Please restore our registers when you’re done with them(randomascii.wordpress.com)

    void foo(std::unique_ptr<int> ptr) {}
    void bar(std::unique_ptr<int>&& ptr) {}

    int main()
    {
        std::unique_ptr<int> p1{new int{1}};
        std::unique_ptr<int> p2{new int{2}};

        foo(std::move(p1));
        assert(p1 == nullptr);

        bar(std::move(p2));
        assert(p2 != nullptr);
     }