NAME

       Scalar::Readonly - functions for controlling whether any scalar variable is read-only

SYNOPSIS

         use Scalar::Readonly ':all';
         my $foo = "foo";
         readonly_on($foo);
         $foo = "bar";  #ERROR!

         if (readonly($foo)) {
           readonly_off($foo);
         }

         readonly_off($]);
         $] = "6.0";

         print "This is Perl v$]";

DESCRIPTION

       This simple module can make scalars read-only. Useful to protect configuration variables,
       for example.

       This module can also be used to subvert Perl's many read-only variables to potential evil
       trickery.

   readonly
       Ths function takes a scalar variable and tells you whether it is read-only. It returns 0
       if the scalar isn't read-only, and a positive number if it is.

   readonly_on
       Makes the passed scalar variable read-only. If you try and modify a read-only scalar, your
       code will die with the following error message:

         Modification of a read-only value attempted at

   readonly_off
       Makes the passed scalar variable read-write. You can even do this to read-only special
       variables, though you almost certainly don't want to do that.

   EXPORT
       ':all' => readonly, readonly_on, readonly_off

SEE ALSO

       Scalar::Util, Attribute::Constant, Const::Fast.

AUTHOR

       Philippe M. Chiasson, <gozer@cpan.org>

COPYRIGHT AND LICENSE

       Copyright (C) 2004 by Philippe M. Chiasson

       This library is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself, either Perl version 5.8.3 or, at your option, any later version of
       Perl 5 you may have available.