gistfile1.rb

class CallLogged
  def hey
    puts 'hey'
  end

  def double(i)
    i*2
  end

  public_instance_methods(false).each do |method|
    alias_method :"#{method}_without_logging", method
    define_method(method) do |*args|
      puts "#{method}(#{args.inspect.gsub(/^\[|\]$/, '')})"
      send "#{method}_without_logging", *args
    end
  end
end