bugGNU Octave - Bugs: bug #53375, Interpreter passes magic-colon to...


bug #53375: Interpreter passes magic-colon to m-file function

Submitter:  Oliver Heimlich <oheim>
Submitted:  Sun 18 Mar 2018 11:51:40 AM UTC
Category:  Interpreter Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Unexpected Error or Warning
Status:  None Assigned to:  None
Originator Name:  Oliver Heimlich Open/Closed:  * Open
Release:  * dev Operating System:  * Any
Fixed Release:  None Planned Release:  None
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Thu 19 Apr 2018 05:04:26 AM UTC, comment #1: 

Is this with old style @-classes, or modern classdef classes?

Do you have the complete code for a test class that would show this bug?

Rik <rik5>
Project Administrator
Sun 18 Mar 2018 11:51:40 AM UTC, original submission:  

When a class overrides the “numel” method and an object of the class is indexed with '()' and '.' at the same time, the overridden “numel” method can be called with the magic-colon as an argument.

myclass ()(:).xxx

This magic-colon is of limited use in the m-file. Trying to use it on functions, e. g. the built-in numel function, always results in an error “invalid use of colon in function argument list”.

function result = numel (this, varargin)
  result = numel (this.internaldata, varargin{:});

However, I have found out that the magic-colon can be used in an indexing expression with '()', so the following would be a work-around for above-mentioned method:

function result = numel (this, varargin)
  result = numel (this.internaldata(varargin{:}));

I'd suggest that the magic-colon is replaced by the string ':' before it is passed to the m-file “numel” method.

Oliver Heimlich <oheim>


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