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43 lines
1.1 KiB
C++
43 lines
1.1 KiB
C++
/*
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* SPDX-License-Identifier: LicenseRef-ScyllaDB-Source-Available-1.1
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*/
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/*
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* Copyright (C) 2020-present ScyllaDB
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*/
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#pragma once
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#include <cstdint>
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#include <fmt/core.h>
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namespace utils {
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struct human_readable_value {
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uint16_t value; // [0, 1024)
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char suffix; // 0 -> no suffix
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};
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/// Convert a size to a human readable representation.
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///
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/// The human-readable representation has at most 4 digits
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/// and a letter appropriate to the power of two the number has to be multiplied
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/// with to arrive to the original number (with some loss of precision).
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/// The different powers of two are the conventional 2 ** (N * 10) variants:
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/// * N=0: (B)ytes
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/// * N=1: (K)bytes
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/// * N=2: (M)bytes
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/// * N=3: (G)bytes
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/// * N=4: (T)bytes
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///
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/// Examples:
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/// * 87665 will be converted to 87K
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/// * 1024 will be converted to 1K
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human_readable_value to_hr_size(uint64_t size);
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} // namespace utils
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template <> struct fmt::formatter<utils::human_readable_value> : fmt::formatter<string_view> {
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auto format(const utils::human_readable_value&, fmt::format_context& ctx) const -> decltype(ctx.out());
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};
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