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Bug #9815

closed

attr_reader doesn't warn on a uninitialized instance variable

Added by ko1 (Koichi Sasada) over 10 years ago. Updated about 4 years ago.

Status:
Rejected
Target version:
-
ruby -v:
confirmed by 1.9.3-2.2.0
[ruby-dev:48184]
Tags:

Description

attr_reader で定義したメソッドでは、-w 時に、未設定の警告「warning: instance variable @bar not initialized」みたいなのが出ないんですが、そういうもんでしょうか。

class C
  attr_reader :foo
  def bar; @bar; end
end
C.new.foo
C.new.bar #=> t.rb:4: warning: instance variable @bar not initialized

この例では、foo と bar は、同じ意味だと思って居たのでびっくりした次第です。

Updated by nobu (Nobuyoshi Nakada) over 10 years ago

  • Status changed from Open to Closed

意図的なものです。
rb_ivar_getrb_attr_getの差です。

Updated by ko1 (Koichi Sasada) over 10 years ago

どういう意図でしたっけ。
ちょっとググったけど見当たらず。

Updated by usa (Usaku NAKAMURA) over 10 years ago

  • Status changed from Closed to Feedback
Actions #4

Updated by naruse (Yui NARUSE) almost 7 years ago

  • Target version deleted (2.2.0)
Actions #5

Updated by ko1 (Koichi Sasada) almost 5 years ago

  • Status changed from Feedback to Rejected

Updated by Eregon (Benoit Daloze) about 4 years ago

What was the rationale here to have different behavior?

Which C function is used by attr_reader seems an implementation detail.

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