UNIVERSAL::isa

UNIVERSAL::isa(3pm)   User Contributed Perl Documentation  UNIVERSAL::isa(3pm)



NAME
       UNIVERSAL::isa - Attempt to recover from people calling UNIVERSAL::isa
       as a function

SYNOPSIS
               # from the shell
               echo 'export PERL5OPT=-MUNIVERSAL::isa' >> /etc/profile

               # within your program
               use UNIVERSAL::isa;

DESCRIPTION
       Whenever you use "isa" in UNIVERSAL as a function, a kitten using
       Test::MockObject dies. Normally, the kittens would be helpless, but if
       they use UNIVERSAL::isa (the module whose docs you are reading), the
       kittens can live long and prosper.

       This module replaces "UNIVERSAL::isa" with a version that makes sure
       that, when called as a function on objects which override "isa", "isa"
       will call the appropriate method on those objects

       In all other cases, the real "UNIVERSAL::isa" gets called directly.

WARNINGS
       If the lexical warnings pragma is available, this module will emit a
       warning for each naughty invocation of "UNIVERSAL::isa". Silence these
       warnings by saying:

               no warnings 'UNIVERSAL::isa';

       in the lexical scope of the naughty code.

SEE ALSO
       UNIVERSAL::can for a more mature discussion of the problem at hand.

       Test::MockObject for one example of a module that really needs to over-
       ride "isa()".

AUTHORS
       Autrijus Tang <autrijus AT autrijus.org>

       chromatic <chromatic AT wgz.org>

       Yuval Kogman <nothingmuch AT woobling.org>

COPYRIGHT & LICENSE
       Same as Perl, (c) 2005 - 2006.



perl v5.8.8                       2006-02-24               UNIVERSAL::isa(3pm)