playera.rb

require 'alias_dci'
class Player < Struct.new(:name)
  include AliasDCI::DataObject
  
  def foo
    puts "Player's foo"
  end
end

class TestContext
  include AliasDCI::Context
  
  role :a do
    def foo
     puts "A's Foo" 
    end
  end
  
  role :b
  
  def initialize(player)
    assign_named_roles(:a => player, :b => player)
  end
  
  def call
    in_context do
      a.foo
      r_b.foo  #explicitly call #foo through b
    end
  end
end

TestContext.new(Player.new).call

# => nil
# >> A's Foo
# >> Player's foo