持續時間來自 std.datetime 的 UFCS

import core.thread, std.stdio, std.datetime;

void some_operation() {
    // Sleep for two sixtieths (2/60) of a second.
    Thread.sleep(2.seconds / 60);
    // Sleep for 100 microseconds.
    Thread.sleep(100.usecs);
}

void main() {
    MonoTime t0 = MonoTime.currTime();
    some_operation();
    MonoTime t1 = MonoTime.currTime();
    Duration time_taken = t1 - t0;

    writeln("You can do some_operation() this many times per second: ",
            1.seconds / time_taken);
}