Initializing an std::array of non-default-constructible elements?

Question

Suppose type foo_t with a named constructor idiom, make_foo(). Now, I want to have exactly 123 foo\'s - no more, no less. So, I\'m thinking about a

Answer 1

The usual.

template<size_t...Is>
std::array<foo_t, sizeof...(Is)> make_foos(std::index_sequence<Is...>) {
    return { ((void)Is, make_foo())... };
}

template<size_t N>
std::array<foo_t, N> make_foos() {
    return make_foos(std::make_index_sequence<N>());
}