Re: Forwarding when subclassing is not possible...

[Scott Christley]

At 10:06 PM 8/14/97 -0700, Benedikt Stefansson wrote:
>
>- (void)forwardInvocation:(NSInvocation *)anInvocation {
>    if ([someOtherObject respondsToSelector:
>            [anInvocation selector]])
>        [anInvocation invokeWithTarget:someOtherObject];
>   else
>        [self doesNotRecognizeSelector:[anInvocation selector]];
>}

Actually forwardInvocation (and NSInvocation) are newer methods that are
part of OpenStep, the older method is just called forward::

This is Object.m implementation of forward in the GNU runtime.

- (retval_t)forward:(SEL)aSel :(arglist_t)argFrame
{
  return (retval_t)[self doesNotRecognize: aSel];
}

So you want to implement forward:: for your class and then you will get the
messages like you want.

Scott

PS: the forward:: method will always exist, for OpenStep what happens is
that NSObject's forward:: method creates an NSInvocation object then calls
the forwardInvocation: method.


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