Class: TreeMap::NodeIterator

Inherits:
Object
  • Object
show all
Defined in:
lib/tree_map/tree_map.rb

Overview

in-order traversal of nodes in tree

Direct Known Subclasses

BoundedMap::BoundedNodeIterator

Instance Method Summary collapse

Constructor Details

#initialize(next_node) ⇒ NodeIterator

Returns a new instance of NodeIterator.



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# File 'lib/tree_map/tree_map.rb', line 625

def initialize(next_node)
  @next_node = next_node
  @last_node = nil
end

Instance Method Details

#has_next? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/tree_map/tree_map.rb', line 630

def has_next?
  !!@next_node
end

#step_backward ⇒ Object 



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# File 'lib/tree_map/tree_map.rb', line 642

def step_backward
  if @next_node
    @last_node = @next_node
    @next_node = @next_node.prev_node
    @last_node
  end
end

#step_forward ⇒ Object 



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# File 'lib/tree_map/tree_map.rb', line 634

def step_forward
  if @next_node
    @last_node = @next_node
    @next_node = @next_node.next_node
    @last_node
  end
end