I am trying to specialise a std::hash struct to accept my fixed<..> type, but am getting a fairly cryptic

        std::size_t operator()(fixed<Size, ScalingFactorInverse, Signed> number) const {
                               ^

Here is the hash specialisation:

template<std::size_t Size, uint64_t ScalingFactorInverse, bool Signed>
struct std::hash<fixed<Size, ScalingFactorInverse, Signed>>{
        std::size_t operator()(fixed<Size, ScalingFactorInverse, Signed> number) const {
        static std::hash<decltype(number.data)> hasher{};
        return hasher(number.data);
    }
};

Can somebody tell me what’s going wrong here?

Thanks in advance