1 /* 2 * Copyright (C) 2011 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of 14 * its contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #ifndef WTF_PassTraits_h 30 #define WTF_PassTraits_h 31 32 #include "wtf/OwnPtr.h" 33 #include "wtf/RefPtr.h" 34 35 // The PassTraits template exists to help optimize (or make possible) use 36 // of WTF data structures with WTF smart pointers that have a Pass 37 // variant for transfer of ownership 38 39 namespace WTF { 40 41 template<typename T> struct PassTraits { 42 typedef T Type; 43 typedef T PassType; 44 static Type& transfer(Type& value) { return value; } 45 }; 46 47 template<typename T> struct PassTraits<OwnPtr<T> > { 48 typedef OwnPtr<T> Type; 49 typedef PassOwnPtr<T> PassType; 50 static PassType transfer(Type& value) { return value.release(); } 51 }; 52 53 template<typename T> struct PassTraits<RefPtr<T> > { 54 typedef RefPtr<T> Type; 55 typedef PassRefPtr<T> PassType; 56 static PassType transfer(Type& value) { return value.release(); } 57 }; 58 59 } // namespace WTF 60 61 using WTF::PassTraits; 62 63 #endif // WTF_PassTraits_h 64
