特化模板

template<typename T>
class Add
{
public: 
    T add(const T& a, const T& b)
    {
        T result = a + b;
        return result;
    }
};

template<>
class Add<std::string>    //模板特化
{
public:
    std::string add(const std::string& a, const std::string& b)
    {
        cout << "string add...
";
        std::string result = a +"__"+ b;
        return result;
    }
};

int main()
{
    Add<int> intAdd;
    int c = intAdd.add(1, 2);
    cout << c << endl;
    Add<std::string> strAdd;
    std::string cc =strAdd.add("hello", "world");
    cout << cc << endl;
    system("pause"); 
}

特化模板