`std::thread`???????

??????C++???????????std::thread??????????????????????????std::thread??????????????

??????????

std::thread???????????????????

?????????????????????????

?????????????????????????

???????????????????????????????????????

?????????

????????????????????????join?detach????????????????????????????????

RAII?????

??????????????ThreadRAII????????????????????

???

class ThreadRAII {
public:
    enum class DtorAction { join, detach };
    ThreadRAII(std::thread&& t, DtorAction a)
        : action(a), t(std::move(t)) {}
    ~ThreadRAII() {
        if (t.joinable()) {
            if (action == DtorAction::join) {
                t.join();
            } else {
                t.detach();
            }
        }
    }
    std::thread& get() { return t; }
private:
    DtorAction action;
    std::thread t;
};
ThreadRAII::ThreadRAII() = default;
ThreadRAII&& operator=(ThreadRAII&& other) = default;

????

bool doWork(std::function
   
     filter, int maxVal = 10'000'000) {
    std::vector
    
      goodVals;
    ThreadRAII t(std::thread{[&filter, maxVal, &goodVals](int i) {
        for (int i = 0; i <= maxVal; ++i) {
            if (filter(i)) goodVals.push_back(i);
        }
    }), ThreadRAII::DtorAction::join;
    auto nh = t.get().native_handle();
    // ... ??????????
    if (conditionsAreSatisfied()) {
        t.get().join();
        performComputation(goodVals);
        return true;
    }
    return false;
}