#ifndef WTF_VectorTraits_h
#define WTF_VectorTraits_h
#include <wtf/OwnPtr.h>
#include <wtf/Ref.h>
#include <wtf/RefPtr.h>
#include <utility>
#include <memory>
namespace WTF {
class AtomicString;
template<bool isPod, typename T>
struct VectorTraitsBase;
template<typename T>
struct VectorTraitsBase<false, T>
{
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 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<std::is_pod<T>::value, T> { };
struct SimpleClassVectorTraits : VectorTraitsBase<false, void>
{
static const bool canInitializeWithMemset = true;
static const bool canMoveWithMemcpy = true;
static const bool canCompareWithMemcmp = true;
};
template<typename P>
struct VectorTraits<RefPtr<P>> : SimpleClassVectorTraits { };
template<typename P>
struct VectorTraits<OwnPtr<P>> : SimpleClassVectorTraits { };
template<typename P>
struct VectorTraits<std::unique_ptr<P>> : SimpleClassVectorTraits { };
template<typename P>
struct VectorTraits<Ref<P>> : SimpleClassVectorTraits { };
template<>
struct VectorTraits<AtomicString> : SimpleClassVectorTraits { };
template<typename First, typename Second>
struct VectorTraits<std::pair<First, Second>>
{
typedef VectorTraits<First> FirstTraits;
typedef VectorTraits<Second> SecondTraits;
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;
};
}
using WTF::VectorTraits;
using WTF::SimpleClassVectorTraits;
#endif // WTF_VectorTraits_h