Re: (RS)What's the type of a selector?[3]
Re: (RS)What's the type of a selector?[3]
- Subject: Re: (RS)What's the type of a selector?[3]
- From: Chris Suter <email@hidden>
- Date: Sat, 28 Oct 2006 14:15:18 +1000
Hi,
I just wrote an apology to Roland off-list.
I didn't realise that you could cast SEL's to char * but from reading
the docs. it appears you can. It was probably originally intended
that objc_selector be an opaque type but given it's now documented
that you can cast to char *, it's very unlikely it will change.
Looks like I should go read some books. :-)
- Chris
On 28/10/2006, at 2:11 PM, Klaus Backert wrote:
Am 28.10.2006 um 05:05 schrieb Roland Silver:
On Oct 27, 2006, at 8:30 PM, Chris Suter wrote:
Hi,
Looks like you should read some C books.
It's a pointer to an structure.
It's not a char * and NSLog ("%s", @selector (foo)) will not work
as someone suggested earlier.
Either use %p for a pointer or use %s with sel_getName or use %@
and NSStringFromSelector.
This is all in the documentation and you really don't need us to
help you.
- Chris
Well, Chris...
Aaron Hillegass writes in the 2nd Edition of his Cocoa Programming
for Mac OS X in Chapter 3 "Objective-C / For the More Curious: How
Does Messageing Work?", p78f:
"The selector is of type SEL. Although, SEL is actually defined to
be char * ...".
With Cmd-doubleclick on any SEL in Xcode I find immediately:
typedef struct objc-selector *SEL
in the header objc.h
There is a little bit more info in the Objective-C runtime reference.
Cheers.
Klaus
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