[erlang-questions] Illegal Guard?
Sun Feb 14 00:37:08 CET 2016
> Why do you think "f(X, Y) when U = X+Y, U > 0 ; V = Y*X, V < 0 ->" is
Because the language specification and the compiler say it is.
I said that something like that creates problems in the same way
that case ?? of ?? -> U = X+Y ; ?? -> V = Y*X end
creates problems. It can be addressed the same way.
For what it's worth, I personally believe that allowing = in
guards would be an improvement to the language. It would
certainly make some guard macros easier to write.
> I do think that this is ugly, and diminishes the boundary between function
> body and function header, and leads to cluttered programs.
Leads? I'd say "can lead". A lot of things can lead to cluttered
But this is far from the most pressing issue in Erlang.
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