Function reduce_task

example/multi_fan_out.cpp:24–30

template<typename T>
task<void> reduce_task(task<T> all_task) {
    auto results = co_await all_task;
    constexpr size_t n = std::tuple_size_v<T>;
    size_t sum_size = 0;
    mpl::static_for<0, n>([&](auto i) { sum_size += std::get<i>(results); });
    std::cout << "reduce_task(): total bytes: " << sum_size << "\n";
}

int main() {
    io_context ctx;