tables::mtuple::operator

1) Assignment operator

template <typename... Ks, typename... Vs>
mtuple<std::pair<Ks,Vs>...>::operator=(
  const mtuple<std::pair<Ks,Vs>...>& other
)

2) Move assignment operator

template <typename... Ks, typename... Vs>
mtuple<std::pair<Ks,Vs>...>::operator=(
  mtuple<std::pair<Ks,Vs>...>&& other
)