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70 lines
1.7 KiB
C++
70 lines
1.7 KiB
C++
// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
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// Distributed under the MIT License (http://opensource.org/licenses/MIT)
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#pragma once
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#include <spdlog/fmt/fmt.h>
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#include <chrono>
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// Stopwatch support for spdlog (using std::chrono::steady_clock).
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// Displays elapsed seconds since construction as double.
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//
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// Usage:
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//
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// spdlog::stopwatch sw;
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// ...
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// spdlog::debug("Elapsed: {} seconds", sw); => "Elapsed 0.005116733 seconds"
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// spdlog::info("Elapsed: {:.6} seconds", sw); => "Elapsed 0.005163 seconds"
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//
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//
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// If other units are needed (e.g. millis instead of double), include "fmt/chrono.h" and use "duration_cast<..>(sw.elapsed())":
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//
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// #include <spdlog/fmt/chrono.h>
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//..
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// using std::chrono::duration_cast;
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// using std::chrono::milliseconds;
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// spdlog::info("Elapsed {}", duration_cast<milliseconds>(sw.elapsed())); => "Elapsed 5ms"
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namespace spdlog {
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class stopwatch
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{
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using clock = std::chrono::steady_clock;
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std::chrono::time_point<clock> start_tp_;
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public:
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stopwatch()
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: start_tp_{clock::now()}
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{}
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std::chrono::duration<double> elapsed() const
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{
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return std::chrono::duration<double>(clock::now() - start_tp_);
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}
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void reset()
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{
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start_tp_ = clock::now();
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}
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};
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} // namespace spdlog
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// Support for fmt formatting (e.g. "{:012.9}" or just "{}")
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namespace
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#ifdef SPDLOG_USE_STD_FORMAT
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std
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#else
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fmt
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#endif
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{
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template<>
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struct formatter<spdlog::stopwatch> : formatter<double>
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{
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template<typename FormatContext>
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auto format(const spdlog::stopwatch &sw, FormatContext &ctx) const -> decltype(ctx.out())
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{
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return formatter<double>::format(sw.elapsed().count(), ctx);
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}
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};
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} // namespace std
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