Class: Piggly::Util::Thunk

Inherits:
BlankSlate show all
Defined in:
lib/piggly/util/thunk.rb

Overview

Wraps a computation and delays its evaluation until a message is sent to it. Computation can be forced by calling ‘force!`

Instance Method Summary collapse

Methods inherited from BlankSlate

find_hidden_method, hide, reveal

Constructor Details

#initialize(&block) ⇒ Thunk

Returns a new instance of Thunk.



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# File 'lib/piggly/util/thunk.rb', line 17

def initialize(&block)
  @block = block
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *args, &block) ⇒ Object 



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# File 'lib/piggly/util/thunk.rb', line 34

def method_missing(name, *args, &block)
  force!.send(name, *args, &block)
end

Instance Method Details

#force! ⇒ Object 



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# File 'lib/piggly/util/thunk.rb', line 21

def force!
  unless @block.nil?
    @value = @block.call
    @block = nil
  end

  @value
end

#thunk? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/piggly/util/thunk.rb', line 30

def thunk?
  true
end