如何向list<shared_ptr<Abstract>>添加值

#include <iostream>
#include <list>
#include <memory>

class Abstract {
public:
    virtual void foo() = 0;
};

class Concrete : public Abstract {
public:
    void foo() override {
        std::cout << "Concrete::foo()" << std::endl;
    }
};

int main() {
    std::list<std::shared_ptr<Abstract>> myList;

    std::shared_ptr<Abstract> ptr = std::make_shared<Concrete>();
    myList.push_back(ptr);

    return 0;
}