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Bug #9815

closed

attr_reader doesn't warn on a uninitialized instance variable

Bug #9815: attr_reader doesn't warn on a uninitialized instance variable

Added by ko1 (Koichi Sasada) about 12 years ago. Updated almost 6 years ago.

Status:
Rejected
Assignee:
matz (Yukihiro Matsumoto)
Target version:
-
ruby -v:
confirmed by 1.9.3-2.2.0
Backport:
2.0.0: UNKNOWN, 2.1: UNKNOWN
[ruby-dev:48184]
Tags:
core, notbug

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) about 12 years ago Actions
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 #1 [ruby-dev:48185]

  • Status changed from Open to Closed

意図的なものです。
rb_ivar_getとrb_attr_getの差です。

Updated by ko1 (Koichi Sasada) about 12 years ago Actions
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 #2 [ruby-dev:48187]

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) about 12 years ago Actions
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 #3 [ruby-dev:48364]

  • Status changed from Closed to Feedback

Updated by naruse (Yui NARUSE) over 8 years ago Actions
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 #4

  • Target version deleted (2.2.0)

Updated by ko1 (Koichi Sasada) over 6 years ago Actions
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 #5

  • Status changed from Feedback to Rejected

Updated by Eregon (Benoit Daloze) almost 6 years ago Actions
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 #6 [ruby-dev:50954]

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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