c++ - preserving alias template instantiation info -


i trying write c++11 library on gcc vector extensions, clang tries compatible with. started traits vector types:

template <typename t, unsigned n> struct vector_traits;  template <> struct vector_traits<float, 3> {   static constexpr auto size = 3;    using value_type = float;       using vector_type = value_type __attribute__((vector_size(16))); };  template <> struct vector_traits<float, 4> {   static constexpr auto size = 4;    using value_type = float;       using vector_type = value_type __attribute__((vector_size(16))); };

note, how 2 trait specializations same. thought:

template <typename t, unsigned n> using vector = typename vector_traits<t, n>::vector_type;

but alias templates can't deduced. so, can't deduce whether i've instantiated vector n=3 or 4. ways exist preserve information, without introducing wrapper class/struct? say

template <typename t, unsigned n> struct vector<t, n> {    typename vector_traits<t, n>::vector_type data_; };


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