Alias templates with partial specialization, SFINAE and everything
Alias templates are a new way to do typedefs in C++11. You have probably seen them by now, but as a reminder here is what the standard considers to be an alias-declaration:
template<typename T> using MyVector = std::vector<T, MyAllocator<T>>; // alias-declaration MyVector<T> myvector; // instantiating with MyAllocator;
So that’s cool. Unfortunately the standard also says that “Because an alias-declaration cannot declare a template-id, it is not possible to partially or explicitly specialize an alias template.” (Paragraph 14.5/3) But that would be a terribly useful thing to have.