[mercury-users] false function

Ralph Becket rafe at cs.mu.OZ.AU
Wed Jul 30 11:04:30 AEST 2003

Michael Day, Wednesday, 30 July 2003:
> A better name, then? A value that cannot be computed? nonexistent?  
> nothing? priceless? worthless?

I understand what the function would be used for, I'm just not convinced
the situation arises frequently enough to justify adding something to
the library.

It's not much harder to write your function as

f(X) = Y :-
	     if bar(X) then Y = ...
	else if baz(Z) then Y = ...
	else                false.

-- Ralph
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