Re: Octave Classes Usage

[David Grundberg]

Pablo Daniel Pareja Obregon skrev:
> Hi everyone,
> 
> I'm trying to use octave class function to define my own structure to hold 
> properties and data. I searched for examples on the web, and what I found so 
> far is something like this:
> 
> @foo/foo.m:
> function obj = foo()
>    obj.name = "foo" ;
>    obj = class(obj, "foo") ; 
> 
> However, when invoking x = foo() from the command line typeinfo(x) returns 
> "class" when it should be "foo". 

typeinfo is used to debug the interpreter.  Use class (x) to determine
the object's class.

>         After creating x, if I try to access any
> fields (for example issuing the command x.name), I get the following error:
> 
> error: invalid index for class

No, callers don't have access to the class fields.  They are private and
can only be accessed from methods.

> 
> Finally, if I try to modify any field in x (x.name = "John"), octave crashes. 
> with the following message:
> 
> panic: Segmentation fault -- stopping myself...
> attempting to save variables to `octave-core'...
> save to `octave-core' complete
> Segment fault
> 

Segfaults, that's a bug.  But again, you cannot access fields from
outside methods.

> I am currently using Debian Testing, and my octave version is 3.2.4-4.
> 
> Am I using the class in the correct way? Is it a bug? Thanks in advance.
> 
> Regards,
> Pablo
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