On 2010 Mar 29, at 12:06, Philip Mötteli wrote:

> I never said, it's not possible. But it's a huge task to re-implement a 
> general method like this. If you understand, that you have to treat every 
> different argument type dynamically.

Maybe I don't understand, but a couple years ago I wrote this little method 
that creates an invocation in one line of code

+ (NSInvocation*)invocationWithTarget:(id)target
                             selector:(SEL)selector
                      retainArguments:(BOOL)retainArguments
                    argumentAddresses:(void*)firstArgumentAddress, ... ;

It handles all argument types, using varargs and the method signature of the 
selector.  I'll post the code if you're interested.

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