How to forward declare templated type that should belong to a class?

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Assume I have 2 classes:

class A
{
public:
  typedef std::shared_ptr<A> Ref;
  ...

private:
  B::Ref _b;
}

class B
{
public:
  typedef std::shared_ptr<B> Ref;
  ...

private:
  A::Ref _a;
}

This obviously requires forward declaration of class B and B::Ref. Forward declaring B is simple, but how to do that for B::Ref too?

asked 1 min ago

Mike Lischke

4,637

How to forward declare templated type that should belong to a class?