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yap-6.3/Logtalk/examples/profiling/stop_watch.lgt

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:- object(stop_watch,
implements(event_handlersp),
imports(monitor)).
:- info([
version is 1.0,
authors is 'Paulo Moura',
date is 1998/3/23,
comment is 'Message executing time monitor.']).
:- uses(time).
before(Object, Message, Sender) :-
write(Object), write(' <-- '), writeq(Message),
write(' from '), write(Sender), nl, write('STARTING at '),
time::cpu_time(Seconds), write(Seconds), write(' seconds'), nl.
after(Object, Message, Sender) :-
write(Object), write(' <-- '), writeq(Message),
write(' from '), write(Sender), nl, write('ENDING at '),
time::cpu_time(Seconds), write(Seconds), write(' seconds'), nl.
:- end_object.