Metronome: Difference between revisions

=={{header|C++}}==

This example has a timing loop to ensure that its timing is reliable in the long term.

<syntaxhighlight lang="c++">

#include <chrono>

#include <cstdint>

#include <iostream>

#include <thread>

class Metronome {

public:

Metronome(const double& aBeats_per_minute, const int32_t& aMeasure, const int32_t aDuration_in_minutes)

: beats_per_minute(aBeats_per_minute), measure(aMeasure), duration(aDuration_in_minutes) {

counter = 0;

}

void start() {

while ( counter < duration * beats_per_minute ) {

start_time = std::chrono::system_clock::now();

std::this_thread::sleep_until(time_to_awake());

counter++;

if ( counter % measure != 0 ) {

std::cout << "Tick " << std::flush;

} else {

std::cout << "Tock" << std::endl;

}

}

}

private:

std::chrono::system_clock::time_point time_to_awake() const {

return start_time + std::chrono::seconds(1);

}

std::chrono::system_clock::time_point start_time;

int32_t counter;

const double beats_per_minute;

const int32_t measure, duration;

};

int main() {

Metronome metronome(60, 4, 1);

metronome.start();

}

</syntaxhighlight>

{{ out }}

<pre>

Tick Tick Tick Tock

Tick Tick Tick Tock

Tick Tick

// continues for the requested duration

</pre>