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/*
* Copyright (C) 2005, 2006, 2007, 2008, 2011, 2013, 2017 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_HashSet_h
#define WTF_HashSet_h
#include <initializer_list>
#include <wtf/GetPtr.h>
#include <wtf/HashTable.h>
namespace WTF {
struct IdentityExtractor;
template<typename Value, typename HashFunctions, typename Traits> class HashSet;
template<typename ValueArg, typename HashArg = typename DefaultHash<ValueArg>::Hash,
typename TraitsArg = HashTraits<ValueArg>> class HashSet final {
WTF_MAKE_FAST_ALLOCATED;
private:
typedef HashArg HashFunctions;
typedef TraitsArg ValueTraits;
typedef typename ValueTraits::TakeType TakeType;
public:
typedef typename ValueTraits::TraitType ValueType;
private:
typedef HashTable<ValueType, ValueType, IdentityExtractor,
HashFunctions, ValueTraits, ValueTraits> HashTableType;
public:
typedef HashTableConstIteratorAdapter<HashTableType, ValueType> iterator;
typedef HashTableConstIteratorAdapter<HashTableType, ValueType> const_iterator;
typedef typename HashTableType::AddResult AddResult;
HashSet()
{
}
HashSet(std::initializer_list<ValueArg> initializerList)
{
for (const auto& value : initializerList)
add(value);
}
void swap(HashSet&);
unsigned size() const;
unsigned capacity() const;
bool isEmpty() const;
iterator begin() const;
iterator end() const;
iterator find(const ValueType&) const;
bool contains(const ValueType&) const;
// 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&) const;
template<typename HashTranslator, typename T> bool contains(const T&) const;
// The return value includes both an iterator to the added value's location,
// and an isNewEntry bool that indicates if it is a new or existing entry in the set.
AddResult add(const ValueType&);
AddResult add(ValueType&&);
void add(std::initializer_list<std::reference_wrapper<const ValueType>>);
void addVoid(const ValueType&);
void addVoid(ValueType&&);
// 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&);
// Attempts to add a list of things to the set. Returns true if any of
// them are new to the set. Returns false if the set is unchanged.
template<typename IteratorType>
bool add(IteratorType begin, IteratorType end);
bool remove(const ValueType&);
bool remove(iterator);
template<typename Functor>
void removeIf(const Functor&);
void clear();
TakeType take(const ValueType&);
TakeType take(iterator);
TakeType takeAny();
// Overloads for smart pointer values that take the raw pointer type as the parameter.
template<typename V = ValueType> typename std::enable_if<IsSmartPtr<V>::value, iterator>::type find(typename GetPtrHelper<V>::PtrType) const;
template<typename V = ValueType> typename std::enable_if<IsSmartPtr<V>::value, bool>::type contains(typename GetPtrHelper<V>::PtrType) const;
template<typename V = ValueType> typename std::enable_if<IsSmartPtr<V>::value, bool>::type remove(typename GetPtrHelper<V>::PtrType);
template<typename V = ValueType> typename std::enable_if<IsSmartPtr<V>::value, TakeType>::type take(typename GetPtrHelper<V>::PtrType);
static bool isValidValue(const ValueType&);
template<typename OtherCollection>
bool operator==(const OtherCollection&) const;
template<typename OtherCollection>
bool operator!=(const OtherCollection&) const;
private:
HashTableType m_impl;
};
struct IdentityExtractor {
template<typename T> static const T& extract(const T& t) { return t; }
};
template<typename ValueTraits, typename HashFunctions>
struct HashSetTranslator {
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, U&&, V&& value)
{
ValueTraits::assignToEmpty(location, std::forward<V>(value));
}
};
template<typename Translator>
struct HashSetTranslatorAdapter {
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> static void translate(T& location, const U& key, const U&, unsigned hashCode)
{
Translator::translate(location, key, hashCode);
}
};
template<typename T, typename U, typename V>
inline void HashSet<T, U, V>::swap(HashSet& other)
{
m_impl.swap(other.m_impl);
}
template<typename T, typename U, typename V>
inline unsigned HashSet<T, U, V>::size() const
{
return m_impl.size();
}
template<typename T, typename U, typename V>
inline unsigned HashSet<T, U, V>::capacity() const
{
return m_impl.capacity();
}
template<typename T, typename U, typename V>
inline bool HashSet<T, U, V>::isEmpty() const
{
return m_impl.isEmpty();
}
template<typename T, typename U, typename V>
inline auto HashSet<T, U, V>::begin() const -> iterator
{
return m_impl.begin();
}
template<typename T, typename U, typename V>
inline auto HashSet<T, U, V>::end() const -> iterator
{
return m_impl.end();
}
template<typename T, typename U, typename V>
inline auto HashSet<T, U, V>::find(const ValueType& value) const -> iterator
{
return m_impl.find(value);
}
template<typename T, typename U, typename V>
inline bool HashSet<T, U, V>::contains(const ValueType& value) const
{
return m_impl.contains(value);
}
template<typename Value, typename HashFunctions, typename Traits>
template<typename HashTranslator, typename T>
inline auto HashSet<Value, HashFunctions, Traits>::find(const T& value) const -> iterator
{
return m_impl.template find<HashSetTranslatorAdapter<HashTranslator>>(value);
}
template<typename Value, typename HashFunctions, typename Traits>
template<typename HashTranslator, typename T>
inline bool HashSet<Value, HashFunctions, Traits>::contains(const T& value) const
{
return m_impl.template contains<HashSetTranslatorAdapter<HashTranslator>>(value);
}
template<typename T, typename U, typename V>
inline auto HashSet<T, U, V>::add(const ValueType& value) -> AddResult
{
return m_impl.add(value);
}
template<typename T, typename U, typename V>
inline auto HashSet<T, U, V>::add(ValueType&& value) -> AddResult
{
return m_impl.add(WTFMove(value));
}
template<typename T, typename U, typename V>
inline void HashSet<T, U, V>::addVoid(const ValueType& value)
{
m_impl.add(value);
}
template<typename T, typename U, typename V>
inline void HashSet<T, U, V>::addVoid(ValueType&& value)
{
m_impl.add(WTFMove(value));
}
template<typename Value, typename HashFunctions, typename Traits>
template<typename HashTranslator, typename T>
inline auto HashSet<Value, HashFunctions, Traits>::add(const T& value) -> AddResult
{
return m_impl.template addPassingHashCode<HashSetTranslatorAdapter<HashTranslator>>(value, value);
}
template<typename T, typename U, typename V>
template<typename IteratorType>
inline bool HashSet<T, U, V>::add(IteratorType begin, IteratorType end)
{
bool changed = false;
for (IteratorType iter = begin; iter != end; ++iter)
changed |= add(*iter).isNewEntry;
return changed;
}
template<typename T, typename U, typename V>
inline bool HashSet<T, U, V>::remove(iterator it)
{
if (it.m_impl == m_impl.end())
return false;
m_impl.internalCheckTableConsistency();
m_impl.removeWithoutEntryConsistencyCheck(it.m_impl);
return true;
}
template<typename T, typename U, typename V>
inline bool HashSet<T, U, V>::remove(const ValueType& value)
{
return remove(find(value));
}
template<typename T, typename U, typename V>
template<typename Functor>
inline void HashSet<T, U, V>::removeIf(const Functor& functor)
{
m_impl.removeIf(functor);
}
template<typename T, typename U, typename V>
inline void HashSet<T, U, V>::clear()
{
m_impl.clear();
}
template<typename T, typename U, typename V>
inline auto HashSet<T, U, V>::take(iterator it) -> TakeType
{
if (it == end())
return ValueTraits::take(ValueTraits::emptyValue());
auto result = ValueTraits::take(WTFMove(const_cast<ValueType&>(*it)));
remove(it);
return result;
}
template<typename T, typename U, typename V>
inline auto HashSet<T, U, V>::take(const ValueType& value) -> TakeType
{
return take(find(value));
}
template<typename T, typename U, typename V>
inline auto HashSet<T, U, V>::takeAny() -> TakeType
{
return take(begin());
}
template<typename Value, typename HashFunctions, typename Traits>
template<typename V>
inline auto HashSet<Value, HashFunctions, Traits>::find(typename GetPtrHelper<V>::PtrType value) const -> typename std::enable_if<IsSmartPtr<V>::value, iterator>::type
{
return m_impl.template find<HashSetTranslator<Traits, HashFunctions>>(value);
}
template<typename Value, typename HashFunctions, typename Traits>
template<typename V>
inline auto HashSet<Value, HashFunctions, Traits>::contains(typename GetPtrHelper<V>::PtrType value) const -> typename std::enable_if<IsSmartPtr<V>::value, bool>::type
{
return m_impl.template contains<HashSetTranslator<Traits, HashFunctions>>(value);
}
template<typename Value, typename HashFunctions, typename Traits>
template<typename V>
inline auto HashSet<Value, HashFunctions, Traits>::remove(typename GetPtrHelper<V>::PtrType value) -> typename std::enable_if<IsSmartPtr<V>::value, bool>::type
{
return remove(find(value));
}
template<typename Value, typename HashFunctions, typename Traits>
template<typename V>
inline auto HashSet<Value, HashFunctions, Traits>::take(typename GetPtrHelper<V>::PtrType value) -> typename std::enable_if<IsSmartPtr<V>::value, TakeType>::type
{
return take(find(value));
}
template<typename T, typename U, typename V>
inline bool HashSet<T, U, V>::isValidValue(const ValueType& value)
{
if (ValueTraits::isDeletedValue(value))
return false;
if (HashFunctions::safeToCompareToEmptyOrDeleted) {
if (value == ValueTraits::emptyValue())
return false;
} else {
if (isHashTraitsEmptyValue<ValueTraits>(value))
return false;
}
return true;
}
template<typename C, typename W>
inline void copyToVector(const C& collection, W& vector)
{
vector.resize(collection.size());
std::copy(collection.begin(), collection.end(), vector.begin());
}
template<typename T, typename U, typename V>
template<typename OtherCollection>
inline bool HashSet<T, U, V>::operator==(const OtherCollection& otherCollection) const
{
if (size() != otherCollection.size())
return false;
for (const auto& other : otherCollection) {
if (!contains(other))
return false;
}
return true;
}
template<typename T, typename U, typename V>
template<typename OtherCollection>
inline bool HashSet<T, U, V>::operator!=(const OtherCollection& otherCollection) const
{
return !(*this == otherCollection);
}
template<typename T, typename U, typename V>
void HashSet<T, U, V>::add(std::initializer_list<std::reference_wrapper<const ValueType>> list)
{
for (auto& value : list)
add(value);
}
} // namespace WTF
using WTF::HashSet;
#endif /* WTF_HashSet_h */