From: Nobuyoshi Nakada <nobu@...>
Date: 2011-01-13T08:57:41+09:00
Subject: [ruby-core:34451] Re: [Ruby 1.9-Feature#4254][Open] Allow method transplanting

Hi,

At Thu, 13 Jan 2011 01:48:33 +0900,
Jonas Pfenniger (zimbatm) wrote in [ruby-core:34444]:
> I agree with matz. If it's something we want for the next releases,
> then it should not break anything. Having transplantable Module
> methods already unlocks lots of scenarios, where a module can act as a
> bag of methods. For example it allows using methods with
> define_method, which allows having regular argument-passing, in
> contract with blocks, which capture the current context and don't
> allow a block as argument. This in turn allows
> to find new patterns that can replace alias_method_chain. If we have that,
> then it's already wonderful.

1.9 already allows a block having block-passing.

  class A
    def foo
      yield "A"
    end
  end

  class B < A
    a_foo = instance_method(:foo)
    define_method(:foo) do |&block|
      a_foo.bind(self).call {|s| block.call(s+"B")}
    end
  end

  B.new.foo {|x|p x} #=> "AB"

-- 
Nobu Nakada