94 lines
3.1 KiB
C++
94 lines
3.1 KiB
C++
/**
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* @file llptrto.h
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* @author Nat Goodspeed
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* @date 2008-08-19
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* @brief LLPtrTo<TARGET> is a template helper to pick either TARGET* or -- when
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* TARGET is a subclass of LLRefCount or LLThreadSafeRefCount --
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* LLPointer<TARGET>. LLPtrTo<> chooses whichever pointer type is best.
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*
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* $LicenseInfo:firstyear=2008&license=viewergpl$
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*
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* Copyright (c) 2008-2009, Linden Research, Inc.
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*
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* Second Life Viewer Source Code
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* The source code in this file ("Source Code") is provided by Linden Lab
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* to you under the terms of the GNU General Public License, version 2.0
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* ("GPL"), unless you have obtained a separate licensing agreement
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* ("Other License"), formally executed by you and Linden Lab. Terms of
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* the GPL can be found in doc/GPL-license.txt in this distribution, or
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* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
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*
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* There are special exceptions to the terms and conditions of the GPL as
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* it is applied to this Source Code. View the full text of the exception
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* in the file doc/FLOSS-exception.txt in this software distribution, or
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* online at
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* http://secondlifegrid.net/programs/open_source/licensing/flossexception
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*
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* By copying, modifying or distributing this software, you acknowledge
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* that you have read and understood your obligations described above,
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* and agree to abide by those obligations.
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*
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* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
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* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
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* COMPLETENESS OR PERFORMANCE.
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* $/LicenseInfo$
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*/
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#if ! defined(LL_LLPTRTO_H)
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#define LL_LLPTRTO_H
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#include "llpointer.h"
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#include "llrefcount.h" // LLRefCount
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#include "llthread.h" // LLThreadSafeRefCount
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#include <boost/type_traits/is_base_of.hpp>
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#include <boost/type_traits/remove_pointer.hpp>
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#include <boost/utility/enable_if.hpp>
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/**
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* LLPtrTo<TARGET>::type is either of two things:
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*
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* * When TARGET is a subclass of either LLRefCount or LLThreadSafeRefCount,
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* LLPtrTo<TARGET>::type is LLPointer<TARGET>.
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* * Otherwise, LLPtrTo<TARGET>::type is TARGET*.
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*
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* This way, a class template can use LLPtrTo<TARGET>::type to select an
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* appropriate pointer type to store.
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*/
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template <class T, class ENABLE=void>
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struct LLPtrTo
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{
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typedef T* type;
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};
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/// specialize for subclasses of LLRefCount
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template <class T>
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struct LLPtrTo<T, typename boost::enable_if< boost::is_base_of<LLRefCount, T> >::type>
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{
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typedef LLPointer<T> type;
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};
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/// specialize for subclasses of LLThreadSafeRefCount
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template <class T>
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struct LLPtrTo<T, typename boost::enable_if< boost::is_base_of<LLThreadSafeRefCount, T> >::type>
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{
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typedef LLPointer<T> type;
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};
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/**
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* LLRemovePointer<PTRTYPE>::type gets you the underlying (pointee) type.
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*/
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template <typename PTRTYPE>
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struct LLRemovePointer
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{
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typedef typename boost::remove_pointer<PTRTYPE>::type type;
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};
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/// specialize for LLPointer<SOMECLASS>
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template <typename SOMECLASS>
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struct LLRemovePointer< LLPointer<SOMECLASS> >
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{
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typedef SOMECLASS type;
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};
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#endif /* ! defined(LL_LLPTRTO_H) */
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