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+.\" ========================================================================
+.\"
+.IX Title "dynamic 3"
+.TH dynamic 3 "2008-05-31" "perl v5.8.7" "User Contributed Perl Documentation"
+.\" For nroff, turn off justification. Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH "NAME"
+PerlIO::via::dynamic \- dynamic PerlIO layers
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 8
+\& open $fh, $fname;
+\& $p = PerlIO::via::dynamic\->new
+\& (translate =>
+\& sub { $_[1] =~ s/\e$Filename[:\ew\es\e\-\e.\e/\e\e]*\e$/\e$Filename: $fname\e$/e},
+\& untranslate =>
+\& sub { $_[1] =~ s/\e$Filename[:\ew\es\e\-\e.\e/\e\e]*\e$/\e$Filename\e$/});
+\& $p\->via ($fh);
+\& binmode $fh, $p\->via; # deprecated
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+\&\f(CW\*(C`PerlIO::via::dynamic\*(C'\fR is used for creating dynamic PerlIO
+layers. It is useful when the behavior or the layer depends on
+variables. You should not use this module as via layer directly (ie
+:via(dynamic)).
+.PP
+Use the constructor to create new layers, with two arguments:
+translate and untranslate. Then use \f(CW\*(C`$p\-\*(C'\fRvia ($fh)> to wrap the
+handle. Once <$fh> is destroyed, the temporary namespace for the \s-1IO\s0
+layer will be removed.
+.PP
+Note that PerlIO::via::dynamic uses the scalar fields to reference to
+the object representing the dynamic namespace.
+.SH "OPTIONS"
+.IX Header "OPTIONS"
+.IP "translate" 4
+.IX Item "translate"
+A function that translate buffer upon \fIwrite\fR.
+.IP "untranslate" 4
+.IX Item "untranslate"
+A function that translate buffer upon \fIread\fR.
+.IP "use_read" 4
+.IX Item "use_read"
+Use \f(CW\*(C`READ\*(C'\fR instead of \f(CW\*(C`FILL\*(C'\fR for the layer. Useful when caller
+expect exact amount of data from read, and the \f(CW\*(C`untranslate\*(C'\fR function
+might return different length.
+.Sp
+By default \f(CW\*(C`PerlIO::via::dynamic\*(C'\fR creates line-based layer to make
+\&\f(CW\*(C`translate\*(C'\fR implementation easier.
+.SH "AUTHORS"
+.IX Header "AUTHORS"
+Chia-liang Kao <clkao@clkao.org>
+.SH "COPYRIGHT"
+.IX Header "COPYRIGHT"
+Copyright 2004 by Chia-liang Kao <clkao@clkao.org>.
+.PP
+This program is free software; you can redistribute it and/or modify it
+under the same terms as Perl itself.
+.PP
+See <http://www.perl.com/perl/misc/Artistic.html>