sky/engine/wtf/HashMap.h - external/github.com/flutter/engine - Git at Google

 /*
  * Copyright (C) 2005, 2006, 2007, 2008, 2011 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 SKY_ENGINE_WTF_HASHMAP_H_
 #define SKY_ENGINE_WTF_HASHMAP_H_

 #include "sky/engine/wtf/DefaultAllocator.h"
 #include "sky/engine/wtf/HashTable.h"

 namespace WTF {

     template<typename KeyTraits, typename MappedTraits> struct HashMapValueTraits;

     template<typename T> struct ReferenceTypeMaker {
         typedef T& ReferenceType;
     };
     template<typename T> struct ReferenceTypeMaker<T&> {
         typedef T& ReferenceType;
     };

     struct KeyValuePairKeyExtractor {
         template<typename T>
         static const typename T::KeyType& extract(const T& p) { return p.key; }
     };

     // Note: empty or deleted key values are not allowed, using them may lead to undefined behavior.
     // For pointer keys this means that null pointers are not allowed unless you supply custom key traits.
     template<
         typename KeyArg,
         typename MappedArg,
         typename HashArg = typename DefaultHash<KeyArg>::Hash,
         typename KeyTraitsArg = HashTraits<KeyArg>,
         typename MappedTraitsArg = HashTraits<MappedArg>,
         typename Allocator = DefaultAllocator>
     class HashMap {
         WTF_USE_ALLOCATOR(HashMap, Allocator);
     private:
         typedef KeyTraitsArg KeyTraits;
         typedef MappedTraitsArg MappedTraits;
         typedef HashMapValueTraits<KeyTraits, MappedTraits> ValueTraits;

     public:
         typedef typename KeyTraits::TraitType KeyType;
         typedef typename KeyTraits::PassInType KeyPassInType;
         typedef const typename KeyTraits::PeekInType& KeyPeekInType;
         typedef typename MappedTraits::TraitType MappedType;
         typedef typename ValueTraits::TraitType ValueType;

     private:
         typedef typename MappedTraits::PassInType MappedPassInType;
         typedef typename MappedTraits::PassOutType MappedPassOutType;
         typedef typename MappedTraits::PeekOutType MappedPeekType;

         typedef typename ReferenceTypeMaker<MappedPassInType>::ReferenceType MappedPassInReferenceType;

         typedef HashArg HashFunctions;

         typedef HashTable<KeyType, ValueType, KeyValuePairKeyExtractor,
             HashFunctions, ValueTraits, KeyTraits, Allocator> HashTableType;

         class HashMapKeysProxy;
         class HashMapValuesProxy;

     public:
         typedef HashTableIteratorAdapter<HashTableType, ValueType> iterator;
         typedef HashTableConstIteratorAdapter<HashTableType, ValueType> const_iterator;
         typedef typename HashTableType::AddResult AddResult;

     public:
         void swap(HashMap& ref)
         {
             m_impl.swap(ref.m_impl);
         }

         void swap(typename Allocator::template OtherType<HashMap>::Type other)
         {
             HashMap& ref = Allocator::getOther(other);
             m_impl.swap(ref.m_impl);
         }

         unsigned size() const;
         unsigned capacity() const;
         bool isEmpty() const;

         // iterators iterate over pairs of keys and values
         iterator begin();
         iterator end();
         const_iterator begin() const;
         const_iterator end() const;

         HashMapKeysProxy& keys() { return static_cast<HashMapKeysProxy&>(*this); }
         const HashMapKeysProxy& keys() const { return static_cast<const HashMapKeysProxy&>(*this); }

         HashMapValuesProxy& values() { return static_cast<HashMapValuesProxy&>(*this); }
         const HashMapValuesProxy& values() const { return static_cast<const HashMapValuesProxy&>(*this); }

         iterator find(KeyPeekInType);
         const_iterator find(KeyPeekInType) const;
         bool contains(KeyPeekInType) const;
         MappedPeekType get(KeyPeekInType) const;

         // replaces value but not key if key is already present
         // return value is a pair of the iterator to the key location,
         // and a boolean that's true if a new value was actually added
         AddResult set(KeyPassInType, MappedPassInType);

         // does nothing if key is already present
         // return value is a pair of the iterator to the key location,
         // and a boolean that's true if a new value was actually added
         AddResult add(KeyPassInType, MappedPassInType);

         void remove(KeyPeekInType);
         void remove(iterator);
         void clear();
         template<typename Collection>
         void removeAll(const Collection& toBeRemoved) { WTF::removeAll(*this, toBeRemoved); }

         MappedPassOutType take(KeyPeekInType); // efficient combination of get with remove

         // An alternate version of find() that finds the object by hashing and comparing
         // with some other type, to avoid the cost of type conversion. HashTranslator
         // must have the following function members:
         //   static unsigned hash(const T&);
         //   static bool equal(const ValueType&, const T&);
         template<typename HashTranslator, typename T> iterator find(const T&);
         template<typename HashTranslator, typename T> const_iterator find(const T&) const;
         template<typename HashTranslator, typename T> bool contains(const T&) const;

         // An alternate version of add() that finds the object by hashing and comparing
         // with some other type, to avoid the cost of type conversion if the object is already
         // in the table. HashTranslator must have the following function members:
         //   static unsigned hash(const T&);
         //   static bool equal(const ValueType&, const T&);
         //   static translate(ValueType&, const T&, unsigned hashCode);
         template<typename HashTranslator, typename T> AddResult add(const T&, MappedPassInType);

         static bool isValidKey(KeyPeekInType);

     private:
         AddResult inlineAdd(KeyPassInType, MappedPassInReferenceType);

         HashTableType m_impl;
     };

     template<typename KeyArg, typename MappedArg, typename HashArg, typename KeyTraitsArg, typename MappedTraitsArg, typename Allocator>
     class HashMap<KeyArg, MappedArg, HashArg, KeyTraitsArg, MappedTraitsArg, Allocator>::HashMapKeysProxy :
         private HashMap<KeyArg, MappedArg, HashArg, KeyTraitsArg, MappedTraitsArg, Allocator> {
         public:
             typedef HashMap<KeyArg, MappedArg, HashArg, KeyTraitsArg, MappedTraitsArg, Allocator> HashMapType;
             typedef typename HashMapType::iterator::Keys iterator;
             typedef typename HashMapType::const_iterator::Keys const_iterator;

             iterator begin()
             {
                 return HashMapType::begin().keys();
             }

             iterator end()
             {
                 return HashMapType::end().keys();
             }

             const_iterator begin() const
             {
                 return HashMapType::begin().keys();
             }

             const_iterator end() const
             {
                 return HashMapType::end().keys();
             }

         private:
             friend class HashMap;

             // These are intentionally not implemented.
             HashMapKeysProxy();
             HashMapKeysProxy(const HashMapKeysProxy&);
             HashMapKeysProxy& operator=(const HashMapKeysProxy&);
             ~HashMapKeysProxy();
     };

     template<typename KeyArg, typename MappedArg, typename HashArg,  typename KeyTraitsArg, typename MappedTraitsArg, typename Allocator>
     class HashMap<KeyArg, MappedArg, HashArg, KeyTraitsArg, MappedTraitsArg, Allocator>::HashMapValuesProxy :
         private HashMap<KeyArg, MappedArg, HashArg, KeyTraitsArg, MappedTraitsArg, Allocator> {
         public:
             typedef HashMap<KeyArg, MappedArg, HashArg, KeyTraitsArg, MappedTraitsArg, Allocator> HashMapType;
             typedef typename HashMapType::iterator::Values iterator;
             typedef typename HashMapType::const_iterator::Values const_iterator;

             iterator begin()
             {
                 return HashMapType::begin().values();
             }

             iterator end()
             {
                 return HashMapType::end().values();
             }

             const_iterator begin() const
             {
                 return HashMapType::begin().values();
             }

             const_iterator end() const
             {
                 return HashMapType::end().values();
             }

         private:
             friend class HashMap;

             // These are intentionally not implemented.
             HashMapValuesProxy();
             HashMapValuesProxy(const HashMapValuesProxy&);
             HashMapValuesProxy& operator=(const HashMapValuesProxy&);
             ~HashMapValuesProxy();
     };

     template<typename KeyTraits, typename MappedTraits> struct HashMapValueTraits : KeyValuePairHashTraits<KeyTraits, MappedTraits> {
         static const bool hasIsEmptyValueFunction = true;
         static bool isEmptyValue(const typename KeyValuePairHashTraits<KeyTraits, MappedTraits>::TraitType& value)
         {
             return isHashTraitsEmptyValue<KeyTraits>(value.key);
         }
     };

     template<typename ValueTraits, typename HashFunctions>
     struct HashMapTranslator {
         template<typename T> static unsigned hash(const T& key) { return HashFunctions::hash(key); }
         template<typename T, typename U> static bool equal(const T& a, const U& b) { return HashFunctions::equal(a, b); }
         template<typename T, typename U, typename V> static void translate(T& location, const U& key, const V& mapped)
         {
             location.key = key;
             ValueTraits::ValueTraits::store(mapped, location.value);
         }
     };

     template<typename ValueTraits, typename Translator>
     struct HashMapTranslatorAdapter {
         template<typename T> static unsigned hash(const T& key) { return Translator::hash(key); }
         template<typename T, typename U> static bool equal(const T& a, const U& b) { return Translator::equal(a, b); }
         template<typename T, typename U, typename V> static void translate(T& location, const U& key, const V& mapped, unsigned hashCode)
         {
             Translator::translate(location.key, key, hashCode);
             ValueTraits::ValueTraits::store(mapped, location.value);
         }
     };

     template<typename T, typename U, typename V, typename W, typename X, typename Y>
     inline unsigned HashMap<T, U, V, W, X, Y>::size() const
     {
         return m_impl.size();
     }

     template<typename T, typename U, typename V, typename W, typename X, typename Y>
     inline unsigned HashMap<T, U, V, W, X, Y>::capacity() const
     {
         return m_impl.capacity();
     }

     template<typename T, typename U, typename V, typename W, typename X, typename Y>
     inline bool HashMap<T, U, V, W, X, Y>::isEmpty() const
     {
         return m_impl.isEmpty();
     }

     template<typename T, typename U, typename V, typename W, typename X, typename Y>
     inline typename HashMap<T, U, V, W, X, Y>::iterator HashMap<T, U, V, W, X, Y>::begin()
     {
         return m_impl.begin();
     }

     template<typename T, typename U, typename V, typename W, typename X, typename Y>
     inline typename HashMap<T, U, V, W, X, Y>::iterator HashMap<T, U, V, W, X, Y>::end()
     {
         return m_impl.end();
     }

     template<typename T, typename U, typename V, typename W, typename X, typename Y>
     inline typename HashMap<T, U, V, W, X, Y>::const_iterator HashMap<T, U, V, W, X, Y>::begin() const
     {
         return m_impl.begin();
     }

     template<typename T, typename U, typename V, typename W, typename X, typename Y>
     inline typename HashMap<T, U, V, W, X, Y>::const_iterator HashMap<T, U, V, W, X, Y>::end() const
     {
         return m_impl.end();
     }

     template<typename T, typename U, typename V, typename W, typename X, typename Y>
     inline typename HashMap<T, U, V, W, X, Y>::iterator HashMap<T, U, V, W, X, Y>::find(KeyPeekInType key)
     {
         return m_impl.find(key);
     }

     template<typename T, typename U, typename V, typename W, typename X, typename Y>
     inline typename HashMap<T, U, V, W, X, Y>::const_iterator HashMap<T, U, V, W, X, Y>::find(KeyPeekInType key) const
     {
         return m_impl.find(key);
     }

     template<typename T, typename U, typename V, typename W, typename X, typename Y>
     inline bool HashMap<T, U, V, W, X, Y>::contains(KeyPeekInType key) const
     {
         return m_impl.contains(key);
     }

     template<typename T, typename U, typename V, typename W, typename X, typename Y>
     template<typename HashTranslator, typename TYPE>
     inline typename HashMap<T, U, V, W, X, Y>::iterator
     HashMap<T, U, V, W, X, Y>::find(const TYPE& value)
     {
         return m_impl.template find<HashMapTranslatorAdapter<ValueTraits, HashTranslator> >(value);
     }

     template<typename T, typename U, typename V, typename W, typename X, typename Y>
     template<typename HashTranslator, typename TYPE>
     inline typename HashMap<T, U, V, W, X, Y>::const_iterator
     HashMap<T, U, V, W, X, Y>::find(const TYPE& value) const
     {
         return m_impl.template find<HashMapTranslatorAdapter<ValueTraits, HashTranslator> >(value);
     }

     template<typename T, typename U, typename V, typename W, typename X, typename Y>
     template<typename HashTranslator, typename TYPE>
     inline bool
     HashMap<T, U, V, W, X, Y>::contains(const TYPE& value) const
     {
         return m_impl.template contains<HashMapTranslatorAdapter<ValueTraits, HashTranslator> >(value);
     }

     template<typename T, typename U, typename V, typename W, typename X, typename Y>
     typename HashMap<T, U, V, W, X, Y>::AddResult
     HashMap<T, U, V, W, X, Y>::inlineAdd(KeyPassInType key, MappedPassInReferenceType mapped)
     {
         return m_impl.template add<HashMapTranslator<ValueTraits, HashFunctions> >(key, mapped);
     }

     template<typename T, typename U, typename V, typename W, typename X, typename Y>
     typename HashMap<T, U, V, W, X, Y>::AddResult
     HashMap<T, U, V, W, X, Y>::set(KeyPassInType key, MappedPassInType mapped)
     {
         AddResult result = inlineAdd(key, mapped);
         if (!result.isNewEntry) {
             // The inlineAdd call above found an existing hash table entry; we need to set the mapped value.
             MappedTraits::store(mapped, result.storedValue->value);
         }
         return result;
     }

     template<typename T, typename U, typename V, typename W, typename X, typename Y>
     template<typename HashTranslator, typename TYPE>
     typename HashMap<T, U, V, W, X, Y>::AddResult
     HashMap<T, U, V, W, X, Y>::add(const TYPE& key, MappedPassInType value)
     {
         return m_impl.template addPassingHashCode<HashMapTranslatorAdapter<ValueTraits, HashTranslator> >(key, value);
     }

     template<typename T, typename U, typename V, typename W, typename X, typename Y>
     typename HashMap<T, U, V, W, X, Y>::AddResult
     HashMap<T, U, V, W, X, Y>::add(KeyPassInType key, MappedPassInType mapped)
     {
         return inlineAdd(key, mapped);
     }

     template<typename T, typename U, typename V, typename W, typename X, typename Y>
     typename HashMap<T, U, V, W, X, Y>::MappedPeekType
     HashMap<T, U, V, W, X, Y>::get(KeyPeekInType key) const
     {
         ValueType* entry = const_cast<HashTableType&>(m_impl).lookup(key);
         if (!entry)
             return MappedTraits::peek(MappedTraits::emptyValue());
         return MappedTraits::peek(entry->value);
     }

     template<typename T, typename U, typename V, typename W, typename X, typename Y>
     inline void HashMap<T, U, V, W, X, Y>::remove(iterator it)
     {
         m_impl.remove(it.m_impl);
     }

     template<typename T, typename U, typename V, typename W, typename X, typename Y>
     inline void HashMap<T, U, V, W, X, Y>::remove(KeyPeekInType key)
     {
         remove(find(key));
     }

     template<typename T, typename U, typename V, typename W, typename X, typename Y>
     inline void HashMap<T, U, V, W, X, Y>::clear()
     {
         m_impl.clear();
     }

     template<typename T, typename U, typename V, typename W, typename X, typename Y>
     typename HashMap<T, U, V, W, X, Y>::MappedPassOutType
     HashMap<T, U, V, W, X, Y>::take(KeyPeekInType key)
     {
         iterator it = find(key);
         if (it == end())
             return MappedTraits::passOut(MappedTraits::emptyValue());
         MappedPassOutType result = MappedTraits::passOut(it->value);
         remove(it);
         return result;
     }

     template<typename T, typename U, typename V, typename W, typename X, typename Y>
     inline bool HashMap<T, U, V, W, X, Y>::isValidKey(KeyPeekInType key)
     {
         if (KeyTraits::isDeletedValue(key))
             return false;

         if (HashFunctions::safeToCompareToEmptyOrDeleted) {
             if (key == KeyTraits::emptyValue())
                 return false;
         } else {
             if (isHashTraitsEmptyValue<KeyTraits>(key))
                 return false;
         }

         return true;
     }

     template<typename T, typename U, typename V, typename W, typename X, typename Y>
     bool operator==(const HashMap<T, U, V, W, X, Y>& a, const HashMap<T, U, V, W, X, Y>& b)
     {
         if (a.size() != b.size())
             return false;

         typedef typename HashMap<T, U, V, W, X, Y>::const_iterator const_iterator;

         const_iterator aEnd = a.end();
         const_iterator bEnd = b.end();
         for (const_iterator it = a.begin(); it != aEnd; ++it) {
             const_iterator bPos = b.find(it->key);
             if (bPos == bEnd || it->value != bPos->value)
                 return false;
         }

         return true;
     }

     template<typename T, typename U, typename V, typename W, typename X, typename Y>
     inline bool operator!=(const HashMap<T, U, V, W, X, Y>& a, const HashMap<T, U, V, W, X, Y>& b)
     {
         return !(a == b);
     }

     template<typename T, typename U, typename V, typename W, typename X, typename Y, typename Z>
     inline void copyKeysToVector(const HashMap<T, U, V, W, X, Y>& collection, Z& vector)
     {
         typedef typename HashMap<T, U, V, W, X, Y>::const_iterator::Keys iterator;

         vector.resize(collection.size());

         iterator it = collection.begin().keys();
         iterator end = collection.end().keys();
         for (unsigned i = 0; it != end; ++it, ++i)
             vector[i] = *it;
     }

     template<typename T, typename U, typename V, typename W, typename X, typename Y, typename Z>
     inline void copyValuesToVector(const HashMap<T, U, V, W, X, Y>& collection, Z& vector)
     {
         typedef typename HashMap<T, U, V, W, X, Y>::const_iterator::Values iterator;

         vector.resize(collection.size());

         iterator it = collection.begin().values();
         iterator end = collection.end().values();
         for (unsigned i = 0; it != end; ++it, ++i)
             vector[i] = *it;
     }

 } // namespace WTF

 using WTF::HashMap;

 #endif  // SKY_ENGINE_WTF_HASHMAP_H_
	/*
	* Copyright (C) 2005, 2006, 2007, 2008, 2011 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 SKY_ENGINE_WTF_HASHMAP_H_
	#define SKY_ENGINE_WTF_HASHMAP_H_

	#include "sky/engine/wtf/DefaultAllocator.h"
	#include "sky/engine/wtf/HashTable.h"

	namespace WTF {

	template<typename KeyTraits, typename MappedTraits> struct HashMapValueTraits;

	template<typename T> struct ReferenceTypeMaker {
	typedef T& ReferenceType;
	};
	template<typename T> struct ReferenceTypeMaker<T&> {
	typedef T& ReferenceType;
	};

	struct KeyValuePairKeyExtractor {
	template<typename T>
	static const typename T::KeyType& extract(const T& p) { return p.key; }
	};

	// Note: empty or deleted key values are not allowed, using them may lead to undefined behavior.
	// For pointer keys this means that null pointers are not allowed unless you supply custom key traits.
	template<
	typename KeyArg,
	typename MappedArg,
	typename HashArg = typename DefaultHash<KeyArg>::Hash,
	typename KeyTraitsArg = HashTraits<KeyArg>,
	typename MappedTraitsArg = HashTraits<MappedArg>,
	typename Allocator = DefaultAllocator>
	class HashMap {
	WTF_USE_ALLOCATOR(HashMap, Allocator);
	private:
	typedef KeyTraitsArg KeyTraits;
	typedef MappedTraitsArg MappedTraits;
	typedef HashMapValueTraits<KeyTraits, MappedTraits> ValueTraits;

	public:
	typedef typename KeyTraits::TraitType KeyType;
	typedef typename KeyTraits::PassInType KeyPassInType;
	typedef const typename KeyTraits::PeekInType& KeyPeekInType;
	typedef typename MappedTraits::TraitType MappedType;
	typedef typename ValueTraits::TraitType ValueType;

	private:
	typedef typename MappedTraits::PassInType MappedPassInType;
	typedef typename MappedTraits::PassOutType MappedPassOutType;
	typedef typename MappedTraits::PeekOutType MappedPeekType;

	typedef typename ReferenceTypeMaker<MappedPassInType>::ReferenceType MappedPassInReferenceType;

	typedef HashArg HashFunctions;

	typedef HashTable<KeyType, ValueType, KeyValuePairKeyExtractor,
	HashFunctions, ValueTraits, KeyTraits, Allocator> HashTableType;

	class HashMapKeysProxy;
	class HashMapValuesProxy;

	public:
	typedef HashTableIteratorAdapter<HashTableType, ValueType> iterator;
	typedef HashTableConstIteratorAdapter<HashTableType, ValueType> const_iterator;
	typedef typename HashTableType::AddResult AddResult;

	public:
	void swap(HashMap& ref)
	{
	m_impl.swap(ref.m_impl);
	}

	void swap(typename Allocator::template OtherType<HashMap>::Type other)
	{
	HashMap& ref = Allocator::getOther(other);
	m_impl.swap(ref.m_impl);
	}

	unsigned size() const;
	unsigned capacity() const;
	bool isEmpty() const;

	// iterators iterate over pairs of keys and values
	iterator begin();
	iterator end();
	const_iterator begin() const;
	const_iterator end() const;

	HashMapKeysProxy& keys() { return static_cast<HashMapKeysProxy&>(*this); }
	const HashMapKeysProxy& keys() const { return static_cast<const HashMapKeysProxy&>(*this); }

	HashMapValuesProxy& values() { return static_cast<HashMapValuesProxy&>(*this); }
	const HashMapValuesProxy& values() const { return static_cast<const HashMapValuesProxy&>(*this); }

	iterator find(KeyPeekInType);
	const_iterator find(KeyPeekInType) const;
	bool contains(KeyPeekInType) const;
	MappedPeekType get(KeyPeekInType) const;

	// replaces value but not key if key is already present
	// return value is a pair of the iterator to the key location,
	// and a boolean that's true if a new value was actually added
	AddResult set(KeyPassInType, MappedPassInType);

	// does nothing if key is already present
	// return value is a pair of the iterator to the key location,
	// and a boolean that's true if a new value was actually added
	AddResult add(KeyPassInType, MappedPassInType);

	void remove(KeyPeekInType);
	void remove(iterator);
	void clear();
	template<typename Collection>
	void removeAll(const Collection& toBeRemoved) { WTF::removeAll(*this, toBeRemoved); }

	MappedPassOutType take(KeyPeekInType); // efficient combination of get with remove

	// An alternate version of find() that finds the object by hashing and comparing
	// with some other type, to avoid the cost of type conversion. HashTranslator
	// must have the following function members:
	// static unsigned hash(const T&);
	// static bool equal(const ValueType&, const T&);
	template<typename HashTranslator, typename T> iterator find(const T&);
	template<typename HashTranslator, typename T> const_iterator find(const T&) const;
	template<typename HashTranslator, typename T> bool contains(const T&) const;

	// An alternate version of add() that finds the object by hashing and comparing
	// with some other type, to avoid the cost of type conversion if the object is already
	// in the table. HashTranslator must have the following function members:
	// static unsigned hash(const T&);
	// static bool equal(const ValueType&, const T&);
	// static translate(ValueType&, const T&, unsigned hashCode);
	template<typename HashTranslator, typename T> AddResult add(const T&, MappedPassInType);

	static bool isValidKey(KeyPeekInType);

	private:
	AddResult inlineAdd(KeyPassInType, MappedPassInReferenceType);

	HashTableType m_impl;
	};

	template<typename KeyArg, typename MappedArg, typename HashArg, typename KeyTraitsArg, typename MappedTraitsArg, typename Allocator>
	class HashMap<KeyArg, MappedArg, HashArg, KeyTraitsArg, MappedTraitsArg, Allocator>::HashMapKeysProxy :
	private HashMap<KeyArg, MappedArg, HashArg, KeyTraitsArg, MappedTraitsArg, Allocator> {
	public:
	typedef HashMap<KeyArg, MappedArg, HashArg, KeyTraitsArg, MappedTraitsArg, Allocator> HashMapType;
	typedef typename HashMapType::iterator::Keys iterator;
	typedef typename HashMapType::const_iterator::Keys const_iterator;

	iterator begin()
	{
	return HashMapType::begin().keys();
	}

	iterator end()
	{
	return HashMapType::end().keys();
	}

	const_iterator begin() const
	{
	return HashMapType::begin().keys();
	}

	const_iterator end() const
	{
	return HashMapType::end().keys();
	}

	private:
	friend class HashMap;

	// These are intentionally not implemented.
	HashMapKeysProxy();
	HashMapKeysProxy(const HashMapKeysProxy&);
	HashMapKeysProxy& operator=(const HashMapKeysProxy&);
	~HashMapKeysProxy();
	};

	template<typename KeyArg, typename MappedArg, typename HashArg, typename KeyTraitsArg, typename MappedTraitsArg, typename Allocator>
	class HashMap<KeyArg, MappedArg, HashArg, KeyTraitsArg, MappedTraitsArg, Allocator>::HashMapValuesProxy :
	private HashMap<KeyArg, MappedArg, HashArg, KeyTraitsArg, MappedTraitsArg, Allocator> {
	public:
	typedef HashMap<KeyArg, MappedArg, HashArg, KeyTraitsArg, MappedTraitsArg, Allocator> HashMapType;
	typedef typename HashMapType::iterator::Values iterator;
	typedef typename HashMapType::const_iterator::Values const_iterator;

	iterator begin()
	{
	return HashMapType::begin().values();
	}

	iterator end()
	{
	return HashMapType::end().values();
	}

	const_iterator begin() const
	{
	return HashMapType::begin().values();
	}

	const_iterator end() const
	{
	return HashMapType::end().values();
	}

	private:
	friend class HashMap;

	// These are intentionally not implemented.
	HashMapValuesProxy();
	HashMapValuesProxy(const HashMapValuesProxy&);
	HashMapValuesProxy& operator=(const HashMapValuesProxy&);
	~HashMapValuesProxy();
	};

	template<typename KeyTraits, typename MappedTraits> struct HashMapValueTraits : KeyValuePairHashTraits<KeyTraits, MappedTraits> {
	static const bool hasIsEmptyValueFunction = true;
	static bool isEmptyValue(const typename KeyValuePairHashTraits<KeyTraits, MappedTraits>::TraitType& value)
	{
	return isHashTraitsEmptyValue<KeyTraits>(value.key);
	}
	};

	template<typename ValueTraits, typename HashFunctions>
	struct HashMapTranslator {
	template<typename T> static unsigned hash(const T& key) { return HashFunctions::hash(key); }
	template<typename T, typename U> static bool equal(const T& a, const U& b) { return HashFunctions::equal(a, b); }
	template<typename T, typename U, typename V> static void translate(T& location, const U& key, const V& mapped)
	{
	location.key = key;
	ValueTraits::ValueTraits::store(mapped, location.value);
	}
	};

	template<typename ValueTraits, typename Translator>
	struct HashMapTranslatorAdapter {
	template<typename T> static unsigned hash(const T& key) { return Translator::hash(key); }
	template<typename T, typename U> static bool equal(const T& a, const U& b) { return Translator::equal(a, b); }
	template<typename T, typename U, typename V> static void translate(T& location, const U& key, const V& mapped, unsigned hashCode)
	{
	Translator::translate(location.key, key, hashCode);
	ValueTraits::ValueTraits::store(mapped, location.value);
	}
	};

	template<typename T, typename U, typename V, typename W, typename X, typename Y>
	inline unsigned HashMap<T, U, V, W, X, Y>::size() const
	{
	return m_impl.size();
	}

	template<typename T, typename U, typename V, typename W, typename X, typename Y>
	inline unsigned HashMap<T, U, V, W, X, Y>::capacity() const
	{
	return m_impl.capacity();
	}

	template<typename T, typename U, typename V, typename W, typename X, typename Y>
	inline bool HashMap<T, U, V, W, X, Y>::isEmpty() const
	{
	return m_impl.isEmpty();
	}

	template<typename T, typename U, typename V, typename W, typename X, typename Y>
	inline typename HashMap<T, U, V, W, X, Y>::iterator HashMap<T, U, V, W, X, Y>::begin()
	{
	return m_impl.begin();
	}

	template<typename T, typename U, typename V, typename W, typename X, typename Y>
	inline typename HashMap<T, U, V, W, X, Y>::iterator HashMap<T, U, V, W, X, Y>::end()
	{
	return m_impl.end();
	}

	template<typename T, typename U, typename V, typename W, typename X, typename Y>
	inline typename HashMap<T, U, V, W, X, Y>::const_iterator HashMap<T, U, V, W, X, Y>::begin() const
	{
	return m_impl.begin();
	}

	template<typename T, typename U, typename V, typename W, typename X, typename Y>
	inline typename HashMap<T, U, V, W, X, Y>::const_iterator HashMap<T, U, V, W, X, Y>::end() const
	{
	return m_impl.end();
	}

	template<typename T, typename U, typename V, typename W, typename X, typename Y>
	inline typename HashMap<T, U, V, W, X, Y>::iterator HashMap<T, U, V, W, X, Y>::find(KeyPeekInType key)
	{
	return m_impl.find(key);
	}

	template<typename T, typename U, typename V, typename W, typename X, typename Y>
	inline typename HashMap<T, U, V, W, X, Y>::const_iterator HashMap<T, U, V, W, X, Y>::find(KeyPeekInType key) const
	{
	return m_impl.find(key);
	}

	template<typename T, typename U, typename V, typename W, typename X, typename Y>
	inline bool HashMap<T, U, V, W, X, Y>::contains(KeyPeekInType key) const
	{
	return m_impl.contains(key);
	}

	template<typename T, typename U, typename V, typename W, typename X, typename Y>
	template<typename HashTranslator, typename TYPE>
	inline typename HashMap<T, U, V, W, X, Y>::iterator
	HashMap<T, U, V, W, X, Y>::find(const TYPE& value)
	{
	return m_impl.template find<HashMapTranslatorAdapter<ValueTraits, HashTranslator> >(value);
	}

	template<typename T, typename U, typename V, typename W, typename X, typename Y>
	template<typename HashTranslator, typename TYPE>
	inline typename HashMap<T, U, V, W, X, Y>::const_iterator
	HashMap<T, U, V, W, X, Y>::find(const TYPE& value) const
	{
	return m_impl.template find<HashMapTranslatorAdapter<ValueTraits, HashTranslator> >(value);
	}

	template<typename T, typename U, typename V, typename W, typename X, typename Y>
	template<typename HashTranslator, typename TYPE>
	inline bool
	HashMap<T, U, V, W, X, Y>::contains(const TYPE& value) const
	{
	return m_impl.template contains<HashMapTranslatorAdapter<ValueTraits, HashTranslator> >(value);
	}

	template<typename T, typename U, typename V, typename W, typename X, typename Y>
	typename HashMap<T, U, V, W, X, Y>::AddResult
	HashMap<T, U, V, W, X, Y>::inlineAdd(KeyPassInType key, MappedPassInReferenceType mapped)
	{
	return m_impl.template add<HashMapTranslator<ValueTraits, HashFunctions> >(key, mapped);
	}

	template<typename T, typename U, typename V, typename W, typename X, typename Y>
	typename HashMap<T, U, V, W, X, Y>::AddResult
	HashMap<T, U, V, W, X, Y>::set(KeyPassInType key, MappedPassInType mapped)
	{
	AddResult result = inlineAdd(key, mapped);
	if (!result.isNewEntry) {
	// The inlineAdd call above found an existing hash table entry; we need to set the mapped value.
	MappedTraits::store(mapped, result.storedValue->value);
	}
	return result;
	}

	template<typename T, typename U, typename V, typename W, typename X, typename Y>
	template<typename HashTranslator, typename TYPE>
	typename HashMap<T, U, V, W, X, Y>::AddResult
	HashMap<T, U, V, W, X, Y>::add(const TYPE& key, MappedPassInType value)
	{
	return m_impl.template addPassingHashCode<HashMapTranslatorAdapter<ValueTraits, HashTranslator> >(key, value);
	}

	template<typename T, typename U, typename V, typename W, typename X, typename Y>
	typename HashMap<T, U, V, W, X, Y>::AddResult
	HashMap<T, U, V, W, X, Y>::add(KeyPassInType key, MappedPassInType mapped)
	{
	return inlineAdd(key, mapped);
	}

	template<typename T, typename U, typename V, typename W, typename X, typename Y>
	typename HashMap<T, U, V, W, X, Y>::MappedPeekType
	HashMap<T, U, V, W, X, Y>::get(KeyPeekInType key) const
	{
	ValueType* entry = const_cast<HashTableType&>(m_impl).lookup(key);
	if (!entry)
	return MappedTraits::peek(MappedTraits::emptyValue());
	return MappedTraits::peek(entry->value);
	}

	template<typename T, typename U, typename V, typename W, typename X, typename Y>
	inline void HashMap<T, U, V, W, X, Y>::remove(iterator it)
	{
	m_impl.remove(it.m_impl);
	}

	template<typename T, typename U, typename V, typename W, typename X, typename Y>
	inline void HashMap<T, U, V, W, X, Y>::remove(KeyPeekInType key)
	{
	remove(find(key));
	}

	template<typename T, typename U, typename V, typename W, typename X, typename Y>
	inline void HashMap<T, U, V, W, X, Y>::clear()
	{
	m_impl.clear();
	}

	template<typename T, typename U, typename V, typename W, typename X, typename Y>
	typename HashMap<T, U, V, W, X, Y>::MappedPassOutType
	HashMap<T, U, V, W, X, Y>::take(KeyPeekInType key)
	{
	iterator it = find(key);
	if (it == end())
	return MappedTraits::passOut(MappedTraits::emptyValue());
	MappedPassOutType result = MappedTraits::passOut(it->value);
	remove(it);
	return result;
	}

	template<typename T, typename U, typename V, typename W, typename X, typename Y>
	inline bool HashMap<T, U, V, W, X, Y>::isValidKey(KeyPeekInType key)
	{
	if (KeyTraits::isDeletedValue(key))
	return false;

	if (HashFunctions::safeToCompareToEmptyOrDeleted) {
	if (key == KeyTraits::emptyValue())
	return false;
	} else {
	if (isHashTraitsEmptyValue<KeyTraits>(key))
	return false;
	}

	return true;
	}

	template<typename T, typename U, typename V, typename W, typename X, typename Y>
	bool operator==(const HashMap<T, U, V, W, X, Y>& a, const HashMap<T, U, V, W, X, Y>& b)
	{
	if (a.size() != b.size())
	return false;

	typedef typename HashMap<T, U, V, W, X, Y>::const_iterator const_iterator;

	const_iterator aEnd = a.end();
	const_iterator bEnd = b.end();
	for (const_iterator it = a.begin(); it != aEnd; ++it) {
	const_iterator bPos = b.find(it->key);
	if (bPos == bEnd \|\| it->value != bPos->value)
	return false;
	}

	return true;
	}

	template<typename T, typename U, typename V, typename W, typename X, typename Y>
	inline bool operator!=(const HashMap<T, U, V, W, X, Y>& a, const HashMap<T, U, V, W, X, Y>& b)
	{
	return !(a == b);
	}

	template<typename T, typename U, typename V, typename W, typename X, typename Y, typename Z>
	inline void copyKeysToVector(const HashMap<T, U, V, W, X, Y>& collection, Z& vector)
	{
	typedef typename HashMap<T, U, V, W, X, Y>::const_iterator::Keys iterator;

	vector.resize(collection.size());

	iterator it = collection.begin().keys();
	iterator end = collection.end().keys();
	for (unsigned i = 0; it != end; ++it, ++i)
	vector[i] = *it;
	}

	template<typename T, typename U, typename V, typename W, typename X, typename Y, typename Z>
	inline void copyValuesToVector(const HashMap<T, U, V, W, X, Y>& collection, Z& vector)
	{
	typedef typename HashMap<T, U, V, W, X, Y>::const_iterator::Values iterator;

	vector.resize(collection.size());

	iterator it = collection.begin().values();
	iterator end = collection.end().values();
	for (unsigned i = 0; it != end; ++it, ++i)
	vector[i] = *it;
	}

	} // namespace WTF

	using WTF::HashMap;

	#endif // SKY_ENGINE_WTF_HASHMAP_H_