/*
* Copyright (C) 2011 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef WTF_PassTraits_h
#define WTF_PassTraits_h
#include "wtf/OwnPtr.h"
#include "wtf/RefPtr.h"
// The PassTraits template exists to help optimize (or make possible) use
// of WTF data structures with WTF smart pointers that have a Pass
// variant for transfer of ownership
namespace WTF {
template<typename T> struct PassTraits {
typedef T Type;
typedef T PassType;
static Type& transfer(Type& value) { return value; }
};
template<typename T> struct PassTraits<OwnPtr<T> > {
typedef OwnPtr<T> Type;
typedef PassOwnPtr<T> PassType;
static PassType transfer(Type& value) { return value.release(); }
};
template<typename T> struct PassTraits<RefPtr<T> > {
typedef RefPtr<T> Type;
typedef PassRefPtr<T> PassType;
static PassType transfer(Type& value) { return value.release(); }
};
} // namespace WTF
using WTF::PassTraits;
#endif // WTF_PassTraits_h