初始化列表中的对象初始化问题

I have the following code:

我有以下代码：

    class A {
        public: 
        A(std::vector<std::shared_ptr<int>>){}
    };

    auto x = std::make_shared<int>(0);
    auto y = std::make_shared<int>(1);

    auto list = {x, y};
    auto res = std::make_shared<A>({x, y});
    clas