Bug in the if test

[Jaroslav Hajek]

On Tue, Aug 12, 2008 at 11:07 AM, Zdenek Wagner
<wagner at hroch486.icpf.cas.cz> wrote:
> To: bug at octave.org
> Cc: zdenek.wagner at gmail.com
> Subject: Bug in the if test
>
> Bug report for Octave 3.0.1 configured for i386-redhat-linux-gnu
>
> Description:
> -----------
>
>  * I have the following code in order to make the same program work in several
>    versions of Octave:
>
> if exist("save_precision") == 5
>  oldprec = save_precision(newprec);
> else
>  oldprec = save_precision;
>  save_precision = newprec;
> endif
>
> Yet Octave emits warning that save_precision is no longer a builtin variable
> although exist("save_precision") does return 5.
>
> Repeat-By:
> ---------
>
> The code is inside a function written by me. The bug occurs both when called
> interactivelly and when invoked from a script started by
> octave -qH script.m
>
> Fix:
> ---
>

Currently, the check is made at parse time. The attached patch
postpones it until first actual execution of the statement (but only
warns once).

cheers,


-- 
RNDr. Jaroslav Hajek
computing expert
Aeronautical Research and Test Institute (VZLU)
Prague, Czech Republic
url: www.highegg.matfyz.cz
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