This allows you to figure out what version of a loaded module you have. This is important if, as is often the case, different versions have different APIs and you need to support multiple APIs.

The code is an example of how to use UNIVERSAL::VERSION(). This is a snippet from the upcoming PDF::Template v0.07.

   $self->{PDF_VERSION} = 0;
   for my $version (reverse 1 .. 4)
   {
      eval "UNIVERSAL::VERSION('pdflib_pl', $version.0)";
      unless ($@)
      {
         $self->{PDF_VERSION} = $version;
         last;
      }
   }
   die "Cannot find pdflib_pl version",$/ unless $self->{PDF_VERSION};

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In reply to Figuring out which version of a loaded module by dragonchild

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