如何无限循环执行协程，相当于协程内部循环？

Question

假设我有一个协程函数，其主体中有一个

co_await

运算符等待事件，如下所示：

auto coro = [&]()->coroutine {
    co_await evt;
    std::cerr << "event was triggered\n";
};

我需要编写一个函数

void forever(auto&&)

，它接受一个协程（

forever(coro);

）并在无限循环中执行它，与体内具有无限循环的协程具有相同的效果，即

auto forever_coro = [&]->coroutine {
    for(auto counter = 1;;++counter) {
        co_await evt;
        std::cerr << "event was triggered " << counter << " time(s)\n";
    }
};

这是一个演示

Answer 1

auto forever_coro = [&]->coroutine {
    for(auto counter = 1;;++counter) {
        co_await evt;
        std::cerr << "event was triggered " << counter << " time(s)\n";
        counter=counter-1;
    }
};