2011/6/13 Stephan Houben <steph...@planet.nl>:
> [...]
> I have code like this which dispatches on
> the type of a homogenous vector:
> [...]
> I was wondering if there is a more efficient way to
> do this, one which doesn't involve a linear scan
> over all possible types. I presume that at the C level
> there is a "type tag" associated with any of these types;
> is it possible to access this from the Racket level?
> [...]
Hello Stephan,
since everything can be interpreted as a structure in Racket, one
thing you could do is dispatch on the name of structure types:
(define (identify v)
(case (vector-ref (struct->vector v) 0)
((struct:byte-string) "bytes")
((struct:u16vector) "small words")
(else "whatever")))
However, whether this will really result in a performance gain I don't
know.
Ciao,
Thomas
--
When C++ is your hammer, every problem looks like your thumb.
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