Method of

extern/pybind/include/pybind11/numpy.h:879–881

    /// Return dtype associated with a C++ type.
    template <typename T>
    static dtype of() {
        return detail::npy_format_descriptor<typename std::remove_cv<T>::type>::dtype();
    }

    /// Return the type number associated with a C++ type.
    /// This is the constexpr equivalent of `dtype::of<T>().num()`.