83. Smart Pointers-II
Question.3
Two objects hold shared_ptrs to each other:
struct A { std::shared_ptr<B> b_ptr; };
struct B { std::shared_ptr<A> a_ptr; };
auto a = std::make_shared<A>();
auto b = std::make_shared<B>();
a->b_ptr = b;
b->a_ptr = a;
// Both go out of scope...What happens when a and b go out of scope?