Re: Using "IMP" to speed up loops?
Re: Using "IMP" to speed up loops?
- Subject: Re: Using "IMP" to speed up loops?
- From: Ondra Cada <email@hidden>
- Date: Sun, 10 Nov 2002 20:09:13 +0100
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@hidden
http://www.ocs.cz
private email@hidden
http://www.ocs.cz/oc
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