Method submit

include/workspace/workspace.hpp:225–234

    template <typename T = task::nor, typename F, typename R = details::result_of_t<F>,
              typename DR = typename std::enable_if<std::is_void<R>::value>::type>
    void submit(F&& task) {
        assert(branches.size() > 0);
        auto this_br = cur->get();
        auto next_br = forward(cur)->get();
        if (next_br->num_tasks() < this_br->num_tasks()) {
            next_br->submit<T>(std::forward<F>(task));
        } else {
            this_br->submit<T>(std::forward<F>(task));
        }
    }
    /**
     * @brief async execute a task
     * @tparam T task type