A member class of a class template may be defined outside the class template definition in which it is declared. [ Note: The member class must be defined before its first use that requires an instantiation ([temp.inst]). For example,
template<class T> struct A {
class B;
};
A<int>::B* b1; template<class T> class A<T>::B { };
A<int>::B b2;
— end note ]
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