Functor

By definition a Functor is simply a first class method, but these are common in the form of Method and Proc. So here a Functor is a bit more specialized as a 1st class metafunction. Essentally, a Functor can vary its behavior accorrding to the operation applied to it.

Synopsis

  f = Functor.new { |op, x| x.send(op, x) }
  f + 1  #=> 2
  f + 2  #=> 4
  f + 3  #=> 6
  f * 1  #=> 1
  f * 2  #=> 2
  f * 3  #=> 9
Methods
Public Class methods
new(*targets, &function)

[ show source ]

# File lib/facets/more/functor.rb, line 44
  def initialize(*targets, &function)
    @targets = targets
    @function = function
  end
Public Instance methods
instance_function()

[ show source ]

# File lib/facets/more/functor.rb, line 59
  def instance_function; @function ; end
instance_objects()

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# File lib/facets/more/functor.rb, line 58
  def instance_objects ; @targets ; end
instance_targets()

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# File lib/facets/more/functor.rb, line 57
  def instance_targets ; @targets ; end
method_missing(op, *args, &blk)

[ show source ]

# File lib/facets/more/functor.rb, line 49
  def method_missing(op, *args, &blk)
    if block_given?
      @function.call(op, *(@targets + args), &blk)
    else
      @function.call(op, *(@targets + args))
    end
  end