🚀 go-pugleaf

In article <CLqL0u.9KL@cdsmail.cdc.com> Ben Youngdahl  
<Ben.Youngdahl@cdc.com> writes:
> This sounds interesting... is this Objective-C++ only available to NeXT
> users? 
   As far as I can tell GNU gcc does not yet support Objective-C++,  
althought it accepts the flag "-lang-objc++".   So that leaves only the NeXT  
version of gcc

> Does it allow multiple inheritence? 
   No, because Objective-C doesn't.

> Can a class have one method written in Objective-C, and another 
> written in C++? 
    No.

> How freely can you mix the code?
> 
   Here are some examples...
// init method in SimpleCalc.C; an Objective-C++ class
- init
{
    cplus_object = new CalcEngine; // new is a keyword in C++.
    previousAction = 0; 
    return self;
}
// User pressed the Clear All key.
- clearAllKey:sender
{
    cplus_object->clear();  // invoke C++ member function
    [self registerAction:0];
    return [self clearKey:sender];
}

// snipet
[display setDoubleValue:
	 cplus_object->equalsKey([display doubleValue])];

// send display doubleValue message, use return value as argument to C++ 
// member function; take return value as argument to setDoubleValue method.

> Please pardon my struggling to remember objective-C syntax, but I seem to 
> recall that one of the best things about Objective-C was the run-time
> binding
> of calling methods.  I.e.,  you want to call the method "foo" for an
> object 
> "bar", you'd do: [bar "foo"]   or something like that, and if the object
> "bar"
   It's [bar foo]

> didn't have a  "foo" method, ... no harm done.  Am I correct?  
> 
    No, you get a run-time error saying bar does not implement foo.

--
Paul F. Kunz	Paul_Kunz@slac.stanford.edu (NeXT mail ok)
Stanford Linear Accelerator Center, Stanford University
Voice: (415) 926-2884   (NeXT) Fax: (415) 926-3587