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Man Pages


Manual Reference Pages  -  DATA::OBJECT::UNDEF (3)

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NAME

Data::Object::Undef - Undef Object for Perl 5

CONTENTS

VERSION

version 0.59

SYNOPSIS



    use Data::Object::Undef;

    my $undef = Data::Object::Undef->new(undef);



DESCRIPTION

Data::Object::Undef provides routines for operating on Perl 5 undefined data. Undef methods work on undefined values.

COMPOSITION

This package inherits all functionality from the Data::Object::Role::Undef role and implements proxy methods as documented herewith.

METHODS

    data



    # given $undef

    $undef->data; # original value



The data method returns the original and underlying value contained by the object. This method is an alias to the detract method.

    defined



    # given undef

    $undef->defined ? Yes : No; # No



The defined method always returns false. This method returns a Data::Object::Number object.

    detract



    # given $undef

    $undef->detract; # original value



The detract method returns the original and underlying value contained by the object.

    dump



    # given $undef

    $undef->dump; # undef



The dump method returns returns a string representation of the object. This method returns a Data::Object::String object.

    eq



    # given $undef

    $undef->eq; # exception thrown



This method is a consumer requirement but has no function and is not implemented. This method will throw an exception if called.

    ge



    # given $undef

    $undef->ge; # exception thrown



This method is a consumer requirement but has no function and is not implemented. This method will throw an exception if called.

    gt



    # given $undef

    $undef->gt; # exception thrown



This method is a consumer requirement but has no function and is not implemented. This method will throw an exception if called.

    le



    # given $undef

    $undef->le; # exception thrown



This method is a consumer requirement but has no function and is not implemented. This method will throw an exception if called.

    lt



    # given $undef

    $undef->lt; # exception thrown



This method is a consumer requirement but has no function and is not implemented. This method will throw an exception if called.

    methods



    # given $undef

    $undef->methods;



The methods method returns the list of methods attached to object. This method returns a Data::Object::Array object.

    ne



    # given $undef

    $undef->ne; # exception thrown



This method is a consumer requirement but has no function and is not implemented. This method will throw an exception if called.

    new



    # given undef

    my $undef = Data::Object::Undef->new(undef);



The new method expects an undefined value and returns a new class instance.

    print



    # given $undef

    $undef->print; # undef



The print method outputs the value represented by the object to STDOUT and returns true. This method returns a Data::Object::Number object.

    roles



    # given $undef

    $undef->roles;



The roles method returns the list of roles attached to object. This method returns a Data::Object::Array object.

    say



    # given $undef

    $undef->say; # undef\n



The say method outputs the value represented by the object appended with a newline to STDOUT and returns true. This method returns a Data::Object::Number object.

    throw



    # given $undef

    $undef->throw;



The throw method terminates the program using the core die keyword, passing the object to the Data::Object::Exception class as the named parameter object. If captured this method returns a Data::Object::Exception object.

    type



    # given $undef

    $undef->type; # UNDEF



The type method returns a string representing the internal data type object name. This method returns a Data::Object::String object.

ROLES

This package is comprised of the following roles.
o Data::Object::Role::Comparison
o Data::Object::Role::Defined
o Data::Object::Role::Detract
o Data::Object::Role::Dumper
o Data::Object::Role::Item
o Data::Object::Role::Output
o Data::Object::Role::Throwable
o Data::Object::Role::Type
o Data::Object::Role::Value

SEE ALSO

o Data::Object::Array
o Data::Object::Class
o Data::Object::Class::Syntax
o Data::Object::Code
o Data::Object::Float
o Data::Object::Hash
o Data::Object::Integer
o Data::Object::Number
o Data::Object::Role
o Data::Object::Role::Syntax
o Data::Object::Regexp
o Data::Object::Scalar
o Data::Object::String
o Data::Object::Undef
o Data::Object::Universal
o Data::Object::Autobox
o Data::Object::Immutable
o Data::Object::Library
o Data::Object::Prototype
o Data::Object::Signatures

AUTHOR

Al Newkirk <anewkirk@ana.io>

COPYRIGHT AND LICENSE

This software is copyright (c) 2014 by Al Newkirk.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

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perl v5.20.3 DATA::OBJECT::UNDEF (3) 2015-11-29

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