[Openmcl-devel] Specifying data types for calls via the Obj-C bridge with a variable number of arguments

Phil pbpublist at comcast.net
Sat Apr 28 20:19:25 UTC 2007


OK, got it.  Thanks for the explanation.

Phil

On Apr 28, 2007, at 2:37 AM, Gary Byers wrote:

>
>
> On Sat, 28 Apr 2007, Phil wrote:
>
>> Ah... thanks!  Am I correct in assuming you meant (objc:send  
>> (objc:@class "NSString") :string-with-format #@"Testing: %@" (:id  
>> "one two three four")) as an example of using a Lisp string?   
>> (i.e. it appears to work but seems a little weird as %@ is used in  
>> the format string.)
>>
>> Thanks,
>> Phil
>
>
> No, I meant to say (:id #@"one two three four").
>
> SEND does some coercion of lisp strings to NSStrings, but I'm not
> sure that it does so in the case of non-fixed arguments, and I'm not
> sure that it's a good idea (who releases that consed-up NSString and
> when does this happen ?  In the case of a string constant, does
> the ability to sometimes skip the #@ buy you much in terms of
> readability ?)
>
> "%@" in an ObjC format string basically means "use the printable
> representation of the next arg, which should be an ObjC object."
> #@"one, two, three, four" is an ObjC object ...




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