gistfile1.txt

// VFALCO temporarily needed until
//   boost::string_view supports std::hash
struct hash
{
    std::size_t
    operator()(
        string_view s) const
    {
        return (*this)(s,
            std::integral_constant<bool,
            (sizeof(std::size_t)>4)>{});
    }

    std::uint64_t
    operator()(
        string_view s,
        std::true_type) const
    {
        unsigned char const* p =
            reinterpret_cast<
                unsigned char const*>(
                    s.data());
        unsigned char const* const e =
            p + s.size();
        std::uint64_t h =
            14695981039346656037u;
        for (; p < e; ++p)
            h = (h ^ *p) *
                1099511628211u;
        return h;
    }

    std::uint32_t
    operator()(
        string_view s,
        std::false_type) const
    {
        unsigned char const* p =
            reinterpret_cast<
                unsigned char const*>(
                    s.data());
        unsigned char const* const e =
            p + s.size();
        std::uint32_t h =
            2166136261;
        for (; p < e; ++p)
            h = (h ^ *p) *
                16777619;
        return h;
    }
};