c++ - 使用模板参数包扩展枚举

Question

这是创建枚举扩展行为的说明。我已经这样实现了：

继承num.h：

    template <typename BaseEnumT, typename EnumT>
    class InheritEnum{
    public:
        InheritEnum() {}
        InheritEnum(EnumT e): enumt_(e){}
        InheritEnum(BaseEnumT e): baseEnum_(e){}
        explicit InheritEnum(int val): enumt_(static_cast<EnumT>(val)){}
        operator EnumT() const { return enumt_; }
    private:
        EnumT enumt_;
        BaseEnumT baseEnum_;
    };

然后在main.cpp：

    enum class Fruit { apple, orange };
    enum class Drink { water, milk };
    typedef InheritEnum<Fruit, Drink> Eatable;
    void GetIt(Eatable eatable) {}
    int main(){
         GetIt(Fruit::apple);
    }

我可以扩展行为以继承另一种这样的类型

继承编号.h

    template <typename BaseEnumT, typename EnumT, typename EnumV>
    class InheritEnum{
    public:
        InheritEnum() {}
        InheritEnum(EnumT e): enumt_(e){}
        InheritEnum(EnumV e): enumv_(e){}
        InheritEnum(BaseEnumT e): baseEnum_(e){}
        explicit InheritEnum(int val): enumt_(static_cast<EnumT>(val)), enumv_(static_cast<EnumV>(val)){}
        operator EnumT() const { return enumt_; }
        operator EnumV() const { return enumv_; }
    private:
        EnumV enumv_;
        EnumT enumt_;
        BaseEnumT baseEnum_;
    };

然后在main.cpp：

    enum class Fruit { apple, orange };
    enum class Drink { water, milk };
    enum class Food { pasta, fish };
    typedef InheritEnum<Fruit, Drink, Food> Eatable;
    void GetIt(Eatable eatable) {}
    int main(){
         GetIt(Food::fish);
    }

问题是如何在这里使用参数包，而不是手动添加新类型：

    template <typename BaseEnumT, typename... EnumG>
    class InheritEnum{
        // how to modify the original code
    }