Config.pm

• Perl's standard Config module supplies a magical %Config hash

  • It appears to be full of information about Perl's configuration

     use Config;

     print "osname = $Config{osname}\n";
     print "install module manuals into  = $Config{installman3dir}\n";

        osname = linux
        install module manuals into  = /usr/local/man/man3

• Actually %Config is a tied hash

     package Config;
     ...
     @EXPORT = qw(%Config);
     ...

     sub import {
       ...

       *{"$callpkg\::Config"} = \%Config;
     }

     ...

     tie %Config, 'Config';

     1;

• "$callpkg\::Config" is equivalent to $callpkg . "::Config"

  • "$callpkg::Config" means something else

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Copyright © 2003 M. J. Dominus