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module RDF; module Util
module Aliasing
##
# Helpers for late-bound instance method aliasing.
#
# Anything that extends this module will obtain an `alias_method` class
# method that creates late-bound instance method aliases instead of the
# default early-bound aliases created by Ruby's `Module#alias_method`.
#
# This is useful because RDF.rb mixins typically alias a number of
# overridable methods. For example, `RDF::Enumerable#count` has the
# aliases `#size` and `#length`. Normally if implementing classes were
# to override the default method, the aliased methods would still be
# bound to the mixin's original reference implementation rather than the
# new overridden method. Mixing in this module into the implementing
# class fixes this problem.
#
# @example Using late-bound aliasing in a module
# module MyModule
# extend RDF::Util::Aliasing::LateBound
# end
#
# @example Using late-bound aliasing in a class
# class MyClass
# extend RDF::Util::Aliasing::LateBound
# end
#
# @see http://en.wikipedia.org/wiki/Name_binding
# @since 0.2.0
module LateBound
##
# Makes `new_name` a late-bound alias of the method `old_name`.
#
# @example Aliasing the `#count` method to `#size` and `#length`
# alias_method :size, :count
# alias_method :length, :count
#
# @param [Symbol, #to_sym] new_name
# @param [Symbol, #to_sym] old_name
# @return [void]
# @see http://ruby-doc.org/core/classes/Module.html#M001653
def alias_method(new_name, old_name)
new_name, old_name = new_name.to_sym, old_name.to_sym
self.__send__(:define_method, new_name) do |*args, &block|
__send__(old_name, *args, &block)
end
return self
end
end # LateBound
end # Aliasing
end; end # RDF::Util
Version data entries
97 entries across 97 versions & 1 rubygems