inherited_hook.rb

class Foo
  puts "in Foo's body"
  
  def self.inherited(subclass)
    puts "inherited #{subclass}"
  end
end

class Bar < Foo
  puts "in Bar's body" # after inherited
end

baz = Class.new(Foo) do
  puts "in baz's body" # before inherited
end

quux = Class.new(Foo)
quux.class_eval do
  puts "in quux's body" # after inherited
end