mp_units::fmod

template<
    auto R1,
    typename Rep1,
    auto R2,
    typename Rep2>
requires requires(Rep1 v1, Rep2 v2) {
    get_common_reference(R1, R2);
    requires requires { fmod(v1, v2); } || requires { std::fmod(v1, v2); };
  }
[[nodiscard]]
constexpr
QuantityOf<get_quantity_spec(R1)> auto
fmod(
    quantity<R1, Rep1> const& x,
    quantity<R2, Rep2> const& y) noexcept;