Re: OO in octave.

[Julien Bect]

Ernst Reissner wrote
> I just wondered, whether octave checks for the first argument only.
> And i was confused, that i did nowhere in the docu find a word about the
> search mechanism.
> Something like:
> "If the first argument arg1 has class 
> <cls>
>  (determined by function
> class(arg1)),
> then the function definition is searched for in folder @
> <cls>
>  and
> subfolders recursively. "
> 
> Is this the truth?

Hello Ernst,

No, it's not the truth...  An overloaded function can be called if any of
the arguments, /regardless of its position/, is an object.

If several arguments are objects, then the appropriate function is chosen
based on a *precedence* mechanism :

http://www.gnu.org/software/octave/doc/interpreter/Precedence-of-Objects.html#Precedence-of-Objects
<http://www.gnu.org/software/octave/doc/interpreter/Precedence-of-Objects.html#Precedence-of-Objects>
  

Even if an argument is of class "cls", the function that is called is not
necessarily in @cls because of the *inheritance* mechanism (it might be in
the @ folder of the parent class, if the required function is not overloaded
by cls but is defined or overloaded by the parent class).

http://www.gnu.org/software/octave/doc/interpreter/Inheritance-and-Aggregation.html#Inheritance-and-Aggregation
<http://www.gnu.org/software/octave/doc/interpreter/Inheritance-and-Aggregation.html#Inheritance-and-Aggregation>
  

I'm not sure about how precedence and inheritance interact, though...

Julien.




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