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.\" ========================================================================
.\"
.IX Title "ExtUtils::Typemaps::OutputMap 3"
.TH ExtUtils::Typemaps::OutputMap 3 "2019-10-24" "perl v5.30.2" "Perl Programmers Reference Guide"
.\" 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"
ExtUtils::Typemaps::OutputMap \- Entry in the OUTPUT section of a typemap
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 5
\&  use ExtUtils::Typemaps;
\&  ...
\&  my $output = $typemap\->get_output_map(\*(AqT_NV\*(Aq);
\&  my $code = $output\->code();
\&  $output\->code("...");
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Refer to ExtUtils::Typemaps for details.
.SH "METHODS"
.IX Header "METHODS"
.SS "new"
.IX Subsection "new"
Requires \f(CW\*(C`xstype\*(C'\fR and \f(CW\*(C`code\*(C'\fR parameters.
.SS "code"
.IX Subsection "code"
Returns or sets the \s-1OUTPUT\s0 mapping code for this entry.
.SS "xstype"
.IX Subsection "xstype"
Returns the name of the \s-1XS\s0 type of the \s-1OUTPUT\s0 map.
.SS "cleaned_code"
.IX Subsection "cleaned_code"
Returns a cleaned-up copy of the code to which certain transformations
have been applied to make it more \s-1ANSI\s0 compliant.
.SS "targetable"
.IX Subsection "targetable"
This is an obscure but effective optimization that used to
live in \f(CW\*(C`ExtUtils::ParseXS\*(C'\fR directly. Not implementing it
should never result in incorrect use of typemaps, just less
efficient code.
.PP
In a nutshell, this will check whether the output code
involves calling \f(CW\*(C`sv_setiv\*(C'\fR, \f(CW\*(C`sv_setuv\*(C'\fR, \f(CW\*(C`sv_setnv\*(C'\fR, \f(CW\*(C`sv_setpv\*(C'\fR or
\&\f(CW\*(C`sv_setpvn\*(C'\fR to set the special \f(CW$arg\fR placeholder to a new value
\&\fB\s-1AT THE END OF THE OUTPUT CODE\s0\fR. If that is the case, the code is
eligible for using the \f(CW\*(C`TARG\*(C'\fR\-related macros to optimize this.
Thus the name of the method: \f(CW\*(C`targetable\*(C'\fR.
.PP
If this optimization is applicable, \f(CW\*(C`ExtUtils::ParseXS\*(C'\fR will
emit a \f(CW\*(C`dXSTARG;\*(C'\fR definition at the start of the generated \s-1XSUB\s0 code,
and type (see below) dependent code to set \f(CW\*(C`TARG\*(C'\fR and push it on
the stack at the end of the generated \s-1XSUB\s0 code.
.PP
If the optimization can not be applied, this returns undef.
If it can be applied, this method returns a hash reference containing
the following information:
.PP
.Vb 5
\&  type:      Any of the characters i, u, n, p
\&  with_size: Bool indicating whether this is the sv_setpvn variant
\&  what:      The code that actually evaluates to the output scalar
\&  what_size: If "with_size", this has the string length (as code,
\&             not constant, including leading comma)
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
ExtUtils::Typemaps
.SH "AUTHOR"
.IX Header "AUTHOR"
Steffen Mueller \f(CW\*(C`<smueller@cpan.org\*(C'\fR>
.SH "COPYRIGHT & LICENSE"
.IX Header "COPYRIGHT & LICENSE"
Copyright 2009, 2010, 2011, 2012 Steffen Mueller
.PP
This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.