#### experimental::make_parallel_group (1 of 3 overloads)

Create a group of operations that may be launched in parallel.

    template<
        typename... Ops>
    parallel_group< Ops...> make_parallel_group(
        Ops... ops);

For example:

    asio::experimental::make_parallel_group(
       [&](auto token)
       {
         return in.async_read_some(asio::buffer(data), token);
       },
       [&](auto token)
       {
         return timer.async_wait(token);
       }
     ).async_wait(
       asio::experimental::wait_for_all(),
       [](
           std::array<std::size_t, 2> completion_order,
           std::error_code ec1, std::size_t n1,
           std::error_code ec2
       )
       {
         switch (completion_order[0])
         {
         case 0:
           {
             std::cout << "descriptor finished: " << ec1 << ", " << n1 << "\n";
           }
           break;
         case 1:
           {
             std::cout << "timer finished: " << ec2 << "\n";
           }
           break;
         }
       }
     );