Class: Rake::LinkedList::EmptyLinkedList

Inherits:

Rake::LinkedList

• Object
• Rake::LinkedList
• Rake::LinkedList::EmptyLinkedList

Defined in:

lib/rake/linked_list.rb

Overview

Represent an empty list, using the Null Object Pattern.

When inheriting from the LinkedList class, you should implement a type specific Empty class as well. Make sure you set the class instance variable @parent to the associated list class (this allows conj, cons and make to work polymorphically).

Direct Known Subclasses

InvocationChain::EmptyInvocationChain

Instance Attribute Summary

Attributes inherited from Rake::LinkedList

#head, #tail

Class Method Summary

• .cons(head, tail) ⇒ Object

Instance Method Summary

• #empty? ⇒ Boolean
• #initialize ⇒ EmptyLinkedList constructor

  A new instance of EmptyLinkedList.

Methods inherited from Rake::LinkedList

#==, #conj, #each, empty, #inspect, make, #to_s

Constructor Details

#initialize ⇒ EmptyLinkedList

Returns a new instance of EmptyLinkedList.

# File 'lib/rake/linked_list.rb', line 98

def initialize
end

Class Method Details

.cons(head, tail) ⇒ Object

# File 'lib/rake/linked_list.rb', line 105

def self.cons(head, tail)
  @parent.cons(head, tail)
end

Instance Method Details

#empty? ⇒ Boolean

Returns:

• (Boolean)

# File 'lib/rake/linked_list.rb', line 101

def empty?
  true
end