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// refcounted_base.h -*-c++-*-
//
// Copyright (C) 2008-2009 Daniel Burrows
//
// 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; see the file COPYING. If not, write to
// the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.
#ifndef REFCOUNTED_BASE_H
#define REFCOUNTED_BASE_H
#include <sigc++/trackable.h>
#include <cwidget/generic/threads/threads.h>
namespace aptitude
{
namespace util
{
/** \brief A class meant to be wrapped in cwidget::ref_ptr objects. */
class refcounted_base_not_threadsafe : public sigc::trackable
{
mutable int refcount;
public:
/** \brief Create an object with a reference count of 0. */
refcounted_base_not_threadsafe() : refcount(0) { }
virtual ~refcounted_base_not_threadsafe();
/** \brief Increment the reference count (normally ref_ptr will do this). */
void incref() { ++refcount; }
/** \brief Decrement the reference count (normally ref_ptr will do this). */
void decref()
{
--refcount;
if(refcount == 0)
delete this;
}
};
/** \brief A class meant to be wrapped in cwidget::ref_ptr objects.
*
* This variant is threadsafe, which means it's quite a bit more
* expensive to copy around.
*/
class refcounted_base_threadsafe : public sigc::trackable
{
mutable int refcount;
cwidget::threads::mutex m;
public:
/** \brief Create an object with a reference count of 0. */
refcounted_base_threadsafe() : refcount(0) { }
virtual ~refcounted_base_threadsafe();
/** \brief Increment the reference count (normally ref_ptr will do this). */
void incref()
{
cwidget::threads::mutex::lock l(m);
++refcount;
}
/** \brief Decrement the reference count (normally ref_ptr will do this). */
void decref()
{
int new_refcount;
{
cwidget::threads::mutex::lock l(m);
--refcount;
new_refcount = refcount;
}
if(new_refcount == 0)
delete this;
}
};
}
}
#endif
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