CODEWITHSUNDEEP
perlperl-module
sam forums
sam forums

Reputation: 21

Undefined subroutine in perl &library1::func1

I am calling a function (func1) from library2.pm in library1.pm. And the function is called simply as &func1(), since I declared " use library2 " in library1. But this is throwing an error as the undefined subroutine. But when I am calling that function as " &library2::func1 " it is working. Am I missing any Perl package here?

Upvotes: 0

Views: 365

Answers (1)

ikegami
ikegami

Reputation: 385789

Did you export the function? It's hard to tell what you're missing since you didn't post any code! I could explain why you need what's missing if I knew what it was. Instead, you'll have to settle for an example of what's needed.

library2.pm should include:

package library2;

use strict;
use warnings;

use Exporter qw( import );

our @EXPORT = qw( func1 );

...

sub func1 { ... }

...

1;

library1.pm should include:

package library1;

use strict;
use warnings;

use library2;

...

func1(...)

...

1;

By the way, the name of the language is Perl, not PERL. It's not an acronym.

By the way, you should stop using & in front of sub calls; there's no reason to tell Perl to ignore the prototypes of the subs you call.

By the way, lower-case module names are technically reserved for use by Perl. But more importantly, convention reserves lower-case modules for pragma modules (modules that affect the language, and modules that are lexically-scoped in effect). Please avoid lower-case module names.

By the way,

use library2 qw( func1 );

is generally better than

use library2;

because it's easier to see where subs are defined, and it prevents surprises if the default exports of a module ever change.

Upvotes: 2

Related Questions