How to get full name of a type in clang with python?

Question

Tried to get full name of the type of member variable or params variable. For example, private B* b should give nm::B* and void f(B& var) should give void (nm::B&)

namespace nm{
class B;


}
using namespace nm;
class A{
private B* b;
};

void f(B& var);

Here is an example to get full name of function, but without variable full name.