template<typename Enum>
struct EnumTraits;

template<typename Enum>
using EnumTraitsType = typename EnumTraits<Enum>::Type;

template<>
struct EnumTraits<Enum1::EnumerationItem>
{
    using Type = Enum1;
};

template<>
struct EnumTraits<Enum2::EnumerationItem>
{
    using Type = Enum2;
};

template <typename T>
class TemplateExample
{
public:
    TemplateExample(T t)
        : t { t } {}

    virtual ~TemplateExample() {}

    std::string toString()
    {
        return EnumTraitsType<T>::toString(this->t);
    }

private:
    T t;
};