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// -*- c++ -*-
// Copyright 1998,1999 Zanshin Inc. <http://www.zanshin.com/>
// The contents of this file are subject to the Zanshin Public License Version
// 1.0 (the "License"); you may not use this file except in compliance with the
// License. You should have received a copy of the License with Latte; see
// the file COPYING. You may also obtain a copy of the License at
// <http://www.zanshin.com/ZPL.html>.
//
// 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 Latte.
//
// The Initial Developer of the Original Code is Zanshin, Inc.
#ifndef REFCOUNT_H
# define REFCOUNT_H
#ifndef CONFIGURE_IS_RUNNING
# include <latte-conf.h>
#endif // CONFIGURE_IS_RUNNING
#include <mutable.h>
template <class T>
class Refcounter {
public:
Refcounter() : val(0) {}
explicit Refcounter(T *v) : val(v) { if (val) val->inc_refcount(); }
Refcounter(const Refcounter<T> &other) : val(other.val) {
if (val)
val->inc_refcount();
}
~Refcounter() { if (val) val->dec_refcount(); }
Refcounter &operator = (const Refcounter<T> &other) {
if (this != &other) {
if (other.val)
other.val->inc_refcount();
if (val)
val->dec_refcount();
val = other.val;
}
return *this;
}
T *get() const { return val; }
T &operator * () const { return *val; }
T *operator -> () const { return val; }
private:
T *val;
};
class Refcounted {
public:
Refcounted() : refcount(0) {}
// The dtor is virtual because this may be mixed into virtual classes
virtual ~Refcounted() {}
void inc_refcount() const { ++(mutate(refcount)); }
void dec_refcount() const { if (!--(mutate(refcount))) delete this; }
private:
mutable unsigned long refcount;
};
#endif // REFCOUNT_H
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