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#pragma once
#include <util/system/types.h>
#include <util/generic/strbuf.h>
namespace NKikimr {
class TCountMinSketch {
private:
ui64 Width_;
ui64 Depth_;
ui64 ElementCount_;
private:
static ui64 Hash(const char* data, size_t size, size_t hashIndex);
static size_t StaticSize(ui64 width, ui64 depth) {
return sizeof(TCountMinSketch) + width * depth * sizeof(ui32);
}
const ui32* Buckets() const {
return reinterpret_cast<const ui32*>(this + 1);
}
ui32* Buckets() {
return reinterpret_cast<ui32*>(this + 1);
}
public:
static TCountMinSketch* Create(ui64 width = 256, ui64 depth = 8);
static TCountMinSketch* FromString(const char* data, size_t size);
void operator delete(void* data) noexcept;
TCountMinSketch() = delete;
TCountMinSketch(const TCountMinSketch&) = delete;
size_t GetSize() const {
return StaticSize(Width_, Depth_);
}
size_t GetWidth() const {
return Width_;
}
size_t GetDepth() const {
return Depth_;
}
size_t GetElementCount() const {
return ElementCount_;
}
TStringBuf AsStringBuf() const {
return TStringBuf(reinterpret_cast<const char*>(this), GetSize());
}
void Count(const char* data, size_t size);
ui32 Probe(const char* data, size_t size) const;
TCountMinSketch& operator+=(const TCountMinSketch& rhs);
};
static_assert(sizeof(TCountMinSketch) == 24);
} // NKikimr
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