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yap-6.3/Logtalk/examples/operators/SCRIPT.txt
pmoura e75e406f84 Logtalk 2.29.2 files.
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1773 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
2007-01-10 12:46:10 +00:00

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=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.29.2
Copyright (c) 1998-2007 Paulo Moura. All Rights Reserved.
=================================================================
% start by loading the example:
| ?- logtalk_load(operators(loader)).
...
% operators declared inside an object are not visible outside:
| ?- double::(I double J).
Syntax error: Operator expected
% you must use instead functor notation:
| ?- double::double(I, J).
I = 1
J = 2 ;
I = 2
J = 4 ;
I = 3
J = 6
Yes
% operators also affect inputing of terms, enabling this example to work:
| ?- triple::triple(I, J).
I = 1
J = 3 ;
I = 2
J = 6 ;
I = 3
J = 9
Yes
% check the file "previous.txt" generated from the file "next.txt" by the object "reverse"
% by opening the files on a text editor