template <typename l, typename t, typename m, typename I, typename T, typename N, typename J, typename A, typename SA> constexprQuantity<l, t, m, I, T, N, J, A, SA> hermes::units::operator-(constQuantity<l, t, m, I, T, N, J, A, SA> &lhs, constQuantity<l, t, m, I, T, N, J, A, SA> &rhs)¶