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https://github.com/ClickHouse/ClickHouse.git
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92 lines
2.0 KiB
C++
92 lines
2.0 KiB
C++
#include <iostream>
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#define DBMS_HASH_MAP_DEBUG_RESIZES
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#define DBMS_HASH_MAP_COUNT_COLLISIONS
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#include <string.h>
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#include <cstdlib>
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#include <utility>
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#include <DB/Core/Types.h>
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#include <DB/Common/Exception.h>
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#include <DB/IO/ReadHelpers.h>
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#include <DB/Core/StringRef.h>
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#include <DB/Common/HashTable/HashMap.h>
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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 HashMapWithDump : public HashMap<Key, Mapped, Hash, Grower, Allocator>
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{
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public:
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void dump() const
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{
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for (size_t i = 0; i < this->grower.bufSize(); ++i)
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{
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if (this->buf[i].isZero(*this))
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std::cerr << "[ ]";
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else
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std::cerr << '[' << this->buf[i].getValue().first.data << ", " << this->buf[i].getValue().second << ']';
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}
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std::cerr << std::endl;
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}
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};
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struct SimpleHash
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{
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size_t operator() (UInt64 x) const { return x; }
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size_t operator() (StringRef x) const { return DB::parse<UInt64>(x.data); }
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};
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struct Grower : public HashTableGrower<2>
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{
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void increaseSize()
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{
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++size_degree;
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}
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};
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int main(int argc, char ** argv)
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{
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typedef HashMapWithDump<
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StringRef,
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UInt64,
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SimpleHash,
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Grower,
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HashTableAllocatorWithStackMemory<4 * 24> > Map;
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Map map;
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map.dump();
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std::cerr << "size: " << map.size() << std::endl;
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map[StringRef("1", 1)] = 1;
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map.dump();
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std::cerr << "size: " << map.size() << std::endl;
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map[StringRef("9", 1)] = 1;
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map.dump();
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std::cerr << "size: " << map.size() << std::endl;
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std::cerr << "Collisions: " << map.getCollisions() << std::endl;
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map[StringRef("3", 1)] = 2;
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map.dump();
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std::cerr << "size: " << map.size() << std::endl;
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std::cerr << "Collisions: " << map.getCollisions() << std::endl;
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for (auto x : map)
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std::cerr << x.first.toString() << " -> " << x.second << std::endl;
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return 0;
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}
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