If xxx() is a member function of RThread, then a useful technique for calling this function on the current thread is simply to call:

RThread().xxx();

For example, the current thread's id can be found with:

RThread().Id(); // compiler creates an unnamed temporary RThread object.

or:

RThread currentThread(); // we name the object ourselves if we plan to make lots of calls.
currentThread.Id();

Substitute RProcess for RThread if you want the current process instead of the current thread.