[ruby-core:79190] [Ruby trunk Feature#9992] Access Modifiers (Internal Interfaces)

Issue #9992 has been updated by Daniel Ferreira.


Matthew Draper presented a feature request to [extended 'protected' access modifier](https://bugs.ruby-lang.org/issues/12962) that comes in line with my current proposal.
Matthew presents the problem in a different angle so maybe that will make more understandable the concept of *internal interfaces*.

What is your opinion?

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Feature #9992: Access Modifiers (Internal Interfaces)
https://bugs.ruby-lang.org/issues/9992#change-62614

* Author: Daniel Ferreira
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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Hi,
 
I’m would like to discuss with you the concept of Internal Interfaces.
 
Currently ruby offers three access modifiers choices to set methods visibility:

- public
- protected
- private

Public methods define what we may call the Public Interface.
Private methods are private to the class and its subclasses.
Protected methods are public for the subclasses.
 
I would like to work with a new access modifier that would allow the creation of Internal methods.
 
Internal methods would be object methods that could only be called within the namespace.
 
Ex:

~~~ruby
module Foo; end

class Foo::Bar
  def baz 
     puts ‘baz’
  end
  internal :baz
end

class Foo::Qux
  def baz
     ::Foo::Bar.new.baz
  end
end
~~~

Is this something that we can think about in a future implementation of ruby?
An extra feature that would not break backward compatibility.
 
Cheers,
Daniel



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