Re: Using "IMP" to speed up loops?

FROM : Ondra Cada
DATE : Sun Nov 10 20:09:13 2002

On Sunday, November 10, 2002, at 05:20 , Ken Tozier wrote:

> I was reading up on how to use IMP in the NSObject documentation in
> order to speed up some of my loops, but the examples don't look right.

They do.

> The documentation suggested declaring IMP's like this:
> ...
> And using them like this:
>
>     while ( !test(target, @selector(isEqual:), someObject) )
...
> But given that the initialization line:
>
>     test = (EqualIMP)[target methodForSelector:@selector(isEqual:)];
>
> already encapsulates "id" and "SEL" from the prototype,

It does not. It just uses an id and SEL to find the implementation, which
is a plain function pointer. So far as the function's first argument is an
id and second a SEL, you have to provide them. That's all.

> I would have
> expected it to be used like:
>
>     while ( !test(someObject) )
>             ...
>
> What's the scoop?

I guess you are looking for a complexity which does not exist. IMP is just
a pointer, but for the function adress it encapsulates *nothing*.
---
Ondra Cada
OCSoftware:    <email_removed>              http://www.ocs.cz
private        <email_removed>            http://www.ocs.cz/oc
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