C++ 原子操作 std::atomic＜T＞

class Test
{
public:    
    Test() = default;

    void CThreadFunc()
    {
        for (int i = 0; i < 10000; ++i)
        {
            //std::lock_guard lck(Test::m_s_ivalue_mutex); //m_iValue需要加锁才可正常工作
            m_iValue++;

            m_atomic_value++;//不加锁，也可正常工作
        }
    }

    void Start()
    {
        std::vector threads;
        for (int i = 0; i < 10; ++i)
        {
            threads.push_back(std::thread(&Test::CThreadFunc, this));
        }

        for (auto& th : threads)
        {
            if (th.joinable())
            {
                th.join();
            }
        }　　　　 std::cout << "m_iValue:" << m_iValue << ", m_atomic_value:" << m_atomic_value << std::endl;
    }

private:
    int m_iValue = 0;
    std::atomic m_atomic_value = 0;//sta::atomic 原子操作
    static std::mutex m_s_ivalue_mutex;
};