这个线程跑不起来，感觉是bind写错了,但不知道错哪了

Question

#include <iostream>
#include<Windows.h>
#include<thread>
#include<functional>
using namespace std;
class _mythread
{
public:
    void callback(int param)
    {
        for (int i = 0; i < 100; i++)
        {
            g_val++;
            this_thread::sleep_for(chrono::seconds(5));
        }
        cout << "值:" << g_val << "线程id:" << this_thread::get_id() <<"自定义参数为："<<param << endl;
    }
public:
    int g_val = 0;
};

int main()
{
    _mythread th1;
    thread st(bind(&_mythread::callback,&th1,123 ));
    st.join();
    system("pause");
}

Answer 1

你的循环里线程挂起5秒钟，那么100此就要有500秒，所以要接近10分钟后你才能看到输出