Re: What Are The Rules For Subs And Modules When Fed Wrong Input

Cody,

One of the things I use to get around things like this is to use anonymous hashes to call subroutines. For example:

my ($value,$error) = my_sub(input => 'who', inny => 'what');
unless ($value) {
    my_abort ("There was an error: ",$error);
}
[download]

and then, in my_sub

sub my_sub {
    my %args = {
        input => undef,
        inny  => undef,
        @_
    };
    return(undef,"Missing inny") unless $args->{'inny'};
    # do some stuff
    if ($problem) {
        return(undef,$error_msg);
    }
    return($value,undef);
}
[download]

As you can see, with this you can test for each input requirement by name, dieing on the "gotta-have-its" and just warning on the "ok-I-dont-need-its".
The my_abort could even be changed to check for error severity and do a warn or die based on that.

Anyhow, just my 2 cents on handling sub calls that may return errors.

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Re: Re: What Are The Rules For Subs And Modules When Fed Wrong Input by bcisys (Initiate) on Jul 25, 2002 at 16:57 UTC
There's a small typo in the code example: `sub my_sub { # my %args = { # Was... my $args = { # Should be... input => undef, inny => undef, @_ };` [download]	[reply] [d/l]