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 /*
  * This file is part of the KDE libraries
  * Copyright (C) 2006 Apple Computer, Inc.
  *
  * 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 <wtf/RefPtr.h>
 #include <utility>
 
 using std::pair;
 
 namespace WTF
 {
 
 template <typename T> struct IsPod           {
     static const bool value = false;
 };
 template <> struct IsPod<bool>               {
     static const bool value = true;
 };
 template <> struct IsPod<char>               {
     static const bool value = true;
 };
 template <> struct IsPod<signed char>        {
     static const bool value = true;
 };
 template <> struct IsPod<unsigned char>      {
     static const bool value = true;
 };
 template <> struct IsPod<short>              {
     static const bool value = true;
 };
 template <> struct IsPod<unsigned short>     {
     static const bool value = true;
 };
 template <> struct IsPod<int>                {
     static const bool value = true;
 };
 template <> struct IsPod<unsigned int>       {
     static const bool value = true;
 };
 template <> struct IsPod<long>               {
     static const bool value = true;
 };
 template <> struct IsPod<unsigned long>      {
     static const bool value = true;
 };
 template <> struct IsPod<long long>          {
     static const bool value = true;
 };
 template <> struct IsPod<unsigned long long> {
     static const bool value = true;
 };
 template <> struct IsPod<float>              {
     static const bool value = true;
 };
 template <> struct IsPod<double>             {
     static const bool value = true;
 };
 template <> struct IsPod<long double>        {
     static const bool value = true;
 };
 template <typename P> struct IsPod<P *>      {
     static const bool value = true;
 };
 
 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 RefPtr is 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 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