[boost] BOOST_NO_CXX11_CONSTEXPR and msvc-14.0

I see that BOOST_NO_CXX11_CONSTEXPR is no longer being defined for msvc-14.0. Even the RTM version has spotty support for constexpr though; the techniques in my metaprogramming article, for example, don't work. One simple example that fails is #include template< int I > struct X { }; template constexpr int f( T... t ) { return 1; } template< class... T > struct Y: X< f(std::is_same::value...) > { }; Y y; int main() { } Another is #include template< class... T > struct X { static constexpr bool v[] = { std::is_same::value... }; }; int main() { }