I am trying to incorporate version numbers into modules that will only be used internally and cannot get it to work. As a basic testcase, I have the following file Foo.pm, located at '/home/user/perl_modules/lib/perl5/My/Foo.pm': 

package Foo;

our $VERSION = '1.0';

use strict;
use warnings;

sub new
{
    my $class = shift();

    my ($arguments) = @_;

    my $self = {};

    bless $self, $class;
}

[download]

I also have the following script, foo_version_test.pl, used to test the version number of Foo.pm: 

#!/tool/bin/perl -w
use strict;
use lib '/home/user/perl_modules/lib/perl5';
use My::Foo 1.0;

printf("version = %s\n", $Foo::VERSION);

[download]

Running the script produces the following output: 

My::Foo defines neither package nor VERSION--version check failed at .
+/foo_version_test.pl line 4.
BEGIN failed--compilation aborted at ./foo_version_test.pl line 4.

[download]

I'm not sure what's going wrong here given that both the package and VERSION statements exist in Foo.pm.

On a related note, if I have modules that will only be used internally and that I want to version (as opposed to modules I download from CPAN, in which subsequent module updates overwrite the previous module version), suppose I have the following directory structure: 

/home/user/perl_modules/lib/perl5/My/FooVersion
    1.0/
        Foo.pm
    1.1/
        Foo.pm
    1.2/
        Foo.pm
    Devel/
        Foo.pm

[download]

How would I use a particular version of Foo.pm in my script? Perl is fine with: 

use My::FooVersion::Devel::Foo;

[download]

but trying to reference any of the numbered versions in the same manner, even when I quote either the numerical portion or the entire string, produces syntax errors. For example, none of the following work: 

use My::FooVersion::1.1::Foo;
use "My::FooVersion::1.1::Foo";
use My::FooVersion::"1.1"::Foo;
use My::FooVersion::'1.1'::Foo;
use 'My::FooVersion::1.1::Foo';

[download]

In reply to help with versioning modules by Special_K

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.