NAME

       B::ConstOptree - Optree constant folding for $^O, $^V, and $]

SYNOPSIS

        $ perl -MO=ConstOptree -MO=Deparse} -e \
               'require ($^O eq "MSWin32" ? "Win32.pm" : "POSIX.pm")'
        require 'POSIX.pm';
        -e syntax OK

DESCRIPTION

       This module propagates constant folding for $^O, $^V, and $] variables by installing
       custom PL_check handlers for numeric and string comparison opcodes.  In the handlers,
       references to $^O, $^V, and $] arguments are replaced with constant terms like "linux",
       v5.16.1, and 5.016001, respectively.

CAVEATS

       Since regexp matching is not subject to constant folding, expressions like "$^O =~
       /win32/i" will not be reduced.

AUTHOR

       Written by Alexey Tourbin <at@altlinux.org>.

COPYING

       Copyright (c) 2012 Alexey Tourbin

       This is free software; you can redistribute it and/or modify it under the terms of the GNU
       General Public License as published by the Free Software Foundation; either version 2 of
       the License, or (at your option) any later version.