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51 lines
1.2 KiB
C++
51 lines
1.2 KiB
C++
#pragma once
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#include <DB/Common/HashTable/HashMap.h>
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#include <DB/Common/HashTable/ClearableHashSet.h>
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template <typename Key, typename Mapped, typename Hash>
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struct ClearableHashMapCell : public ClearableHashTableCell<Key, HashMapCell<Key, Mapped, Hash, ClearableHashSetState>>
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{
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using Base = ClearableHashTableCell<Key, HashMapCell<Key, Mapped, Hash, ClearableHashSetState>>;
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using Base::Base;
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ClearableHashMapCell(const typename Base::value_type & value_, const typename Base::State & state)
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: Base::BaseCell(value_, state), Base::version(state.version) {}
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};
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template
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<
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typename Key,
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typename Mapped,
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typename Hash = DefaultHash<Key>,
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typename Grower = HashTableGrower<>,
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typename Allocator = HashTableAllocator
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>
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class ClearableHashMap : public HashTable<Key, ClearableHashMapCell<Key, Mapped, Hash>, Hash, Grower, Allocator>
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{
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public:
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using key_type = Key;
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using mapped_type = Mapped;
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using value_type = typename ClearableHashMap::cell_type::value_type;
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mapped_type & operator[](Key x)
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{
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typename ClearableHashMap::iterator it;
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bool inserted;
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this->emplace(x, it, inserted);
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if (inserted)
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new(&it->second) mapped_type();
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return it->second;
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}
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void clear()
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{
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++this->version;
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this->m_size = 0;
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}
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};
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