Function isNumberLike

externals/simplecpp/simplecpp.h:177–180

        bool startsWithOneOf(const char c[]) const;
        bool endsWithOneOf(const char c[]) const;
        static bool isNumberLike(const std::string& s) {
            return std::isdigit(static_cast<unsigned char>(s[0])) ||
                   (s.size() > 1U && (s[0] == '-' || s[0] == '+') && std::isdigit(static_cast<unsigned char>(s[1])));
        }

        TokenString macro;
        char op;