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#ifndef UTILS_TIMER_H
#define UTILS_TIMER_H
#include <cstdint>
#include <ctime>
namespace timer {
/// A minimal Linux watch clock.
struct timer {
constexpr timer() = default;
void start() {
clock_gettime(kClock, &m_start);
}
void stop() {
timespec end;
clock_gettime(kClock, &end);
m_nanos += ((end.tv_sec - m_start.tv_sec) * 1000000000ull) +
(end.tv_nsec - m_start.tv_nsec);
}
constexpr void reset() {
m_nanos = 0;
}
constexpr double as_sec() const {
return as_msec() / 1000.0;
}
constexpr double as_msec() const {
return as_usec() / 1000.0;
}
constexpr double as_usec() const {
return static_cast<double>(m_nanos) / 1000.0;
}
private:
static constexpr clockid_t kClock = CLOCK_MONOTONIC_RAW;
timespec m_start{};
std::uint64_t m_nanos{0};
};
/// A scoped timer to automatically start / stop a watch clock in the scope the
/// scoped_timer lives.
struct scoped_timer {
explicit scoped_timer(timer& t) : m_timer(t) {
m_timer.start();
}
~scoped_timer() {
m_timer.stop();
}
scoped_timer(const scoped_timer&) = delete;
scoped_timer& operator=(const scoped_timer&) = delete;
scoped_timer(scoped_timer&&) = delete;
scoped_timer& operator=(scoped_timer&&) = delete;
private:
timer& m_timer;
};
} // namespace timer
#endif
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