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102 lines
2.5 KiB
C++
102 lines
2.5 KiB
C++
#pragma once
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#include <DB/Common/HashTable/Hash.h>
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#include <DB/Common/HashTable/HashTable.h>
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#include <DB/Common/HashTable/HashTableAllocator.h>
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#include <DB/IO/WriteBuffer.h>
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#include <DB/IO/WriteHelpers.h>
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#include <DB/IO/ReadBuffer.h>
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#include <DB/IO/ReadHelpers.h>
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#include <DB/IO/VarInt.h>
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/** NOTE HashSet could only be used for memmoveable (position independent) types.
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* Example: std::string is not position independent in libstdc++ with C++11 ABI or in libc++.
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* Also, key must be of type, that zero bytes is compared equals to zero key.
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*/
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template
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<
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typename Key,
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typename TCell,
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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 HashSetTable : public HashTable<Key, TCell, Hash, Grower, Allocator>
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{
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public:
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using Self = HashSetTable<Key, TCell, Hash, Grower, Allocator>;
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using Cell = TCell;
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void merge(const Self & rhs)
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{
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if (!this->hasZero() && rhs.hasZero())
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{
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this->setHasZero();
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++this->m_size;
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}
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for (size_t i = 0; i < rhs.grower.bufSize(); ++i)
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if (!rhs.buf[i].isZero(*this))
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this->insert(Cell::getKey(rhs.buf[i].getValue()));
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}
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void readAndMerge(DB::ReadBuffer & rb)
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{
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Cell::State::read(rb);
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size_t new_size = 0;
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DB::readVarUInt(new_size, rb);
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this->resize(new_size);
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for (size_t i = 0; i < new_size; ++i)
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{
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Cell x;
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x.read(rb);
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this->insert(Cell::getKey(x.getValue()));
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}
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}
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};
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template <typename Key, typename Hash, typename TState = HashTableNoState>
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struct HashSetCellWithSavedHash : public HashTableCell<Key, Hash, TState>
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{
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using Base = HashTableCell<Key, Hash, TState>;
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size_t saved_hash;
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HashSetCellWithSavedHash() : Base() {}
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HashSetCellWithSavedHash(const Key & key_, const typename Base::State & state) : Base(key_, state) {}
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bool keyEquals(const Key & key_) const { return this->key == key_; }
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bool keyEquals(const Key & key_, size_t hash_) const { return saved_hash == hash_ && this->key == key_; }
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void setHash(size_t hash_value) { saved_hash = hash_value; }
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size_t getHash(const Hash & hash) const { return saved_hash; }
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};
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template
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<
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typename Key,
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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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using HashSet = HashSetTable<Key, HashTableCell<Key, Hash>, Hash, Grower, Allocator>;
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template
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<
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typename Key,
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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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using HashSetWithSavedHash = HashSetTable<Key, HashSetCellWithSavedHash<Key, Hash>, Hash, Grower, Allocator>;
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