Re: Newbie query re notifications
Re: Newbie query re notifications
- Subject: Re: Newbie query re notifications
- From: Jean-Daniel Dupas <email@hidden>
- Date: Fri, 6 Mar 2009 22:14:12 +0100
Le 6 mars 09 à 21:25, Paul Sanders a écrit :
I'd suggest using:
-Wundeclared-selector
j o a r
Excellent. Thank you.
Of course you can put anything. Else how would you be able to
create a
method and a selector at runtime ?
So how does the compiler map any old string to a SEL (which is just a
number)? Is it some kind of hash (in which case how can you be sure
it is
unique) or is it something else? Inquiring minds want to know.
Conceptually:
It defined a selector reference:
SEL * _arbitrary_string_selector;
and then @selector(my_arbitrary_string) is replaced by
*_arbitrary_string_selector;
It also generates some data in the __OBJC segment of the binary to
tell the objc runtime to initialize the selector pointed by the
reference at load time.
@selector() is not considered as a constant value. You cannot use it
in static initialization for example (the compiler will report an
error).
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