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From: Carsten Lucke Date: Sun Apr 27 13:12:05 2008 Subject: Re: Method signature hackery - lsit of type signatures?
Hey Wez, that was quick! :-) Thank you! These defines were exactly what I was looking for. I thought it had to be somewhere in the ObjC runtime but I didn't find it anywhere in the docs. Next time I'll stick to the header-files in the first place. ;-) Thanks again! Keep up the great work. Regards, - Carsten Wez Furlong wrote: > Hi Carsten, > > Signatures are not very well documented, at least, not well enoough for > a casual google to yield a guide. > /usr/include/objc/runtime.h has a set of defines like this: > > #define _C_ID '@' > #define _C_CLASS '#' > #define _C_SEL ':' > #define _C_CHR 'c' > #define _C_UCHR 'C' > /* and more */ > > so the signature you mentioned: c@: means: > > return type: c (the "char" type) > first param: @ (the "id" type, which is a pointer to an obj-c object) > second param: : (the "selector" type, which identifies the method to be > invoked) > > the first and second parameters are almost always present; they're the > implicit "this" and method name. > > Regarding when you need it... if you're working with classes defined by > the objective C runtime, we can usually query it to work out the > signature automatically. The delegate example needs you to hint at the > signature, because the class is purely defined by PHP based on the > method you've declared. Since PHP is dynamically typed, it's not always > possible to infer the correct signature based on the method declaration, > and more importantly, there's no way to type hint the return value either. > > Hope that helps, > > --Wez. > > > On Apr 27, 2008, at 2:39 PM, Carsten Lucke wrote: > >> Hi all, >> >> the README contains a short explanation of the method signature >> hackery. Where can I get an overview of what options I have here >> (which abbreviation for which type)? I've seen the @c and also @v >> (void?). When is it necessary to add a signature and when is it not? I >> couldn't find anything about that... >> >> Any small hint is highly appreciated. Thanks a lot in advance! >> >> Kind regards, >> - Carsten >> >> >> > Method signature hackery >> > >> > The bridge isn't quite smart enough to automatically figure out type >> mapping >> > for everything, particularly if you are declaring a delegate object >> that will >> > act as a sink for events, so you will need to provide hints in some >> cases. >> > >> > You can provide the hints using doc-comments like this: >> > >> > class MyDelegate extends NSObject { >> > /** @objc:signature c@: */ >> > function run_() { >> > echo "*** run!\n"; >> > } >> > } >> > >> > the "c@:" part defines the return type and parameters for the run_ >> method; it >> > is a standard objective-C stype signature. >> >> -- >> PHP Objective-C Bridge Mailing List (http://www.php.net/) >> To unsubscribe, visit: http://www.php.net/unsub.php >> > >
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