Function to_string

tests/fluxpattern.cc:11–25

{
    template <class T>
    static std::string to_string(const std::vector<T>& vector)
    {
        std::stringstream s;
        s << "vector{";
        bool first = true;
        for (const T& t : vector)
        {
            if (!first)
                s << ", ";
            first = false;
            s << t;
        }
        s << "}";
        return s.str();
    }
}

#undef assert