Produce std::tuple of same type in compile time given its length by a template argument

Question

In c++, how can I implement a function with an int template argument indicating the tuple length and produce a std::tuple with that length?

E.g.

func<         


        

Answer 1

The plain old recursion is your friend:

template
auto array_tuple() {
    return std::tuple_cat(std::tuple{}, array_tuple());
}

template<>
auto array_tuple<0>() {
    return std::tuple<>{};
}