[SOLVED] Accessing the Enum Class used to make a Templated Struct C++

Accessing the Enum Class used to make a Templated Struct C++

template <typename FruitEnum>
struct FruitManager
{
    FruitEnum group
};

enum class FirstFruitEnum
{
    apple_fruit,
    banana_fruit,
};

enum class SecondFruitEnum
{
    banana_fruit,
    grape_fruit,
};

int main()
{
    FruitManager<FirstFruitEnum> fruit_manager;
}

I am trying to set up something that would work like

int index = static_cast<int>(fruit_manager.group::banana_fruit);

(equivalent in output to this)

int index = static_cast<int>(FirstFruitEnum::banana_fruit);

For context, the struct is able to be created with either enum class. How is this best done?

Solution

decltype can be used to get the type of the group member and once you have the type you can then access the enumeration.

decltype(fruit_manager.group)

gives you the type of group and then

decltype(fruit_manager.group)::banana_fruit

is how you access the enum member of the enum type that group has.