Files
scylladb/cache_temperature.hh
Avi Kivity fcb8d040e8 treewide: use Software Package Data Exchange (SPDX) license identifiers
Instead of lengthy blurbs, switch to single-line, machine-readable
standardized (https://spdx.dev) license identifiers. The Linux kernel
switched long ago, so there is strong precedent.

Three cases are handled: AGPL-only, Apache-only, and dual licensed.
For the latter case, I chose (AGPL-3.0-or-later and Apache-2.0),
reasoning that our changes are extensive enough to apply our license.

The changes we applied mechanically with a script, except to
licenses/README.md.

Closes #9937
2022-01-18 12:15:18 +01:00

33 lines
692 B
C++

/*
* Copyright 2018-present ScyllaDB
*/
/*
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
#pragma once
#include <stdint.h>
namespace ser {
template <typename T>
class serializer;
};
class cache_temperature {
float hit_rate;
explicit cache_temperature(uint8_t hr) : hit_rate(hr/255.0f) {}
public:
uint8_t get_serialized_temperature() const {
return hit_rate * 255;
}
cache_temperature() : hit_rate(0) {}
explicit cache_temperature(float hr) : hit_rate(hr) {}
explicit operator float() const { return hit_rate; }
static cache_temperature invalid() { return cache_temperature(-1.0f); }
friend struct ser::serializer<cache_temperature>;
};