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122 lines
4.8 KiB
C++
122 lines
4.8 KiB
C++
/*
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* Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef SKY_ENGINE_WTF_VECTORTRAITS_H_
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#define SKY_ENGINE_WTF_VECTORTRAITS_H_
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#include <utility>
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#include "flutter/sky/engine/wtf/OwnPtr.h"
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#include "flutter/sky/engine/wtf/RefPtr.h"
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#include "flutter/sky/engine/wtf/TypeTraits.h"
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using std::pair;
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namespace WTF {
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class AtomicString;
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template <typename T>
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struct VectorTraitsBase {
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static const bool needsDestruction = !IsPod<T>::value;
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static const bool canInitializeWithMemset = IsPod<T>::value;
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static const bool canMoveWithMemcpy = IsPod<T>::value;
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static const bool canCopyWithMemcpy = IsPod<T>::value;
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static const bool canFillWithMemset =
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IsPod<T>::value && (sizeof(T) == sizeof(char));
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static const bool canCompareWithMemcmp = IsPod<T>::value;
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static const WeakHandlingFlag weakHandlingFlag =
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NoWeakHandlingInCollections; // We don't support weak handling in
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// vectors.
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};
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template <typename T>
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struct VectorTraits : VectorTraitsBase<T> {};
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// Classes marked with SimpleVectorTraits will use memmov, memcpy, memcmp
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// instead of constructors, copy operators, etc for initialization, move
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// and comparison.
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template <typename T>
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struct SimpleClassVectorTraits : VectorTraitsBase<T> {
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static const bool canInitializeWithMemset = true;
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static const bool canMoveWithMemcpy = true;
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static const bool canCompareWithMemcmp = true;
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};
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// We know OwnPtr and RefPtr are simple enough that initializing to 0 and
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// moving with memcpy (and then not destructing the original) will totally
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// work.
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template <typename P>
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struct VectorTraits<RefPtr<P>> : SimpleClassVectorTraits<RefPtr<P>> {};
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template <typename P>
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struct VectorTraits<OwnPtr<P>> : SimpleClassVectorTraits<OwnPtr<P>> {};
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template <typename First, typename Second>
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struct VectorTraits<pair<First, Second>> {
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typedef VectorTraits<First> FirstTraits;
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typedef VectorTraits<Second> SecondTraits;
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static const bool needsDestruction =
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FirstTraits::needsDestruction || SecondTraits::needsDestruction;
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static const bool canInitializeWithMemset =
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FirstTraits::canInitializeWithMemset &&
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SecondTraits::canInitializeWithMemset;
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static const bool canMoveWithMemcpy =
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FirstTraits::canMoveWithMemcpy && SecondTraits::canMoveWithMemcpy;
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static const bool canCopyWithMemcpy =
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FirstTraits::canCopyWithMemcpy && SecondTraits::canCopyWithMemcpy;
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static const bool canFillWithMemset = false;
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static const bool canCompareWithMemcmp =
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FirstTraits::canCompareWithMemcmp && SecondTraits::canCompareWithMemcmp;
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static const WeakHandlingFlag weakHandlingFlag =
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NoWeakHandlingInCollections; // We don't support weak handling in
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// vectors.
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};
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} // namespace WTF
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#define WTF_ALLOW_MOVE_INIT_AND_COMPARE_WITH_MEM_FUNCTIONS(ClassName) \
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namespace WTF { \
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template <> \
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struct VectorTraits<ClassName> : SimpleClassVectorTraits<ClassName> {}; \
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}
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#define WTF_ALLOW_MOVE_AND_INIT_WITH_MEM_FUNCTIONS(ClassName) \
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namespace WTF { \
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template <> \
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struct VectorTraits<ClassName> : VectorTraitsBase<ClassName> { \
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static const bool canInitializeWithMemset = true; \
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static const bool canMoveWithMemcpy = true; \
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}; \
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}
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#define WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(ClassName) \
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namespace WTF { \
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template <> \
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struct VectorTraits<ClassName> : VectorTraitsBase<ClassName> { \
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static const bool canInitializeWithMemset = true; \
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}; \
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}
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using WTF::SimpleClassVectorTraits;
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using WTF::VectorTraits;
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#endif // SKY_ENGINE_WTF_VECTORTRAITS_H_
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