JavaScriptCore-1097.3.tar.gz

[apple/javascriptcore.git] / wtf / VectorTraits.h

diff --git a/wtf/VectorTraits.h b/wtf/VectorTraits.h
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-/*
- * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public License
- * along with this library; see the file COPYING.LIB.  If not, write to
- * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- *
- */
-
-#ifndef WTF_VectorTraits_h
-#define WTF_VectorTraits_h
-
-#include "OwnPtr.h"
-#include "RefPtr.h"
-#include "TypeTraits.h"
-#include <utility>
-#include <memory>
-
-using std::pair;
-
-namespace WTF {
-
-    template<bool isPod, typename T>
-    struct VectorTraitsBase;
-
-    template<typename T>
-    struct VectorTraitsBase<false, T>
-    {
-        static const bool needsDestruction = true;
-        static const bool needsInitialization = true;
-        static const bool canInitializeWithMemset = false;
-        static const bool canMoveWithMemcpy = false;
-        static const bool canCopyWithMemcpy = false;
-        static const bool canFillWithMemset = false;
-        static const bool canCompareWithMemcmp = false;
-    };
-
-    template<typename T>
-    struct VectorTraitsBase<true, T>
-    {
-        static const bool needsDestruction = false;
-        static const bool needsInitialization = false;
-        static const bool canInitializeWithMemset = false;
-        static const bool canMoveWithMemcpy = true;
-        static const bool canCopyWithMemcpy = true;
-        static const bool canFillWithMemset = sizeof(T) == sizeof(char);
-        static const bool canCompareWithMemcmp = true;
-    };
-
-    template<typename T>
-    struct VectorTraits : VectorTraitsBase<IsPod<T>::value, T> { };
-
-    struct SimpleClassVectorTraits : VectorTraitsBase<false, void>
-    {
-        static const bool canInitializeWithMemset = true;
-        static const bool canMoveWithMemcpy = true;
-        static const bool canCompareWithMemcmp = true;
-    };
-
-    // we know OwnPtr and RefPtr are simple enough that initializing to 0 and moving with memcpy
-    // (and then not destructing the original) will totally work
-    template<typename P>
-    struct VectorTraits<RefPtr<P> > : SimpleClassVectorTraits { };
-
-    template<typename P>
-    struct VectorTraits<OwnPtr<P> > : SimpleClassVectorTraits { };
-
-    template<typename First, typename Second>
-    struct VectorTraits<pair<First, Second> >
-    {
-        typedef VectorTraits<First> FirstTraits;
-        typedef VectorTraits<Second> SecondTraits;
-
-        static const bool needsDestruction = FirstTraits::needsDestruction || SecondTraits::needsDestruction;
-        static const bool needsInitialization = FirstTraits::needsInitialization || SecondTraits::needsInitialization;
-        static const bool canInitializeWithMemset = FirstTraits::canInitializeWithMemset && SecondTraits::canInitializeWithMemset;
-        static const bool canMoveWithMemcpy = FirstTraits::canMoveWithMemcpy && SecondTraits::canMoveWithMemcpy;
-        static const bool canCopyWithMemcpy = FirstTraits::canCopyWithMemcpy && SecondTraits::canCopyWithMemcpy;
-        static const bool canFillWithMemset = false;
-        static const bool canCompareWithMemcmp = FirstTraits::canCompareWithMemcmp && SecondTraits::canCompareWithMemcmp;
-    };
-
-} // namespace WTF
-
-using WTF::VectorTraits;
-using WTF::SimpleClassVectorTraits;
-
-#endif // WTF_VectorTraits_h