Having switched to Sub::Exporter from Exporter, I came across functionality differences. If one of your sub routine names is not defined, Sub::Exporter croaks where as Exporter does not export that name.

Currently I have a number of constants that get AUTOLOADed through:

# This AUTOLOAD is used to 'autoload' constants from the constant() XS
+ function.
sub AUTOLOAD {
    my $constname;
    our $AUTOLOAD;
    ($constname = $AUTOLOAD) =~ s/.*:://;
    croak "&Blah::constant not defined" if $constname eq 'constant';
    my ($error, $val) = constant($constname);
    if ($error) { croak $error; }
    {
        no strict 'refs';
        *$AUTOLOAD = sub { $val };
    }
    goto &$AUTOLOAD;
}

[download]

(this being the standard h2xs boilerplate code).

Is it better practice to setup 1 sub routine for each constant such as:

foreach my $constname (@constants) {
    {
        no strict 'refs';
        *$constname = sub {
            use strict;
            my ($error, $val) = constant($constname);
            if ($error) { croak $error; }
            return $val;
          }
    }
}

[download]

for Sub::Exporter?

The only downside I can see is the added code overhead, but not having AUTOLOAD around seems like a win.

In reply to Using sub routines or AUTOLOAD for XS constants by aflott

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