In my case, I specialized the value_initialized template like this #include<boost/utility/value_init.hpp> namespace boost { namespace vinit_detail { template<class T> class const_T_base<fugu::vector2_t<T> > { protected : const_T_base() : x(0,0) {} fugu::vector2_t<T> x; }; template<class T> struct non_const_T_base<fugu::vector2_t<T> > { protected : non_const_T_base() : x(0,0) {} mutable fugu::vector2_t<T> x; } ; } // namespace } // namespace and then I can do fugu::vector2_t<float> y; // no initialization boost::value_initialized<fugu::vector2_t<float> > x; // now x is [0,0] but I'm not sure if it is a good solution... By the way, the lib can be downloaded at: http://sourceforge.net/projects/fugu-lib/ It has small vectors and matrices with support for serialization and iterators and some other things. Est.