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326 lines
12 KiB
C++
326 lines
12 KiB
C++
/*
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* Copyright (C) 2005, 2006, 2008, 2013, 2016 Apple Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef WTF_HashCountedSet_h
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#define WTF_HashCountedSet_h
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#include <initializer_list>
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#include <wtf/Assertions.h>
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#include <wtf/HashMap.h>
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#include <wtf/Vector.h>
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namespace WTF {
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template<typename Value, typename HashFunctions = typename DefaultHash<Value>::Hash, typename Traits = HashTraits<Value>>
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class HashCountedSet final {
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WTF_MAKE_FAST_ALLOCATED;
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private:
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typedef HashMap<Value, unsigned, HashFunctions, Traits> ImplType;
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public:
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typedef Value ValueType;
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typedef typename ImplType::iterator iterator;
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typedef typename ImplType::const_iterator const_iterator;
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typedef typename ImplType::AddResult AddResult;
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HashCountedSet()
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{
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}
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HashCountedSet(std::initializer_list<typename ImplType::KeyValuePairType> initializerList)
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{
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for (const auto& keyValuePair : initializerList)
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add(keyValuePair.key, keyValuePair.value);
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}
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HashCountedSet(std::initializer_list<typename ImplType::KeyType> initializerList)
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{
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for (const auto& value : initializerList)
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add(value);
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}
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void swap(HashCountedSet&);
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unsigned size() const;
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unsigned capacity() const;
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bool isEmpty() const;
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// Iterators iterate over pairs of values and counts.
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iterator begin();
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iterator end();
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const_iterator begin() const;
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const_iterator end() const;
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iterator find(const ValueType&);
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const_iterator find(const ValueType&) const;
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bool contains(const ValueType&) const;
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unsigned count(const ValueType&) const;
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// Increments the count if an equal value is already present.
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// The return value includes both an iterator to the value's location,
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// and an isNewEntry bool that indicates whether it is a new or existing entry.
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AddResult add(const ValueType&);
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AddResult add(ValueType&&);
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// Increments the count of a value by the passed amount.
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AddResult add(const ValueType&, unsigned);
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AddResult add(ValueType&&, unsigned);
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// Decrements the count of the value, and removes it if count goes down to zero.
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// Returns true if the value is removed.
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bool remove(const ValueType&);
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bool remove(iterator);
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// Removes the value, regardless of its count.
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// Returns true if a value was removed.
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bool removeAll(iterator);
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bool removeAll(const ValueType&);
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// Clears the whole set.
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void clear();
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// Overloads for smart pointer keys that take the raw pointer type as the parameter.
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template<typename V = ValueType> typename std::enable_if<IsSmartPtr<V>::value, iterator>::type find(typename GetPtrHelper<V>::PtrType);
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template<typename V = ValueType> typename std::enable_if<IsSmartPtr<V>::value, const_iterator>::type find(typename GetPtrHelper<V>::PtrType) const;
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template<typename V = ValueType> typename std::enable_if<IsSmartPtr<V>::value, bool>::type contains(typename GetPtrHelper<V>::PtrType) const;
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template<typename V = ValueType> typename std::enable_if<IsSmartPtr<V>::value, unsigned>::type count(typename GetPtrHelper<V>::PtrType) const;
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template<typename V = ValueType> typename std::enable_if<IsSmartPtr<V>::value, bool>::type remove(typename GetPtrHelper<V>::PtrType);
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private:
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ImplType m_impl;
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};
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template<typename Value, typename HashFunctions, typename Traits>
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inline void HashCountedSet<Value, HashFunctions, Traits>::swap(HashCountedSet& other)
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{
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m_impl.swap(other.m_impl);
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}
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template<typename Value, typename HashFunctions, typename Traits>
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inline unsigned HashCountedSet<Value, HashFunctions, Traits>::size() const
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{
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return m_impl.size();
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}
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template<typename Value, typename HashFunctions, typename Traits>
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inline unsigned HashCountedSet<Value, HashFunctions, Traits>::capacity() const
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{
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return m_impl.capacity();
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}
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template<typename Value, typename HashFunctions, typename Traits>
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inline bool HashCountedSet<Value, HashFunctions, Traits>::isEmpty() const
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{
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return size() == 0;
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}
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template<typename Value, typename HashFunctions, typename Traits>
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inline typename HashCountedSet<Value, HashFunctions, Traits>::iterator HashCountedSet<Value, HashFunctions, Traits>::begin()
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{
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return m_impl.begin();
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}
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template<typename Value, typename HashFunctions, typename Traits>
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inline typename HashCountedSet<Value, HashFunctions, Traits>::iterator HashCountedSet<Value, HashFunctions, Traits>::end()
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{
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return m_impl.end();
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}
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template<typename Value, typename HashFunctions, typename Traits>
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inline typename HashCountedSet<Value, HashFunctions, Traits>::const_iterator HashCountedSet<Value, HashFunctions, Traits>::begin() const
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{
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return m_impl.begin();
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}
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template<typename Value, typename HashFunctions, typename Traits>
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inline typename HashCountedSet<Value, HashFunctions, Traits>::const_iterator HashCountedSet<Value, HashFunctions, Traits>::end() const
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{
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return m_impl.end();
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}
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template<typename Value, typename HashFunctions, typename Traits>
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inline typename HashCountedSet<Value, HashFunctions, Traits>::iterator HashCountedSet<Value, HashFunctions, Traits>::find(const ValueType& value)
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{
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return m_impl.find(value);
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}
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template<typename Value, typename HashFunctions, typename Traits>
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inline typename HashCountedSet<Value, HashFunctions, Traits>::const_iterator HashCountedSet<Value, HashFunctions, Traits>::find(const ValueType& value) const
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{
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return m_impl.find(value);
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}
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template<typename Value, typename HashFunctions, typename Traits>
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inline bool HashCountedSet<Value, HashFunctions, Traits>::contains(const ValueType& value) const
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{
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return m_impl.contains(value);
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}
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template<typename Value, typename HashFunctions, typename Traits>
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inline unsigned HashCountedSet<Value, HashFunctions, Traits>::count(const ValueType& value) const
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{
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return m_impl.get(value);
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}
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template<typename Value, typename HashFunctions, typename Traits>
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inline typename HashCountedSet<Value, HashFunctions, Traits>::AddResult HashCountedSet<Value, HashFunctions, Traits>::add(const ValueType &value)
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{
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AddResult result = m_impl.add(value, 0);
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++result.iterator->value;
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return result;
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}
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template<typename Value, typename HashFunctions, typename Traits>
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inline typename HashCountedSet<Value, HashFunctions, Traits>::AddResult HashCountedSet<Value, HashFunctions, Traits>::add(ValueType&& value)
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{
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AddResult result = m_impl.add(std::forward<Value>(value), 0);
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++result.iterator->value;
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return result;
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}
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template<typename Value, typename HashFunctions, typename Traits>
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inline typename HashCountedSet<Value, HashFunctions, Traits>::AddResult HashCountedSet<Value, HashFunctions, Traits>::add(const ValueType& value, unsigned count)
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{
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AddResult result = m_impl.add(value, 0);
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result.iterator->value += count;
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return result;
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}
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template<typename Value, typename HashFunctions, typename Traits>
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inline typename HashCountedSet<Value, HashFunctions, Traits>::AddResult HashCountedSet<Value, HashFunctions, Traits>::add(ValueType&& value, unsigned count)
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{
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AddResult result = m_impl.add(std::forward<Value>(value), 0);
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result.iterator->value += count;
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return result;
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}
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template<typename Value, typename HashFunctions, typename Traits>
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inline bool HashCountedSet<Value, HashFunctions, Traits>::remove(const ValueType& value)
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{
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return remove(find(value));
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}
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template<typename Value, typename HashFunctions, typename Traits>
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inline bool HashCountedSet<Value, HashFunctions, Traits>::remove(iterator it)
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{
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if (it == end())
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return false;
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unsigned oldVal = it->value;
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ASSERT(oldVal);
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unsigned newVal = oldVal - 1;
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if (newVal) {
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it->value = newVal;
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return false;
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}
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m_impl.remove(it);
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return true;
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}
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template<typename Value, typename HashFunctions, typename Traits>
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inline bool HashCountedSet<Value, HashFunctions, Traits>::removeAll(const ValueType& value)
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{
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return removeAll(find(value));
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}
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template<typename Value, typename HashFunctions, typename Traits>
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inline bool HashCountedSet<Value, HashFunctions, Traits>::removeAll(iterator it)
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{
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if (it == end())
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return false;
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m_impl.remove(it);
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return true;
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}
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template<typename Value, typename HashFunctions, typename Traits>
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inline void HashCountedSet<Value, HashFunctions, Traits>::clear()
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{
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m_impl.clear();
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}
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template<typename Value, typename HashFunctions, typename Traits, typename VectorType>
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inline void copyToVector(const HashCountedSet<Value, HashFunctions, Traits>& collection, VectorType& vector)
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{
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typedef typename HashCountedSet<Value, HashFunctions, Traits>::const_iterator iterator;
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vector.resize(collection.size());
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iterator it = collection.begin();
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iterator end = collection.end();
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for (unsigned i = 0; it != end; ++it, ++i)
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vector[i] = *it;
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}
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template<typename Value, typename HashFunctions, typename Traits>
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inline void copyToVector(const HashCountedSet<Value, HashFunctions, Traits>& collection, Vector<Value>& vector)
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{
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typedef typename HashCountedSet<Value, HashFunctions, Traits>::const_iterator iterator;
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vector.resize(collection.size());
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iterator it = collection.begin();
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iterator end = collection.end();
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for (unsigned i = 0; it != end; ++it, ++i)
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vector[i] = (*it).key;
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}
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template<typename Value, typename HashFunctions, typename Traits>
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template<typename V>
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inline auto HashCountedSet<Value, HashFunctions, Traits>::find(typename GetPtrHelper<V>::PtrType value) -> typename std::enable_if<IsSmartPtr<V>::value, iterator>::type
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{
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return m_impl.find(value);
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}
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template<typename Value, typename HashFunctions, typename Traits>
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template<typename V>
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inline auto HashCountedSet<Value, HashFunctions, Traits>::find(typename GetPtrHelper<V>::PtrType value) const -> typename std::enable_if<IsSmartPtr<V>::value, const_iterator>::type
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{
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return m_impl.find(value);
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}
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template<typename Value, typename HashFunctions, typename Traits>
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template<typename V>
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inline auto HashCountedSet<Value, HashFunctions, Traits>::contains(typename GetPtrHelper<V>::PtrType value) const -> typename std::enable_if<IsSmartPtr<V>::value, bool>::type
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{
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return m_impl.contains(value);
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}
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template<typename Value, typename HashFunctions, typename Traits>
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template<typename V>
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inline auto HashCountedSet<Value, HashFunctions, Traits>::count(typename GetPtrHelper<V>::PtrType value) const -> typename std::enable_if<IsSmartPtr<V>::value, unsigned>::type
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{
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return m_impl.get(value);
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}
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template<typename Value, typename HashFunctions, typename Traits>
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template<typename V>
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inline auto HashCountedSet<Value, HashFunctions, Traits>::remove(typename GetPtrHelper<V>::PtrType value) -> typename std::enable_if<IsSmartPtr<V>::value, bool>::type
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{
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return remove(find(value));
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}
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} // namespace WTF
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using WTF::HashCountedSet;
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#endif /* WTF_HashCountedSet_h */
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