NAME

Statistics::R::REXP::Closure - an R closure

VERSION

version 0.10

SYNOPSIS

    use Statistics::R::REXP::Closure
    
    my $clos = Statistics::R::REXP::Closure->new(body => {
        Statistics::R::REXP::Language->new([
            Statistics::R::REXP::Symbol->new('mean'),
            Statistics::R::REXP::Double->new([1, 2, 3])
    ])
    });
    print $env->elements;

DESCRIPTION

An object of this class represents an R closure (ENVSXP). Closures in R are constructed with function and consist of a arguments(args) -- optionally with default values (defaults); a body; and an environment, a pointer to an enclosing evaluation frame when the closure is used.

These objects represent calls (such as model formulae), with first element a reference to the function being called, and the remainder the actual arguments of the call. Names of arguments, if given, are recorded in the 'names' attribute (itself as Statistics::R::REXP::Character vector), with unnamed arguments having name ''. If no arguments were named, the environment objects will not have a defined 'names' attribute.

You shouldn't create instances of this class, it exists mainly to handle deserialization of ENVSXPs by the IO classes.

METHODS

Statistics::R::REXP:Environment inherits from Statistics::R::REXP, with the added restriction that its first element has to be a Statistics::R::REXP::Symbol or another Environment instance. Trying to create a Closure instance that doesn't follow this restriction will raise an exception.

ACCESSORS

args

An reference to the array of argument names.

defaults

Returns an array reference to default values of corresponding arguments, or undefs if the argument does not have a default. (If none of the arguments have defaults, this can be an empty array.

body

Returns the Statistics::R::REXP representing the body of the function.

environment

Returns a reference to the enclosing evaluation frame, i.e., the environment within which the function is defined and looks up any free variables. This attribute is optional because some serialization mechanisms (notably Rserve's QAP), do not save the closure's environment.

to_pl

Closures do not have a native Perl representation and trying to call this access will raise an exception.

BUGS AND LIMITATIONS

Classes in the REXP hierarchy are intended to be immutable. Please do not try to change their value or attributes.

There are no known bugs in this module. Please see Statistics::R::IO for bug reporting.

SUPPORT

See Statistics::R::IO for support and contact information.

AUTHOR

Davor Cubranic <cubranic@stat.ubc.ca>

COPYRIGHT AND LICENSE

This software is Copyright (c) 2014 by University of British Columbia.

This is free software, licensed under:

  The GNU General Public License, Version 3, June 2007