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Type casting boolean?

markbeck

I'm trying to type cast a variable as boolean, but I keep getting some wierd error when I try to use it.

For example I've got the following code:

(defmacro mytest (foo "b") foo) 

If I try to execute: foo(t) I get the following error:

*Error* mytest: argument #1 should be ddUserType (type template = "b") - t

From what I understand, ddUserType is a boolean.  

Where did I mess up?

Mark

  • Mark,

    Three things:

    1. "b" does not mean "boolean". It means a "dd" object. Hence passing a t will fail the type check, because it is not a dd object (as returned by ddGetId()).

    2. There is no boolean type in SKILL. So there is no type checking letter for it. In SKILL, nil means false (and nil is an empty list, so is an "l" type), and anything else means true.

    3. The string at the end of the formal parameter list is for type _checking_ not type _casting_.

    Regards,

    Andrew

  • Sorry I mis-typed, I meant to askabout type checking, not type casting.

    Thanks for the info.  I guess I'll just have to check the variable internally

    Mark

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