我想传递类名oltosmol作为参数，这样它将创建一个带有默认构造函数的对象。它通常可以工作，但在这里不行。而且问题只存在于oltosmol。

error: request for member 'creator' in 'smolifier', which is of non-class type 'StatP::CharProcessor\<StatP::oltosmol\>(StatP::oltosmol)'

namespace StatP
{
    class oltosmol
    {
    public:
        oltosmol() {}
        char transform(char c)
        {
            if (c >= 'A' && c <= 'Z')
                return c + 'a' - 'A';
            return c;
        }
    };
    class Cutifier
    {
        unsigned period;
        unsigned counter;
    public:
        Cutifier(unsigned p): period(p), counter(0) {}
        char transform(char c)
        {
            if (counter == period)
            {
                counter = 0;

                if (c == ' ')
                    return '\3';
                else if (c >= 'a' && c <= 'z')
                    return c - 'a' + 'A';
                else if (c >= 'A' && c <= 'Z')
                    return c - 'A' + 'a';
                return c;
            }
            else
            {
                counter++;
                return c;
            }
        }
    };

    template<class Transformer>
    class CharProcessor
    {
        Transformer transformer;
    public:
        CharProcessor(const Transformer &t): transformer(t) {}

        String<char> creator(String<char> &s)
        {
            char *n_data = new char[s.get_length() + 1];
            for (unsigned i = 0; i < s.get_length(); i++)
                n_data[i] = transformer.transform(s[i]);
            n_data[s.get_length()] = '\0';

            return String<char>(n_data);
        }
        void changer(String<char> &s)
        {
            for (unsigned i = 0; i < s.get_length(); i++)
                s[i] = transformer.transform(s[i]);
        }
    };
}

int main()
{
    const char coca_cola[] = "Coca-cola";

    String<char> water_name = coca_cola;
    copy = water_name;

//    ...

    StatP::CharProcessor<StatP::oltosmol> smolifier(StatP::oltosmol);
    std::cout << smolifier.creator(water_name) << "\n\n";

    return 0;
}

我试过添加()并删除命名空间，但仍然不起作用。如果我先将对象赋给变量，程序会运行，但我不想也不应该这样做。