C++多线程编程：std::thread使用教程

#include 
#include 

void say_hello() {
    std::cout << "Hello from thread!" << std::endl;
}

int main() {
    std::thread t(say_hello);  // 启动线程执行say_hello
    t.join();                  // 等待线程结束
    return 0;
}

#include 
#include 

void print_value(int& x) {
    x = 42;
    std::cout << "Inside thread: x = " << x << std::endl;
}

int main() {
    int value = 10;
    std::thread t(print_value, std::ref(value));  // 必须用std::ref才能传引用
    t.join();
    std::cout << "After thread: x = " << value << std::endl;  // 输出42
    return 0;
}

#include 
#include 

int main() {
    auto task = []() {
        std::cout << "Lambda thread running!" << std::endl;
    };

    std::thread t(task);
    t.join();
    return 0;
}

std::thread t([](){
    std::cout << "Inline lambda thread!" << std::endl;
});
t.join();

std::thread t([]{
    for(int i = 0; i < 5; ++i)
        std::cout << "Detached thread: " << i << std::endl;
});
t.detach();  // 分离线程
// 主线程可能很快结束，注意输出可能不完整