Class: MutualRecursion::TailCall

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(value = nil, &block) ⇒ TailCall

Returns a new instance of TailCall.



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# File 'lib/mutual_recursion.rb', line 7

def initialize(value = nil, &block)
  @value = value
  @block = block
end

Instance Attribute Details

#block ⇒ Object (readonly)

Returns the value of attribute block.



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# File 'lib/mutual_recursion.rb', line 5

def block
  @block
end

#value ⇒ Object (readonly)

Returns the value of attribute value.



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# File 'lib/mutual_recursion.rb', line 5

def value
  @value
end

Instance Method Details

#invoke ⇒ Object

Invoke this tail call. Only the returned value from the initial call to the recursive function should be invoked.

Returns:

  • (Object) —

    the terminal_value of this tail call



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# File 'lib/mutual_recursion.rb', line 18

def invoke
  self.then do |tail|
    while tail.block
      tail = tail.block.call
      raise MissingTailCallError unless tail.is_a?(TailCall)
    end

    tail.value
  end
end