Boost.Random: Missing definitions of to static constants

The class template xor_combine<> from xor_combine.hpp declares 3 static constant members has_fixed_range (bool), shift1 (int), and shift2 (int), but **defines** only has_fixed_range. I propose, that proper definitions for shift1 and shift2 should be provided in the already existing BOOST_NO_INCLASS_MEMBER_INITIALIZATION block, too. Greetings from Bremen, Daniel Krügler