First of all, hi to everybody. This is my first time posting to this list, and as the nettiquette rules says I introduce myself.

I'm��a student from the Universidad Nacional de Quilmes, in Quilmes, Buenos Aires, Argentina. So I beg for you to��apologize��my bad��English. I'm currently the teachers assistent at Tecnicas Avanzadas de Programacion (Object Oriented Programming)
Well, that's pretty much it.

Second of all I would like to thank and congratulate the team behind Pharo. It's by far my favorite Smalltalk environment,��although��I miss some features from VisualWorks (Future��discussion��maybe :-) )

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Now, to my problem.

While I was thinking on an exercise to give to the students I though about developing a three-valued logic, creating the TTrue, TFalse, and TUnknown, whos instances understood some methods such as #ifTrue: #ifFalse: and so on.

My surprise came when I discovered that the ifTrue: method only work for the True and False instances of Smalltalk, being unable to define a method named ifTrue:

For what I saw the problem is that, on non boolean receivers, the method is not even evaluated to see if the receiver can understand it, but it automatically triggers the message #mustBeBoolean

So my question is, why does it do this? Is there a way to use ifTrue: really as a method?

Is there a way that I can make ifTrue: to work with any Class and not just Booleans?

Thanks in advance.

--��

Alan Rodas Bonjour