57 lines
1.3 KiB
C++
57 lines
1.3 KiB
C++
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#ifndef HASH_TABLE_H
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#define HASH_TABLE_H
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#include "hashed_string.hpp"
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#include <stdint.h>
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struct Hash_function {
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private:
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uint64_t * seed;
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uint64_t(* hash_function)(const My_string *, const uint64_t *, uint64_t *, size_t);
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size_t l;
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uint64_t * x;
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public:
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Hash_function(uint64_t * seed, uint64_t(* hash_function)(const My_string *, const uint64_t *, uint64_t *, size_t), size_t l, size_t D) {
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this->seed = seed;
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this->hash_function = hash_function;
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this->l = l;
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this->x = new uint64_t[D];
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}
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~Hash_function() {
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delete[] x;
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}
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size_t get_m() {
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return 1 << l;
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}
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uint64_t hash(const My_string * string) {
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return hash_function(string, seed, x, l);
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}
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};
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struct Hash_table {
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private:
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Hash_function * hash_function;
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Hashed_string * words;
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size_t distinct_words = 0;
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size_t m;
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public:
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Hash_table(Hash_function * hash_function);
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~Hash_table();
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size_t get_distict_words();
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void hash(My_string * word);
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void hash(Hashed_string * hs);
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void rehash(Hash_function * hash_function);
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int is_time_for_rehash() {return distinct_words >= m;}
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};
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#endif
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