefHolder() : p(0) {}
DLLLOCAL SimpleRefHolder(T* p_) : p(p_) {}
DLLLOCAL ~SimpleRefHolder() { if (p) p->deref(); }
DLLLOCAL T* operator->() { return p; }
DLLLOCAL T* operator*() { return p; }
DLLLOCAL void operator=(T *nv) {
if (p)
p->deref();
p = nv;
}
DLLLOCAL T *release() {
T *rv = p;
p = 0;
return rv;
}
DLLLOCAL operator bool() const { return p != 0; }
};
#endif
// EOF