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>
52 lines
1.4 KiB
C++
52 lines
1.4 KiB
C++
/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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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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#include "utils/human_readable.hh"
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#include <array>
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#include <ostream>
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namespace utils {
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static human_readable_value to_human_readable_value(uint64_t value, uint64_t step, uint64_t precision, const std::array<char, 5>& suffixes) {
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if (!value) {
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return {0, suffixes[0]};
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}
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uint64_t result = value;
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uint64_t remainder = 0;
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unsigned i = 0;
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// If there is no remainder we go below precision because we don't loose any.
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while (((!remainder && result >= step) || result >= precision)) {
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remainder = result % step;
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result /= step;
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if (i == suffixes.size()) {
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break;
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} else {
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++i;
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}
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}
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return {uint16_t(remainder < (step / 2) ? result : result + 1), suffixes[i]};
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}
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human_readable_value to_hr_size(uint64_t size) {
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const std::array<char, 5> suffixes = {'B', 'K', 'M', 'G', 'T'};
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return to_human_readable_value(size, 1024, 8192, suffixes);
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}
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} // namespace utils
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auto fmt::formatter<utils::human_readable_value>::format(const utils::human_readable_value& val, fmt::format_context& ctx) const
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-> decltype(ctx.out()) {
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auto out = fmt::format_to(ctx.out(), "{}", val.value);
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if (val.suffix) {
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out = fmt::format_to(out, "{}", val.suffix);
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}
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return out;
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}
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