From: Aaron Patterson <aaron@...>
Date: 2011-01-28T07:14:35+09:00
Subject: [ruby-core:34909] Re: [Ruby 1.9-Feature#4326][Open] Fiber should respond to call() and []


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On Thu, Jan 27, 2011 at 01:07:33PM +0900, Nobuyoshi Nakada wrote:
> Hi,
>=20
> At Wed, 26 Jan 2011 16:08:52 +0900,
> Aaron Patterson wrote in [ruby-core:34861]:
> > Fibers are considered to be coroutines.  Knuth says
> > "Subroutines are special cases of ... coroutines".  This
> > makes sense to me.
>=20
> Do you mean
>   "A is kind of B, A has a feature X, therefore B also should
>   have X",
> but not
>   "A is kind of B, B has a feature X, therefore A also should
>   have X"?
>=20
> Sounds strange to me.

Maybe code will be more clear.  I want to do this:

    def square block
      block.call ** 2
    end
   =20
    callables =3D [
      lambda { 10 },
      Fiber.new { Fiber.yield 10 }
    ]
   =20
    callables.map { |thing| square thing }

Instead I have to do this:

    def square block
      value =3D block.is_a?(Fiber) ? block.resume : block.call
      value ** 2
    end
   =20
    callables =3D [
      lambda { 10 },
      Fiber.new { Fiber.yield 10 }
    ]
   =20
    callables.map { |thing| square thing }

--=20
Aaron Patterson
http://tenderlovemaking.com/

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