Class AUpdate

tests/cpp_unit_tests/auxiliary/test_dataset.cpp:44–50

    double a1{nan};
};
struct AUpdate {
    static constexpr auto id_name = "id";
    static constexpr auto a0_name = "a0";

    ID id{na_IntID};
    double a0{nan};
};
template <symmetry_tag symmetry> struct AOutput {
    using sym = symmetry;