Function parallel_sort_impl

example/cpp14/parallel_group/parallel_sort.cpp:33–70

    typename Executor,
    typename RandomAccessIterator>
void parallel_sort_impl(
    Executor executor,
    RandomAccessIterator begin,
    RandomAccessIterator end,
    std::function<void()> continuation)
{
    std::size_t n = end - begin;
    if (n <= 16384)
    {
      boost::asio::post(executor,
          [=]
          {
            std::sort(begin, end);
            continuation();
          }
        );
    }
    else
    {
      boost::asio::experimental::make_parallel_group(
          [=](auto token)
          {
            return parallel_sort(executor, begin, begin + n / 2, token);
          },
          [=](auto token)
          {
            return parallel_sort(executor, begin + n / 2, end, token);
          }
        ).async_wait(
          boost::asio::experimental::wait_for_all(),
          [=](std::array<std::size_t, 2>)
          {
            std::inplace_merge(begin, begin + n / 2, end);
            continuation();
          }
        );
    }
}

template <
    typename Executor,