Print Page - Lutz - feature request

Title: Lutz - feature request
Post by: Jeff on May 30, 2008, 06:56:57 AM

Lutz,

Can we have a built-in function to give us the type of a value? Using cond with various predicates is *really* slow. Then we can do nice things like building type-case macros.

Thanks,

Jeff

Title:
Post by: newBert on May 30, 2008, 08:19:25 AM

Does this simple function (without 'cond' and predicates) would not be sufficient?

Code Select Expand
(define (type x)
  ; returns the type of data
  (let (types '("boolean" "boolean" "integer" "float" 
                "string" "symbol" "context"
                "primitive" "primitive" "primitive" 
                "quote" "list" "lambda" "macro" "array"))
       (types (& 0xf ((dump x) 1)))))

I don't know any more where I found it...

Title:
Post by: Jeff on May 30, 2008, 10:04:04 AM

That works wonderfully. Thank you!

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Forum => Anything else we might add? => Topic started by: Jeff on May 30, 2008, 06:56:57 AM