Massimiliano Pala schrieb:
>
> Michael Bell wrote:
>
> > > The undef value is ok so we can use check like:
> > >
> > > if ( not $obj->sub() ) {
> > > error!;
> > > } else {
> > > ok!;
> > > }
> >
> > Ups, this doen't work. If $obj->sub () returns 0 then the operation was
> > successful but 0 is a false value! I'm using in the module DBI "if (not
> > defined $obj->sub())".
>
> we actually have to choose it : I would prefer the 0 = FALSE = Error way,
> anyway if this will require much work we could start restyling the other
> modules...
I think the way proposed by you is much more error proof than the way
with defined and not defined values but if we choose this way of
implementation I would be a little bit more general too.
Could we allow all FALSE values and strongly recommend "undef" or "0" if
the function fails? The following if-statement is at every time correct:
if (not $obj->sub ())
Regards Michael
The definitions until now are:
* $obj->errno ();
* $obj->errval();
* FAILED operations return a false value
* FAILED operations SHOULD return "undef" or "0"
* a failed call to OpenCA::MODULE->new () should made available
# OpenCA::MODULE->errno ();
# OpenCA::MODULE->errval ();
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