NAME
   PerlIO::code - Makes a simple I/O filter

SYNOPSIS
           use PerlIO::code; # need to say explicitly

           # make an input filter
           open my $in, '<', sub{ uc scalar <> };
           print while <$in>;

           # make an output filter
           open my $out, '>', sub{ print uc shift };
           print $out while <>;

DESCRIPTION
   "PerlIO::code" helps to make an I/O filter. It is easier than "tie", but
   provides very limited functions. All it can do is to "readline" and
   "print".

NOTES
   *   For some reason, the actual layer name of "PerlIO::code" is ":Code",
       not ":code".

   *   "PerlIO::code" is slower than the "tie" interface.

   *   "open my $in, '<', sub{ "foo" }; my $s = <$in>;" makes an endless
       loop, because the internal "readline" routine reads $in on until
       reaching EOF.

CONFIGURATION AND ENVIRONMENT
   No configuration files or environment variables.

DEPENDENCIES
   Perl 5.8.1 or later, and a C compiler.

BUGS AND LIMITATIONS
   No bugs have been reported.

   Please report any bugs or feature requests to
   "[email protected]", or through the web interface at
   <http://rt.cpan.org/>.

SEE ALSO
   Tie::Handle.

   PerlIO::via.

   PerlIO.

AUTHOR
   Goro Fuji "<gfuji (at) cpan.org>"

LICENCE AND COPYRIGHT
   Copyright (c) 2008, Goro Fuji "<gfuji (at) cpan.org>". Some rights
   reserved.

   This module is free software; you can redistribute it and/or modify it
   under the same terms as Perl itself. See perlartistic.

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