CPP13 — questions to IDL - C++ mapping ( CORBA 2.3, valuebox)

I have the following questions to IDL - C++ mapping CORBA 2.3 (concerning valueboxes).
Can somebody give me an answer?

1. I assume that valueboxes T as a special kind of valuetypes also
need in C++ the T_var and the T_out types and the T_out types will be
used in function signatures for IDL out-parameters. Is it true?

2. The mapping for strings and wstrings requires a definition of C++
operators << and >> to allow a use of strings (wstrings) with the c++ iostreams.
What about valueboxes of strings (wstrings) - chapter 1.17.7.4?
Is it required to define (in C++) the operators <<, >> to use T_var and T_out
with C++ iostreams, where T is a type for a valuebox T of string (wstring)?