boost::lambda::bind operator = std::vector sucess, bnu::vector and std::valarray fail

I’m just starting to use boost::lambda an boost::lambda::bind, and I do not understand why this do not work whith bnuy::vector && std::valarray : class CToto{ public: CToto(double _i): a(_i) {} CToto(): a(0.0) {} double get() const {return a;} private: double a; }; std::vector<std::CToto *> aTotoPtrVect; aTotoPtrVect.push_back(new std::CToto(1.1)); aTotoPtrVect.push_back(new std::CToto(2.2)); aTotoPtrVect.push_back(new std::CToto(3.3)); aTotoPtrVect.push_back(new std::CToto(4.4)); //case 1 std::vector <double> dv(std::distance((aTotoVect.begin(), aTotoVect.end()); std::for_each(aTotoPtrVect.begin(), aTotoPtrVect.end(), bll::var(dv)[bll::var(uiIdx)++] = bll::bind(&CToto::get, bll::_1)); // work fine //case 2 double d(4) std::for_each(aTotoPtrVect.begin(), aTotoPtrVect.end(), bll::var(d)[bll::var(uiIdx)++] = bll::bind(&CToto::get, bll::_1)); // work fine //case 3 std::valaray <double> dvv(std::distance((aTotoVect.begin(), aTotoVect.end()); std::for_each(aTotoPtrVect.begin(), aTotoPtrVect.end(), bll::var(dvv)[bll::var(uiIdx)++] = bll::bind(&CToto::get, bll::_1)); // do not compile //case 4 bnu::vector<double> bvv(std::distance((aTotoVect.begin(), aTotoVect.end()); std::for_each(aTotoPtrVect.begin(), aTotoPtrVect.end(), bll::var(bvv)[bll::var(uiIdx)++] = bll::bind(&CToto::get, bll::_1)); // do not compile Is someone could explain me why it work in 1 and 2 ?