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Contents
# = Functor
#
# = Synopsis
#
# By definition a Functor is simply a first class method, but these are common
# in the form of Method and Proc. So for Ruby a Functor is a bit more specialized
# as a Higher-order function or Metafunction. Essentally, a Functor can vary
# its behavior accorrding to the operation applied to it.
#
# f = Functor.new { |op, x| x.send(op, x) }
# f + 1 #=> 2
# f + 2 #=> 4
# f + 3 #=> 6
# f * 1 #=> 1
# f * 2 #=> 4
# f * 3 #=> 9
#
# == Author
#
# * Thomas Sawyer
#
# == History
#
# * 2006-11-04 trans Deprecated #functor_function, renamed to #to_proc.
# * 2006-11-04 trans All methods are now private except __ and #binding.
#
# == Todo
#
# * Consider renaming Functor to... ?
#
# == Copying
#
# Copyright (c) 2004 Thomas Sawyer
#
# Ruby License
#
# This module is free software. You may use, modify, and/or redistribute this
# software under the same terms as Ruby.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.
# By definition a Functor is simply a first class method, but these are common
# in the form of Method and Proc. So for Ruby a Functor is a more specialized
# as a Higher-order function or Metafunction. Essentally, a Functor can vary
# its behavior accorrding to the operation applied to it.
#
# f = Functor.new { |op, x| x.send(op, x) }
# f + 1 #=> 2
# f + 2 #=> 4
# f + 3 #=> 6
# f * 1 #=> 1
# f * 2 #=> 4
# f * 3 #=> 9
#
class Functor
# Privatize all methods except vital methods and #binding.
private(*instance_methods.select { |m| m !~ /(^__|^binding$)/ })
def initialize(&function)
@function = function
end
def to_proc
@function
end
# Any action against the functor is processesd by the function.
def method_missing(op, *args, &blk)
@function.call(op, *args, &blk)
end
end
Version data entries
17 entries across 17 versions & 2 rubygems