[Caml-list] Duplicate methods - bug or feature?

[Caml-list] Duplicate methods - bug or feature?

[Paul Stodghill]

Is it a bug or feature that a class can contain two methods with the
same name? Thanks.

milhouse$ uname -a
CYGWIN_NT-5.0 MILHOUSE 1.3.2(0.39/3/2) 2001-05-20 23:28 i686 unknown
milhouse$ ocamlc -v
The Objective Caml compiler, version 3.02
Standard library directory: /usr/local/lib/ocaml
milhouse$ 
milhouse$ 
milhouse$ cat double_method.ml 
class a =
object
  method m = "a.m1"
  method m = "a.m2"
end
;;

let _ =
  let x = new a in
    Printf.printf "x=%s\n" x#m;
    ()
;;

milhouse$ 
milhouse$ 
milhouse$ ocamlc -o double_method.exe double_method.ml 
milhouse$ ./double_method.exe 
x=a.m2
milhouse$ 

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Re: [Caml-list] Duplicate methods - bug or feature?

[Alan Schmitt]

You might consider it a feature, due to multiple inheritance. IIRC, when
a class inherits from two classes which define the same method name, the
last one wins.

Alan Schmitt

* Paul Stodghill (stodghil@cs.cornell.edu) wrote:
> Is it a bug or feature that a class can contain two methods with the
> same name? Thanks.
> 
> milhouse$ uname -a
> CYGWIN_NT-5.0 MILHOUSE 1.3.2(0.39/3/2) 2001-05-20 23:28 i686 unknown
> milhouse$ ocamlc -v
> The Objective Caml compiler, version 3.02
> Standard library directory: /usr/local/lib/ocaml
> milhouse$ 
> milhouse$ 
> milhouse$ cat double_method.ml 
> class a =
> object
>   method m = "a.m1"
>   method m = "a.m2"
> end
> ;;
> 
> let _ =
>   let x = new a in
>     Printf.printf "x=%s\n" x#m;
>     ()
> ;;
> 
> milhouse$ 
> milhouse$ 
> milhouse$ ocamlc -o double_method.exe double_method.ml 
> milhouse$ ./double_method.exe 
> x=a.m2
> milhouse$ 
> 
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Re: [Caml-list] Duplicate methods - bug or feature?

[Paul Stodghill]

While I understand how this is handy in the case of multiple
inheritance, I don't see how this is useful when both methods are in the
same class. I think that if duplicates methods appear in a class, then
it is very likely to be an error. At a minimum, a warning should be
issues that the first method will be ignored.

I bring this up, because I just tracked down a bug in some of my own
code that resulted from two methods with the same name existing in the
same class. It was a "cut and paste" error on my part.

Thanks.


> You might consider it a feature, due to multiple inheritance. IIRC, when
> a class inherits from two classes which define the same method name, the
> last one wins.
> 
> Alan Schmitt
> 
> * Paul Stodghill (stodghil@cs.cornell.edu) wrote:
> > Is it a bug or feature that a class can contain two methods with the
> > same name? Thanks.
> > 
> > milhouse$ uname -a
> > CYGWIN_NT-5.0 MILHOUSE 1.3.2(0.39/3/2) 2001-05-20 23:28 i686 unknown
> > milhouse$ ocamlc -v
> > The Objective Caml compiler, version 3.02
> > Standard library directory: /usr/local/lib/ocaml
> > milhouse$ 
> > milhouse$ 
> > milhouse$ cat double_method.ml 
> > class a =
> > object
> >   method m = "a.m1"
> >   method m = "a.m2"
> > end
> > ;;
> > 
> > let _ =
> >   let x = new a in
> >     Printf.printf "x=%s\n" x#m;
> >     ()
> > ;;
> > 
> > milhouse$ 
> > milhouse$ 
> > milhouse$ ocamlc -o double_method.exe double_method.ml 
> > milhouse$ ./double_method.exe 
> > x=a.m2
> > milhouse$ 
> > 
> > -------------------
> > Bug reports: http://caml.inria.fr/bin/caml-bugs  FAQ: http://caml.inria.fr/FAQ/
> > To unsubscribe, mail caml-list-request@inria.fr  Archives: http://caml.inria.fr
> 
> 
> --
> The hacker: someone who figured things out and made something cool happen.

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