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c++boost-hana

Creating a hana::set from template parameter pack

I'm struggling to figure out how to make a hana::set from a template parameter pack. I have a method that I have used for tuples (tuple_t) but it seems to create a set I have to use make_set. Here is where I'm getting stuck:

template<typename ...Ts>
class Foo
{
public:
    static constexpr auto asTuple = hana::tuple_t<Ts...>;
    static constexpr auto asSet = hana::make_set(/*what goes here?*/);
};

Thanks

Solution

  • You have to expand the types with the hana::type_c helper:

    static constexpr auto asSet = hana::make_set(hana::type_c<Ts>...);

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