Vector迭代器的多个线程

#include<vector>
#include <mutex>
#include<thread>

std::vector<int> vec;
std::mutex mtx;

void push_back(int value) {
    std::lock_guard<std::mutex> lock(mtx);
    vec.push_back(value);
}

void print_vector() {
    std::lock_guard<std::mutex> lock(mtx);
    for (auto& v : vec) {
        std::cout << v << " ";
    }
    std::cout<< std::endl;
}

int main() {
    std::thread t1(push_back, 1);
    std::thread t2(push_back, 2);
    std::thread t3(print_vector);

    t1.join();
    t2.join();
    t3.join();

    return 0;
}