R. Joseph Newton wrote:
>
> l Maldonado Torres wrote:
>
> >
> > I am trying to use prototype functions with object but this seems not
> > to work, I mean perl does not check for the type of arguments.
> >
> > I usually do this.
> >
> > sub array_print(\@);
> > ...sub array_print(\@)
> > ...
>
> Your immediate problem here is that you are trying to use an expression as a
> formal argument. Formal arguments in Perl can only take storage types. Really,
> the only meaningful ones are scalar and list. The list, if it is present, must
> be the last parameter, and there can only be one, since any list will consume
> all arguments offered from there on.
>
> The formal parmeter expressions you show are both array references. These are
> scalars. They should be prtotyped as $.
Sorry Joseph. This from perldoc perlsub
Prototypes
Perl supports a very limited kind of compile-time argument checking
using function prototyping. If you declare
sub mypush (\@@)
then "mypush()" takes arguments exactly like "push()" does.
Cheers,
Rob
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