Decltype and member function (not pointer) type?

The code is ill-formed: there are only a few ways that a member function name (e.g. C::Foo ) can be used, and this is not one of them (the complete list of valid uses can be found in the C++ language standard, see C++11 §5.1. 1/12).

It's no type, since using just C::Foo is ill-formed.

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