/* | |
* 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 | |
{ | |
static const bool needsDestruction = true; | |
static const bool needsInitialization = true; | |
static const bool canInitializeWithMemset = true; | |
static const bool canMoveWithMemcpy = true; | |
static const bool canCopyWithMemcpy = false; | |
static const bool canFillWithMemset = false; | |
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 P> | |
struct VectorTraits<std::auto_ptr<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 |