Re^2: How to export a package sitting lower in a module?

Corion and kennethk:

It works best if you put separate packages into separate files.

Sometimes (especially if you have an object-oriented project, with many little packages), it's not convenient to have each package in a speparate file.

So the solution is to add the export text (as Corion says) and then invoke import directly, i.e. pack_B->import.

Please note that this still doesn't work: the .pm module fails, complaining that the second @ISA is a bareword.

Main script:

use pack_A;
pack_B->import;
third();
[download]

The packages:

# Name of this file: pack_A.pm
package pack_A;
use strict;
require Exporter;
@ISA = qw {Exporter};
@EXPORT = qw {first second};

sub first {
}
sub second {
}
1;
#end package pack_A;

package pack_B;
use strict;
require Exporter;
@ISA = qw {Exporter};
@EXPORT = qw {third fourth};
sub third {
}
sub fourth {
}
1;
#end package pack_B;
#end of file pack_A.pm
[download]

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Re^3: How to export a package sitting lower in a module? by kennethk (Abbot) on Apr 22, 2013 at 15:38 UTC
Sometimes (especially if you have an object-oriented project, with many little packages), it's not convenient to have each package in a speparate file. If you are doing OO programming in Perl, you don't need to import anything. Using packages as libraries and exporting subroutines into a user space is actually a direct contradiction with a rigid OO model. Please note that this still doesn't work: the .pm module fails, complaining that the second @ISA is a bareword. That's because you're violating strict. Try our: `package pack_B; use strict; require Exporter; our @ISA = qw {Exporter}; our @EXPORT = qw {third fourth}; sub third { } sub fourth { } 1;` [download] #11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.	[reply] [d/l]
Re^4: How to export a package sitting lower in a module? by HelenCr (Monk) on Apr 22, 2013 at 20:00 UTC
Thank you, kennethk. That works (provided that you use "our @ISA" and "our @EXPORT" both in the first (pack_A) and the second (pack_B) packages). Many thanks - Helen	[reply]