| /* |
| * Copyright (C) 2005, 2006, 2008, 2013, 2016 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_HashCountedSet_h |
| #define WTF_HashCountedSet_h |
| |
| #include <initializer_list> |
| #include <wtf/Assertions.h> |
| #include <wtf/HashMap.h> |
| #include <wtf/Vector.h> |
| |
| namespace WTF { |
| |
| template<typename Value, typename HashFunctions = typename DefaultHash<Value>::Hash, typename Traits = HashTraits<Value>> |
| class HashCountedSet final { |
| WTF_MAKE_FAST_ALLOCATED; |
| private: |
| typedef HashMap<Value, unsigned, HashFunctions, Traits> ImplType; |
| public: |
| typedef Value ValueType; |
| typedef typename ImplType::iterator iterator; |
| typedef typename ImplType::const_iterator const_iterator; |
| typedef typename ImplType::AddResult AddResult; |
| |
| HashCountedSet() |
| { |
| } |
| |
| HashCountedSet(std::initializer_list<typename ImplType::KeyValuePairType> initializerList) |
| { |
| for (const auto& keyValuePair : initializerList) |
| add(keyValuePair.key, keyValuePair.value); |
| } |
| |
| HashCountedSet(std::initializer_list<typename ImplType::KeyType> initializerList) |
| { |
| for (const auto& value : initializerList) |
| add(value); |
| } |
| |
| void swap(HashCountedSet&); |
| |
| unsigned size() const; |
| unsigned capacity() const; |
| bool isEmpty() const; |
| |
| // Iterators iterate over pairs of values and counts. |
| iterator begin(); |
| iterator end(); |
| const_iterator begin() const; |
| const_iterator end() const; |
| |
| iterator find(const ValueType&); |
| const_iterator find(const ValueType&) const; |
| bool contains(const ValueType&) const; |
| unsigned count(const ValueType&) const; |
| |
| // Increments the count if an equal value is already present. |
| // The return value includes both an iterator to the value's location, |
| // and an isNewEntry bool that indicates whether it is a new or existing entry. |
| AddResult add(const ValueType&); |
| AddResult add(ValueType&&); |
| |
| // Increments the count of a value by the passed amount. |
| AddResult add(const ValueType&, unsigned); |
| AddResult add(ValueType&&, unsigned); |
| |
| // Decrements the count of the value, and removes it if count goes down to zero. |
| // Returns true if the value is removed. |
| bool remove(const ValueType&); |
| bool remove(iterator); |
| |
| // Removes the value, regardless of its count. |
| // Returns true if a value was removed. |
| bool removeAll(iterator); |
| bool removeAll(const ValueType&); |
| |
| // Clears the whole set. |
| void clear(); |
| |
| // Overloads for smart pointer keys 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); |
| template<typename V = ValueType> typename std::enable_if<IsSmartPtr<V>::value, const_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, unsigned>::type count(typename GetPtrHelper<V>::PtrType) const; |
| template<typename V = ValueType> typename std::enable_if<IsSmartPtr<V>::value, bool>::type remove(typename GetPtrHelper<V>::PtrType); |
| |
| private: |
| ImplType m_impl; |
| }; |
| |
| |
| template<typename Value, typename HashFunctions, typename Traits> |
| inline void HashCountedSet<Value, HashFunctions, Traits>::swap(HashCountedSet& other) |
| { |
| m_impl.swap(other.m_impl); |
| } |
| |
| template<typename Value, typename HashFunctions, typename Traits> |
| inline unsigned HashCountedSet<Value, HashFunctions, Traits>::size() const |
| { |
| return m_impl.size(); |
| } |
| |
| template<typename Value, typename HashFunctions, typename Traits> |
| inline unsigned HashCountedSet<Value, HashFunctions, Traits>::capacity() const |
| { |
| return m_impl.capacity(); |
| } |
| |
| template<typename Value, typename HashFunctions, typename Traits> |
| inline bool HashCountedSet<Value, HashFunctions, Traits>::isEmpty() const |
| { |
| return size() == 0; |
| } |
| |
| template<typename Value, typename HashFunctions, typename Traits> |
| inline typename HashCountedSet<Value, HashFunctions, Traits>::iterator HashCountedSet<Value, HashFunctions, Traits>::begin() |
| { |
| return m_impl.begin(); |
| } |
| |
| template<typename Value, typename HashFunctions, typename Traits> |
| inline typename HashCountedSet<Value, HashFunctions, Traits>::iterator HashCountedSet<Value, HashFunctions, Traits>::end() |
| { |
| return m_impl.end(); |
| } |
| |
| template<typename Value, typename HashFunctions, typename Traits> |
| inline typename HashCountedSet<Value, HashFunctions, Traits>::const_iterator HashCountedSet<Value, HashFunctions, Traits>::begin() const |
| { |
| return m_impl.begin(); |
| } |
| |
| template<typename Value, typename HashFunctions, typename Traits> |
| inline typename HashCountedSet<Value, HashFunctions, Traits>::const_iterator HashCountedSet<Value, HashFunctions, Traits>::end() const |
| { |
| return m_impl.end(); |
| } |
| |
| template<typename Value, typename HashFunctions, typename Traits> |
| inline typename HashCountedSet<Value, HashFunctions, Traits>::iterator HashCountedSet<Value, HashFunctions, Traits>::find(const ValueType& value) |
| { |
| return m_impl.find(value); |
| } |
| |
| template<typename Value, typename HashFunctions, typename Traits> |
| inline typename HashCountedSet<Value, HashFunctions, Traits>::const_iterator HashCountedSet<Value, HashFunctions, Traits>::find(const ValueType& value) const |
| { |
| return m_impl.find(value); |
| } |
| |
| template<typename Value, typename HashFunctions, typename Traits> |
| inline bool HashCountedSet<Value, HashFunctions, Traits>::contains(const ValueType& value) const |
| { |
| return m_impl.contains(value); |
| } |
| |
| template<typename Value, typename HashFunctions, typename Traits> |
| inline unsigned HashCountedSet<Value, HashFunctions, Traits>::count(const ValueType& value) const |
| { |
| return m_impl.get(value); |
| } |
| |
| template<typename Value, typename HashFunctions, typename Traits> |
| inline typename HashCountedSet<Value, HashFunctions, Traits>::AddResult HashCountedSet<Value, HashFunctions, Traits>::add(const ValueType &value) |
| { |
| AddResult result = m_impl.add(value, 0); |
| ++result.iterator->value; |
| return result; |
| } |
| |
| template<typename Value, typename HashFunctions, typename Traits> |
| inline typename HashCountedSet<Value, HashFunctions, Traits>::AddResult HashCountedSet<Value, HashFunctions, Traits>::add(ValueType&& value) |
| { |
| AddResult result = m_impl.add(std::forward<Value>(value), 0); |
| ++result.iterator->value; |
| return result; |
| } |
| |
| template<typename Value, typename HashFunctions, typename Traits> |
| inline typename HashCountedSet<Value, HashFunctions, Traits>::AddResult HashCountedSet<Value, HashFunctions, Traits>::add(const ValueType& value, unsigned count) |
| { |
| AddResult result = m_impl.add(value, 0); |
| result.iterator->value += count; |
| return result; |
| } |
| |
| template<typename Value, typename HashFunctions, typename Traits> |
| inline typename HashCountedSet<Value, HashFunctions, Traits>::AddResult HashCountedSet<Value, HashFunctions, Traits>::add(ValueType&& value, unsigned count) |
| { |
| AddResult result = m_impl.add(std::forward<Value>(value), 0); |
| result.iterator->value += count; |
| return result; |
| } |
| |
| template<typename Value, typename HashFunctions, typename Traits> |
| inline bool HashCountedSet<Value, HashFunctions, Traits>::remove(const ValueType& value) |
| { |
| return remove(find(value)); |
| } |
| |
| template<typename Value, typename HashFunctions, typename Traits> |
| inline bool HashCountedSet<Value, HashFunctions, Traits>::remove(iterator it) |
| { |
| if (it == end()) |
| return false; |
| |
| unsigned oldVal = it->value; |
| ASSERT(oldVal); |
| unsigned newVal = oldVal - 1; |
| if (newVal) { |
| it->value = newVal; |
| return false; |
| } |
| |
| m_impl.remove(it); |
| return true; |
| } |
| |
| template<typename Value, typename HashFunctions, typename Traits> |
| inline bool HashCountedSet<Value, HashFunctions, Traits>::removeAll(const ValueType& value) |
| { |
| return removeAll(find(value)); |
| } |
| |
| template<typename Value, typename HashFunctions, typename Traits> |
| inline bool HashCountedSet<Value, HashFunctions, Traits>::removeAll(iterator it) |
| { |
| if (it == end()) |
| return false; |
| |
| m_impl.remove(it); |
| return true; |
| } |
| |
| template<typename Value, typename HashFunctions, typename Traits> |
| inline void HashCountedSet<Value, HashFunctions, Traits>::clear() |
| { |
| m_impl.clear(); |
| } |
| |
| template<typename Value, typename HashFunctions, typename Traits, typename VectorType> |
| inline void copyToVector(const HashCountedSet<Value, HashFunctions, Traits>& collection, VectorType& vector) |
| { |
| typedef typename HashCountedSet<Value, HashFunctions, Traits>::const_iterator iterator; |
| |
| vector.resize(collection.size()); |
| |
| iterator it = collection.begin(); |
| iterator end = collection.end(); |
| for (unsigned i = 0; it != end; ++it, ++i) |
| vector[i] = *it; |
| } |
| |
| template<typename Value, typename HashFunctions, typename Traits> |
| inline void copyToVector(const HashCountedSet<Value, HashFunctions, Traits>& collection, Vector<Value>& vector) |
| { |
| typedef typename HashCountedSet<Value, HashFunctions, Traits>::const_iterator iterator; |
| |
| vector.resize(collection.size()); |
| |
| iterator it = collection.begin(); |
| iterator end = collection.end(); |
| for (unsigned i = 0; it != end; ++it, ++i) |
| vector[i] = (*it).key; |
| } |
| |
| template<typename Value, typename HashFunctions, typename Traits> |
| template<typename V> |
| inline auto HashCountedSet<Value, HashFunctions, Traits>::find(typename GetPtrHelper<V>::PtrType value) -> typename std::enable_if<IsSmartPtr<V>::value, iterator>::type |
| { |
| return m_impl.find(value); |
| } |
| |
| template<typename Value, typename HashFunctions, typename Traits> |
| template<typename V> |
| inline auto HashCountedSet<Value, HashFunctions, Traits>::find(typename GetPtrHelper<V>::PtrType value) const -> typename std::enable_if<IsSmartPtr<V>::value, const_iterator>::type |
| { |
| return m_impl.find(value); |
| } |
| |
| template<typename Value, typename HashFunctions, typename Traits> |
| template<typename V> |
| inline auto HashCountedSet<Value, HashFunctions, Traits>::contains(typename GetPtrHelper<V>::PtrType value) const -> typename std::enable_if<IsSmartPtr<V>::value, bool>::type |
| { |
| return m_impl.contains(value); |
| } |
| |
| template<typename Value, typename HashFunctions, typename Traits> |
| template<typename V> |
| inline auto HashCountedSet<Value, HashFunctions, Traits>::count(typename GetPtrHelper<V>::PtrType value) const -> typename std::enable_if<IsSmartPtr<V>::value, unsigned>::type |
| { |
| return m_impl.get(value); |
| } |
| |
| template<typename Value, typename HashFunctions, typename Traits> |
| template<typename V> |
| inline auto HashCountedSet<Value, HashFunctions, Traits>::remove(typename GetPtrHelper<V>::PtrType value) -> typename std::enable_if<IsSmartPtr<V>::value, bool>::type |
| { |
| return remove(find(value)); |
| } |
| |
| } // namespace WTF |
| |
| using WTF::HashCountedSet; |
| |
| #endif /* WTF_HashCountedSet_h */ |
