Bug #12216: Class inherited Singleton method exclude argument from protected method accessing

• Status: Rejected
• Assignee: -
• Target version: -
• ruby -v: 1.8.7-p375 && 1.9 && 2.+
• Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN

[adamluzsi (Adam Luzsi)]

Dear Ruby Lang developers.

I would like to ask about why the following code can work?

Or is it a valid scenario and "as expected" behavior to ignore public call on a protected method.

Thank you guys for the brilliant!

class A
  class << self
    def inherited(klass)
      p klass.protected_method_call
    end

    protected
    def protected_method_call
      self.to_s
    end
  end
end

class B < A
end

# output: "B"

[nobu (Nobuyoshi Nakada)]

• Description updated (diff)
• Status changed from Open to Rejected

Expected behavior.
In the inherited method, self and klass are A and B respectively, which are instances of Class.
Protected methods can be called from a same class instance.

[adamluzsi (Adam Luzsi)]

Nobuyoshi Nakada wrote:

Expected behavior.
In the inherited method, self and klass are A and B respectively, which are instances of Class.
Protected methods can be called from a same class instance.

Thank you very much!
My mistake, I mixed up with the private scope.
I'm terrible sorry for this.

Best regards,
Adam L.

[adamluzsi (Adam Luzsi)]

Nobuyoshi Nakada wrote:

Protected methods can be called from a same class instance.

So far I though, A and B is a different class instance, just they are in inheritance relationship.

But I see now,
class instance != object instance
class instance is based on inheritance