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/**
* @file llrefcount.h
* @brief Base class for reference counted objects for use with LLPointer
*
* $LicenseInfo:firstyear=2002&license=viewergpl$
*
* Copyright (c) 2002-2009, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at
* http://secondlifegrid.net/programs/open_source/licensing/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#ifndef LLREFCOUNT_H
#define LLREFCOUNT_H
#include <boost/noncopyable.hpp>
//----------------------------------------------------------------------------
// RefCount objects should generally only be accessed by way of LLPointer<>'s
// see llthread.h for LLThreadSafeRefCount
//----------------------------------------------------------------------------
class LL_COMMON_API LLRefCount
{
private:
LLRefCount(const LLRefCount& other); // no implementation
private:
LLRefCount& operator=(const LLRefCount&); // no implementation
protected:
virtual ~LLRefCount(); // use unref()
public:
LLRefCount();
void ref()
{
mRef++;
}
S32 unref()
{
llassert(mRef >= 1);
if (0 == --mRef)
{
delete this;
return 0;
}
return mRef;
}
S32 getNumRefs() const
{
return mRef;
}
private:
S32 mRef;
};
#endif
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