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Re: [objc-improvements] Warnings when compiling GNUStep


From: Kai Henningsen
Subject: Re: [objc-improvements] Warnings when compiling GNUStep
Date: 03 Sep 2003 11:50:00 +0200

address@hidden (Ziemowit Laski)  wrote on 02.09.03 in <address@hidden>:

> they match up).  However, in a few cases we're dealing with the idiom
>
>     [[ClassName alloc] init...]
>
> in which case one _could_ make the argument that any method named
> 'alloc' should be treated
> specially by the compiler, i.e., as having a return type covariant with
> the receiver.  What
> do you think?  If we don't teach the compiler about 'alloc', then it is
> perfectly within
> its right to complain in this case also, unless we change foregoing to
> read
>
>     [(ClassName *)[ClassName alloc] init...]
>
> which, I must admit, does have a slighty redundant flavor to it. :-(
> Of course, the
> slippery slope argument applies here (if we treat 'alloc' specially,
> then what about
> 'allocWithFoo:Bar:'?...)

Or [xxx initXXX...], which is often the same situation ...

... and which suggests a rule:

Iff calling a method on id, and this id is the return value of a method  
call, and the method we want to call is supported by the receiver of  
*that* method call, accept it. (alloc, init, new are examples of this  
idiom.)

Sorry, not particularly elegant ...

MfG Kai




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