C++多线程编程：多线程交替打印数字

#include <iostream>
#include <thread>
#include <mutex>
#include <condition_variable>
const int max_count = 10;
int curr = 1;
std::mutex mtx;
std::condition_variable cv;
bool flag = true;
void print_odd() {
    while (curr < max_count) {
        std::unique_lock<std::mutex> lock(mtx);
        if (!flag) {
            cv.wait(lock);
        }
        std::cout << "Thread 1: " << curr++ << std::endl;
        flag = false;
        cv.notify_all();
    }
}
void print_even() {
    while (curr < max_count) {
        std::unique_lock<std::mutex> lock(mtx);
        if (flag) {
            cv.wait(lock);
        }
        std::cout << "Thread 2: " << curr++ << std::endl;
        flag = true;
        cv.notify_all();
    }
}
int main() {
    std::thread t1(&print_odd), t2(&print_even);
    t1.join();
    t2.join();
    return 0;
}