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.\" ========================================================================
.\"
.IX Title "Statistics::R::REXP::Null 3pm"
.TH Statistics::R::REXP::Null 3pm "2022-02-10" "perl v5.34.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
Statistics::R::REXP::Null \- the R null object
.SH "VERSION"
.IX Header "VERSION"
version 1.0002
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    use Statistics::R::REXP;
\&    
\&    my $null = Statistics::R::REXP::Null\->new();
\&    say $rexp\->is_null;
\&    print $rexp\->to_pl;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
An object of this class represents the null R object (\f(CW\*(C`NILSXP\*(C'\fR). The
null object does not have a value or attributes, and trying to set
them will cause an exception.
.SH "METHODS"
.IX Header "METHODS"
\&\f(CW\*(C`Statistics::R::REXP::Null\*(C'\fR inherits from Statistics::R::REXP and
adds no methods of its own.
.SS "\s-1ACCESSORS\s0"
.IX Subsection "ACCESSORS"
.IP "sexptype" 4
.IX Item "sexptype"
\&\s-1SEXPTYPE\s0 of null objects is \f(CW\*(C`NILSXP\*(C'\fR.
.IP "to_pl" 4
.IX Item "to_pl"
The Perl value of \f(CW\*(C`NULL\*(C'\fR is \f(CW\*(C`undef\*(C'\fR.
.IP "attributes" 4
.IX Item "attributes"
Null objects have no attributes, so the attributes accessor always
returns \f(CW\*(C`undef\*(C'\fR.
.SH "BUGS AND LIMITATIONS"
.IX Header "BUGS AND LIMITATIONS"
Classes in the \f(CW\*(C`REXP\*(C'\fR hierarchy are intended to be immutable. Please
do not try to change their value or attributes.
.PP
There are no known bugs in this module. Please see
Statistics::R::IO for bug reporting.
.SH "SUPPORT"
.IX Header "SUPPORT"
See Statistics::R::IO for support and contact information.
.SH "AUTHOR"
.IX Header "AUTHOR"
Davor Cubranic <cubranic@stat.ubc.ca>
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
This software is Copyright (c) 2017 by University of British Columbia.
.PP
This is free software, licensed under:
.PP
.Vb 1
\&  The GNU General Public License, Version 3, June 2007
.Ve