Question

Is the following valid?:

template<typename T> class C { C1<C2<T>> someMember; };

Answer 1

Well, you’d need to do something with the type, either make it a typedef or member, but yes:

template <typename T>
struct C1 {};

template <typename T>
struct C2 {};

template <typename T>
struct C
{
    typedef C1<C2T> > type; // note the space!
};

>> is actually the right shift operator, so you need a space in there for it to work correctly. In C++0x, however, you can just type >>; it is parsed just fine.*

_{*Some lenient compilers will currently accept it.}