llrefcount.h
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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) 2002-2010, 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
- {
- protected:
- LLRefCount(const LLRefCount& other);
- LLRefCount& operator=(const LLRefCount&);
- virtual ~LLRefCount(); // use unref()
-
- public:
- LLRefCount();
- void ref() const
- {
- mRef++;
- }
- S32 unref() const
- {
- llassert(mRef >= 1);
- if (0 == --mRef)
- {
- delete this;
- return 0;
- }
- return mRef;
- }
- //NOTE: when passing around a const LLRefCount object, this can return different results
- // at different types, since mRef is mutable
- S32 getNumRefs() const
- {
- return mRef;
- }
- private:
- mutable S32 mRef;
- };
- #endif