timer

`timer` calls a callback repeatedly from a timer thread.

The callback receives one argument: the timer call count. The first callback receives `1`.

Creates a timer object using a callable object.

Arguments:

function OnTimer(count)
{
    print('timer ', count);
}
 
t = timer(OnTimer);

Starts the timer and returns `true` on success.

Arguments:

t = timer(OnTimer);
t.start(1000);

Starts the timer with a repeat count and returns `true` on success.

Arguments:

t = timer(OnTimer);
t.start(500, 3);     // call OnTimer three times

Stops the timer and returns `true` if it was running.

t.stop();

Returns `true` while the timer is running.

if (t.is_running())
{
    print('timer is active');
}

Returns a short text summary of timer methods.

If the callback raises an error, the timer prints a timer callback error message and stops.

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