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Class: Rake::LinkedList::EmptyLinkedList

Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Subclasses:
InvocationChain::EmptyInvocationChain
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, ::Rake::LinkedList
Instance Chain:
self, ::Rake::LinkedList, Enumerable
Inherits: Rake::LinkedList
Defined in: lib/rake/linked_list.rb

Overview

Represent an empty list, using the Null Object Pattern.

When inheriting from the ::Rake::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).

Constant Summary

::Rake::LinkedList - Inherited

EMPTY

Class Method Summary

::Rake::LinkedList - Inherited

.cons

Cons a new head onto the tail list.
.empty

The standard empty list class for the given ::Rake::LinkedList class.
.make

Make a list out of the given arguments.
.new

Instance Attribute Summary

::Rake::LinkedList - Inherited

#empty?

Is the list empty? make guards against a list being empty making any instantiated ::Rake::LinkedList object not empty by default You should consider overriding this method if you implement your own make method.
#head, #tail

Instance Method Summary

::Rake::LinkedList - Inherited

#==

Lists are structurally equivalent.
#conj

Polymorphically add a new element to the head of a list.
#each

For each item in the list.
#inspect

Same as #to_s, but with inspected items.
#to_s

Convert to string: LL(item, item…).

Constructor Details

.new ⇒ EmptyLinkedList

[ GitHub ] 

  


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



def initialize
end


  







Class Method Details



  

    .cons(head, tail)  
  

  [ GitHub ]


  

  


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



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


  







Instance Attribute Details



  

    #empty?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


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



def empty?
  true
end