Moving template method to .cpp misses template argument list

When moving the definition of method of a class template to its .cpp file I get:

template<typename T>
void Optional::Void()
{

}

But this does not compile. I should get:

template <typename T>
void Optional<T>::Void()
{

}

Also it would nice if template definition are moved to the .inl file (if one exists) instead of .cpp but I am not sure if this is possible.