From: "Michael T. Richter" Date: 2007-08-02T23:19:35+09:00 Subject: Re: What does this warning actually mean? --=-ZWoVUl+CANwj5sEKN/hd Content-Type: multipart/related; type="multipart/alternative"; boundary="=-magQAUUPeda0ol1Xru7M" --=-magQAUUPeda0ol1Xru7M Content-Type: multipart/alternative; boundary="=-Ay3bRzRIfYDpv0KwQTiW" --=-Ay3bRzRIfYDpv0KwQTiW Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Thu, 2007-02-08 at 22:04 +0900, Robert Dober wrote: > Michael I got no clue what you are trying to do here, but maybe the > following is hint enouh, BTW, just do not use class variables ;). > 522/23 > cat test1.rb && ruby test1.rb >=20 > class << self > @@a=3D42 > def a > @@a +=3D1 > end > end > puts a > test1.rb:3: warning: class variable access from toplevel singleton method > test1.rb:5: warning: class variable access from toplevel singleton method > test1.rb:5: warning: class variable access from toplevel singleton method > 43 >=20 > --------------------------------------------- >=20 > 523/24 > cat test2.rb && ruby test2.rb >=20 > class << self > def a > @a||=3D42 > @a+=3D1 > end > end > puts a >=20 >=20 > 43 This much I figured out for myself, Robert. ;) The problem is that I need to share a variable across two functions -- a buffer, to be precise. One function fills the buffer while the other consumes from it. The functions are to be singleton methods on an instantiated IO object. I can't see how to make them share an instance variable without doing funky things like calling instance_variable_set on the object to provide it with said instance variable before adding the singletons. Using a class variable was a desperate test after running headlong into a brick wall trying to share them. As it is now, I've got it working with an additional call to instance_variable_set before defining the singletons, but it looks kind of clunky and I was hoping there was a more elegant approach available. --=20 Michael T. Richter (GoogleTalk: ttmrichter@gmail.com) Our outrage at China notwithstanding, we should remember that before 1891 the copyrights of foreigners were not protected in the United States. (Lawrence Lessig) --=-Ay3bRzRIfYDpv0KwQTiW Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable On Thu, 2007-02-08 at 22:04 +0900, Robert Dober wrote:

Michael I got no clue what you are trying to do her=
e, but maybe the
following is hint enouh, BTW, just do not use class=
 variables ;).
522/23 > cat test1.rb && ruby test1.rb

  class << self
    @@a=3D42
    def a
      @@a +=3D1
    end
  end
  puts a
test1.rb:3: warning: class variable access from top=
level singleton method
test1.rb:5: warning: class variable access from top=
level singleton method
test1.rb:5: warning: class variable access from top=
level singleton method
43

---------------------------------------------

523/24 > cat test2.rb && ruby test2.rb

  class << self
    def a
      @a||=3D42
      @a+=3D1
    end
  end
  puts a


43

This much I figured out for myself, Robert. 3D";)"

The problem is that I need to share a variable across two<= /B> functions -- a buffer, to be precise. One function fills the buff= er while the other consumes from it. The functions are to be singleto= n methods on an instantiated IO object. I can't see how to make them = share an instance variable without doing funky things like calling instance= _variable_set on the object to provide it with said instance variable befor= e adding the singletons. Using a class variable was a desperate test = after running headlong into a brick wall trying to share them.

As it is now, I've got it working with an additional call to instance_varia= ble_set before defining the singletons, but it looks kind of clunky and I w= as hoping there was a more elegant approach available.

--
Michael T. Richter <ttmri= chter@gmail.com> (GoogleTalk: ttmrichter@gmail.com)
Our outrage at China notwithstanding, we should remember that before 189= 1 the copyrights of foreigners were not protected in the United States. (La= wrence Lessig)

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