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[?] Define a function that operates on patterns?

Pavel Perikov
Posted 7 years ago

Hello everybody.

I'm trying to define a function that accepts a pattern as a parameter. After playing with HoldPattern and HoldAll attributes I'm out of ideas.

Is this at all possible? Here's an example of what I'd like to get:

Remove[f];
f[HoldPattern[Blank[Real]]] := 0; 
f[a_] := 1; SetAttributes[f, HoldFirst];
f[_Real] (* expecting to get 0 *)

Pure function will receive a pattern as expected.

Any ideas are welcome.
POSTED BY: Pavel Perikov
4 Replies
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How about Verbatim?

Clear[f];
f[Verbatim[_Real]] := 0;
f[_] := 1;
{f[_Integer] (*1*), f[_Real] (*0*)}
POSTED BY: Gerli Jõgeva
Pavel Perikov
Pavel Perikov
Posted 7 years ago

Exactly! This is THE solution. Thank you!
POSTED BY: Pavel Perikov
POSTED BY: Claudio Chaib
Pavel Perikov
Pavel Perikov
Posted 7 years ago

Thanks! Playing with those now.
POSTED BY: Pavel Perikov
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