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Logtalk - Object oriented extension to Prolog
Release 2.24.0

Copyright (c) 1998-2005 Paulo Moura.  All Rights Reserved.
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% start by loading the example:

| ?- logtalk_load(msglog(loader)).
...


% assume that all library entities have been loaded...

% start recording user messages:

| ?- msglog::record.

yes

% send some messages:

| ?- list::member(X, [1, 2, 3]).

X = 1 ;
X = 2 ;
X = 3 ;
no

| ?- character::is_alpha(p).

yes

| ?- integer::between(1, 4, N).

N = 1 ;
N = 2 ;
N = 3 ;
N = 4 ;
no

% stop recording and print message log:

| ?- msglog::(stop, print).

list::member(X, [1, 2, 3]).
character::is_alpha(p).
integer::between(1, 4, N).

yes