C++线程函数通过引用传递

Question

我想知道如何添加一个通过引用传递给线程的函数。整数示例在 Internet 上很容易找到，但找不到任何通过引用传递的示例？

    #include <iostream>
    #include <thread>

    void add(int a, int b)
    {

        std::cout <<  a + b << std::endl;

    }

    void sub(int c, int d) {
        std::cout<< c - d << std::endl;
    }

    void addp(int &a1, int &a2) {
        std::cout << a1 + a2 << std::endl;
    }

    int main() {
        int number1 = 25;
        int number2 = 50;
        toplamap(number1, number2);
        std::thread first(add, 10, 29);
        std::thread second(sub, 29, 10);
        std::thread third(addp, number1, number2);
        first.join();
        second.join();
        third.join();

        return 0;
    }

Answer 1

解决方案1：使用std::ref：

    int number1 = 25;
    int number2 = 50;
    std::thread third(addp, std::ref(number1), std::ref(number2));

解决方案 2：使用 lambda：

    int number1 = 25;
    int number2 = 50;
    std::thread third([&] { addp(number1, number2); });