=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.15.2

Copyright (c) 1998-2003 Paulo Moura.  All Rights Reserved.
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%% message_counter example


% choose an object to spy:

| ?- message_counter::set_spy_point(_, list, _, _).
yes


% activate the monitor:

| ?- message_counter::activate_monitor.
yes


% send some messages to the spied object; get all the answers for ancestor/1:

| ?- list::empty([]).
yes

| ?- list::member(X, [1, 2, 3]).
X = 1 ? ;
X = 2 ? ;
X = 3 ? ;
no


% print a report of the data collected by the monitor:

| ?- message_counter::report.
list
  total of calls: 2
  total of exits: 4

  empty/1
    calls: 1
    exits: 1

  member/2
    calls: 1
    exits: 3

yes


% stop and reset the message counter monitor:

| ?- message_counter::stop.
yes



%% stop_watch example


% choose a pair object/message to spy:

| ?- stop_watch::set_spy_point(_, list, length(_, _), _).
yes


% activate the monitor:

| ?- stop_watch::activate_monitor.
yes


% send a message to the spied object:

| ?- list::length([1, 2, 3], Length).
list <-- length([1,2,3],_277) from user
STARTING at 755.75999999999999 seconds
list <-- length([1,2,3],3) from user
ENDING at 755.69000000000005 seconds

Length = 3

yes


% clean up:

| ?- stop_watch::reset_monitor.
yes



%% timer example


% try a message 1000 times and return the average time:

| ?- timer::timer(list::length([1, 2, 3], _), 1000, Time).
Time = 0.00008

yes