Yesterday, I found the following code in RSpec:
class OptionParser < ::OptionParser What does this do? What is the difference between this and class OptionParser < NameSpace::OptionParser?
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1 Answer
An runnable example might explain the idea best:
class C def initialize puts "At top level" end end module M class C def initialize puts "In module M" end end class P < C def initialize super end end class Q < ::C def initialize super end end end M::P.new M::Q.new Produces when run:
In module M At top level 
3 Comments
suzukimilanpaak
Thank you. Just let me confirm if my understanding is correct. Is OptionParser refer to OptionParser in the standard library called optparse in my example?
bjg
Exactly. In your example
::OptionParser refers to the standard library class
ARK
Your example is good in terms of "runnability" but too scarce for a newbie :)