template<class T>
struct Traits
{
    static std::string name(int);
};

template<>
std::string Traits<Color>::name(int n)
{
    if(n==(int)Color::green)return std::string("green");
    if(n==(int)Color::red)return std::string("red");   
    if(n==(int)Color::orange)return std::string("orange");
    return std::string("unknown");
};

template <>
std::string Traits<Fruit>::name(int n)
{
    if(n==(int)Fruit::apple)return std::string("apple");
    if(n==(int)Fruit::orange)return std::string("orange");   
    if(n==(int)Fruit::pear)return std::string("pear");
    return std::string("unknown");   
}