RE: override display() for class

[Steve White]

Hi Pascal,

Thanks for your advice!

However this doesn't really address the question.
Perhaps I shouldn't have mentioned display() at all.

The question is, how do I emulate the built-in behavior wherein
typing in an assignment results in the variable name as well as
the value being printed?

For example, if one types
    a = 1
Octave prints out the whole expression
    a = 1
I want to get this effect when, say assigning a variable to my class.

Something like
    a = myclass(1)
currently results in just
   <representation of myclass>
I want it to print out something like
    a = <representation of myclass>

This seems to me to be an obvious thing to happen....




> Date: Fri, 10 Dec 2010 01:18:38 -0800
> From: address@hidden
> To: address@hidden
> Subject: Re: override display() for class
> 
> 
> display receives as input the VALUE of an object, it is up to this function
> to suitably produce a text with the fields of the object. To determine the
> NAME of the argument passed to the function, use the "inputname" function?
> So your overloaded function should be
> 
> function text = display(myclass)
> 
> text = sprintf('%s value is %d', inputname(1), myclass.val)
> 
> endfunction
> 
> Now, overloading means having the ability to mimic some fundamental
> function, applied to a class you did define. In the name of the "least
> surprise effect", you should try to stay as close as possible to the
> fundamental function behaviour.
> 
> Regards
> 
> Pascal
> -- 
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