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Re^2: Installing a module that is perl-version specific

by chuckbutler (Vicar)
on Apr 01, 2010 at 01:23 UTC ( #832177=note: print w/ replies, xml ) Need Help??


in reply to Re: Installing a module that is perl-version specific
in thread Installing a module that is perl-version specific

Building on the submission by ikegami:

package Date::Manip; use warnings; use strict; use Carp; use Exporter; # our @ISA; our @EXPORT; my $backend; if ($] >= 5.010) { $backend = 'Date::Manip::Perl5010'; } elsif ($] >= 5.008) { $backend = 'Date::Manip::Perl5008'; } elsif ($] >= 5.006) { $backend = 'Date::Manip::Perl5006'; } else { croak("Perl $] isn't supported\n"); } my $backend_exp = $backend . "::EXPORT"; eval "require $backend; $backend->import(); return 1;" or croak "$@ +"; { no strict qq{refs}; @EXPORT = @{$backend_exp}; } unshift (@ISA, $backend); # 1;

We pick the correct version of the module to use. Then load the module file and import the symbols dynamically, with an eval. Then we setup the @EXPORT list so it is available when the ->import() subroutine runs as part of use, the symbols are imported into Main::.

Update and Postscript:

If the package statement in the per-version Date::Manip's are left as-is, the following code is preferred:

package Date::Manip; use warnings; use strict; use Carp; use Exporter; # my $backend; if ($] >= 5.010) { $backend = 'Date::Manip::Perl5010'; } elsif ($] >= 5.008) { $backend = 'Date::Manip::Perl5008'; } elsif ($] >= 5.006) { $backend = 'Date::Manip::Perl5006'; } else { croak("Perl $] isn't supported\n"); } eval "require $backend; " or croak "$@"; # 1;

This should work well.

Good luck. -c


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