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Showing content from https://timsong-cpp.github.io/cppwp/n4140/class.nested.type below:

[class.nested.type]

1

Type names obey exactly the same scope rules as other names. In particular, type names defined within a class definition cannot be used outside their class without qualification. [ Example:

struct X {
  typedef int I;
  class Y { /* ... */ };
  I a;
};

I b;                            // error
Y c;                            // error
X::Y d;                         // OK
X::I e;                         // OK

 — end example ]


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