将带参数的函数传递给线程中运行的函数的C++11

#include <iostream>
#include <thread>

void print_sum(int a, int b) {
    std::cout << "Sum: " << a + b << std::endl;
}

int main() {
    int x = 5, y = 7;
    std::thread t(print_sum, x, y);
    t.join();
    return 0;
}

#include <iostream>
#include <thread>

class Sum {
public:
    Sum(int a, int b) : a_(a), b_(b) {}
    void operator()() const {
        std::cout << "Sum: " << a_ + b_ << std::endl;
    }
private:
    int a_, b_;
};

int main() {
    int x = 5, y = 7;
    Sum s(x, y);
    std::thread t(s);
    t.join();
    return 0;
}

#include <iostream>
#include <thread>

int main() {
    int x = 5, y = 7;
    std::thread t([x, y]() {
        std::cout << "Sum: " << x + y << std::endl;
    });
    t.join();
    return 0;
}