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49 rivejä
1.0 KiB
49 rivejä
1.0 KiB
#pragma once
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#include <stdint.h>
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#include <atomic>
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#include <gp/array.hpp>
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#include <gp/algorithm/tmp_manip.hpp>
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namespace gp {
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template<typename hash_type = uint64_t, uint8_t magnitude = 19, bool threading = false>
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class bloomfilter {
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constexpr static size_t phys_size = (1 << magnitude) / 32;
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gp::array<
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typename gp::either< threading,
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std::atomic_uint32_t,
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uint32_t
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>::type,
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phys_size
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> data;
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template<typename T>
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static void set_bit(T* value, const int v_pos) {
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*value |= (1 << v_pos);
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}
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template<typename T>
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static bool get_bit(T* value, const int v_pos) {
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return (*value >> v_pos) & 1;
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}
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public:
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void set_hash(hash_type v)
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{
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const size_t modulo = v & ((1 << magnitude)-1);
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const size_t p_pos = modulo / 32;
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const size_t v_pos = modulo % 32;
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set_bit(&data[p_pos], v_pos);
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}
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bool test_hash(hash_type v)
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{
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const size_t modulo = v & ((1 << magnitude)-1);
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const size_t p_pos = modulo / 32;
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const size_t v_pos = modulo % 32;
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return get_bit(&data[p_pos], v_pos);
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}
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};
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}
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