template<class T>
class TClass
{
public:

    template<class U = T,
            typename std::enable_if<std::is_same<U, int>::value, void*>::type = nullptr>
    void act()
    {
        std::cout << "Act TClass int\n";
    }

    template<class U = T,
            typename std::enable_if<!std::is_same<U, int>::value, void*>::type = nullptr>
    int act()
    {
        std::cout << "Act TClass non int\n";
        return 1;
    }

};

int main()
{
    TClass<int> t;
    t.act();

    TClass<double> t1;
    std::cout << t1.act();

    return 0;
}