2014-03-17 02:01:03 +00:00
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#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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template <typename Key, typename Mapped, typename Hash>
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struct HashMapCell
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{
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typedef std::pair<Key, Mapped> value_type;
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value_type value;
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HashMapCell(const Key & key_) : value(key_, Mapped()) {}
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HashMapCell(const value_type & value_) : value(value_) {}
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value_type & getValue() { return value; }
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const value_type & getValue() const { return value; }
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static Key & getKey(value_type & value) { return value.first; }
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static const Key & getKey(const value_type & value) { return value.first; }
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bool keyEquals(const Key & key_) const { return value.first == key_; }
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bool keyEquals(const HashMapCell & other) const { return value.first == other.value.first; }
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void setHash(size_t hash_value) {}
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size_t getHash(const Hash & hash) const { return hash(value.first); }
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static bool isZero(const Key & key) { return key == 0; }
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bool isZero() const { return isZero(value.first); }
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void setZero() { value.first = 0; }
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void setMapped(const value_type & value_) { value.second = value_.second; }
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/// Сериализация, в бинарном и текстовом виде.
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void write(DB::WriteBuffer & wb) const
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{
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DB::writeBinary(value.first, wb);
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DB::writeBinary(value.second, wb);
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}
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void writeText(DB::WriteBuffer & wb) const
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{
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2014-03-17 02:06:26 +00:00
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DB::writeDoubleQuoted(value.first, wb);
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DB::writeChar(',', wb);
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DB::writeDoubleQuoted(value.second, wb);
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2014-03-17 02:01:03 +00:00
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}
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/// Десериализация, в бинарном и текстовом виде.
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void read(DB::ReadBuffer & rb)
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{
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DB::readBinary(value.first, rb);
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DB::readBinary(value.second, rb);
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}
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void readText(DB::ReadBuffer & rb)
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{
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2014-03-17 02:06:26 +00:00
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DB::readDoubleQuoted(value.first, rb);
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DB::assertString(",", rb);
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DB::readDoubleQuoted(value.second, rb);
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2014-03-17 02:01:03 +00:00
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}
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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 HashMap : public HashTable<Key, HashMapCell<Key, Mapped, Hash>, Hash, Grower, Allocator>
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{
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public:
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typedef Key key_type;
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typedef Mapped mapped_type;
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typedef HashMapCell<Key, Mapped, Hash> value_type;
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Mapped & operator[](Key x)
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{
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typename HashMap::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();
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return it->second;
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}
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};
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