mp_units::get_common_quantity_spec

[[nodiscard]]
consteval
QuantitySpec auto
get_common_quantity_spec(auto q);

template<
    QuantitySpec Q1,
    QuantitySpec Q2>
requires (detail::have_common_quantity_spec(Q1{}, Q2{}))
[[nodiscard]]
consteval
QuantitySpec auto
get_common_quantity_spec(
    Q1,
    Q2);

[[nodiscard]]
consteval
QuantitySpec auto
get_common_quantity_spec(
    auto q1,
    auto q2,
    auto q3,
    auto... rest)
requires requires { mp_units::get_common_quantity_spec(mp_units::get_common_quantity_spec(q1, q2), q3, rest...); };