9300d7b80b
before this change, we rely on the default-generated fmt::formatter created from operator<<, but fmt v10 dropped the default-generated formatter. in this change, we define formatters for `utils::human_readable_value`, and drop its operator<< Refs #13245 Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>
43 lines
1.1 KiB
C++
43 lines
1.1 KiB
C++
/*
|
|
* SPDX-License-Identifier: AGPL-3.0-or-later
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2020-present ScyllaDB
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <cstdint>
|
|
#include <fmt/core.h>
|
|
|
|
namespace utils {
|
|
|
|
struct human_readable_value {
|
|
uint16_t value; // [0, 1024)
|
|
char suffix; // 0 -> no suffix
|
|
};
|
|
|
|
/// Convert a size to a human readable representation.
|
|
///
|
|
/// The human-readable representation has at most 4 digits
|
|
/// and a letter appropriate to the power of two the number has to be multiplied
|
|
/// with to arrive to the original number (with some loss of precision).
|
|
/// The different powers of two are the conventional 2 ** (N * 10) variants:
|
|
/// * N=0: (B)ytes
|
|
/// * N=1: (K)bytes
|
|
/// * N=2: (M)bytes
|
|
/// * N=3: (G)bytes
|
|
/// * N=4: (T)bytes
|
|
///
|
|
/// Examples:
|
|
/// * 87665 will be converted to 87K
|
|
/// * 1024 will be converted to 1K
|
|
human_readable_value to_hr_size(uint64_t size);
|
|
|
|
} // namespace utils
|
|
|
|
template <> struct fmt::formatter<utils::human_readable_value> : fmt::formatter<std::string_view> {
|
|
auto format(const utils::human_readable_value&, fmt::format_context& ctx) const -> decltype(ctx.out());
|
|
};
|