Typed selector on apple runtime question (StepTalk porting)

[stefan]

Hi,

In StepTalk framework there is the method that will return a method signature
according to a selector. NSMEthodSignature requires types to be created. If
there are no types for given selector, then they are created with id for return
value and id for each argument (parsed ':' from selector name).

>From dev-libs/StepTalk/Frameworks/StepTalk/STObjCRuntime.m:

NSMethodSignature *STMethodSignatureForSelector(SEL sel)
{
    const char *types;
    
    types = sel_get_type(sel);
    
    if(!types)
    {
        sel = STCreateTypedSelector(sel);
        types = sel_get_type(sel);
    }
    return [NSMethodSignature signatureWithObjCTypes:types];
}

(to see whole source online:
http://savannah.gnu.org/cgi-bin/viewcvs/gnustep/gnustep/dev-libs/StepTalk/Frameworks/StepTalk/STObjCRuntime.m?rev=1.5&content-type=text/vnd.viewcvs-markup)

However, there is no sel_get_type(sel) equivalent on OSX. Any hints how can be
this miplemented on Apple runtime?

Or if you think that the whole problem can be solved differently, then let me
know how to do it.

Thanks,

Stefan Urbanek