ClickHouse/base/common/unit.h

#pragma once
#include <cstddef>

constexpr size_t KiB = 1024;
constexpr size_t MiB = 1024 * KiB;
constexpr size_t GiB = 1024 * MiB;

constexpr size_t operator"" _KiB(unsigned long long val) { return val * KiB; }
constexpr size_t operator"" _MiB(unsigned long long val) { return val * MiB; }
constexpr size_t operator"" _GiB(unsigned long long val) { return val * GiB; }