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.IX Title "ConstOptree 3pm"
.TH ConstOptree 3pm "2018-11-01" "perl v5.28.0" "User Contributed Perl Documentation"
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.SH "NAME"
B::ConstOptree \- Optree constant folding for $^O, $^V, and $]
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 4
\& $ perl \-MO=ConstOptree \-MO=Deparse} \-e \e
\&        \*(Aqrequire ($^O eq "MSWin32" ? "Win32.pm" : "POSIX.pm")\*(Aq
\& require \*(AqPOSIX.pm\*(Aq;
\& \-e syntax OK
.Ve
.SH "DESCRIPTION"
.IX Header "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 $] arguments are replaced with
constant terms like \*(L"linux\*(R", v5.16.1, and 5.016001, respectively.
.SH "CAVEATS"
.IX Header "CAVEATS"
Since regexp matching is not subject to constant folding, expressions like
\&\f(CW\*(C`$^O =~ /win32/i\*(C'\fR will not be reduced.
.SH "AUTHOR"
.IX Header "AUTHOR"
Written by Alexey Tourbin <at@altlinux.org>.
.SH "COPYING"
.IX Header "COPYING"
Copyright (c) 2012 Alexey Tourbin
.PP
This is free software; you can redistribute it and/or modify it under the terms
of the \s-1GNU\s0 General Public License as published by the Free Software Foundation;
either version 2 of the License, or (at your option) any later version.