131. Ownership

Question.5

Two objects reference each other with shared_ptr:

struct A { std::shared_ptr<B> b; };
struct B { std::shared_ptr<A> a; };

auto pa = std::make_shared<A>();
auto pb = std::make_shared<B>();
pa->b = pb;
pb->a = pa;
// pa and pb go out of scope

What happens?

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Memory leak -- the circular reference keeps both alive forever
Both objects are properly destroyed
One object is destroyed; the other is leaked
The compiler detects the cycle and breaks it

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