Class: Stream::EmptyStream

Inherits:
BasicStream show all
Includes:
Singleton
Defined in:
lib/stream.rb

Overview

A Singleton class for an empty stream. EmptyStream.instance is the sole instance which answers true for both at_end? and at_beginning?

Instance Method Summary collapse

Methods included from Stream

#+, #backward, #collect, #concatenate, #concatenate_collected, #create_stream, #current, #current_edge, #each, #empty?, #filtered, #first, #forward, #last, #modify, #move_backward_until, #move_forward_until, #peek, #remove_first, #remove_last, #reverse, #set_to_begin, #set_to_end, #unwrapped

Methods included from Enumerable

#create_stream

Instance Method Details

#at_beginning? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/stream.rb', line 172

def at_beginning?
  true
end

#at_end? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/stream.rb', line 168

def at_end?
  true
end

#basic_backward ⇒ Object

Raises:



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# File 'lib/stream.rb', line 180

def basic_backward
  raise EndOfStreamException
end

#basic_forward ⇒ Object

Raises:



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# File 'lib/stream.rb', line 176

def basic_forward
  raise EndOfStreamException
end