How to emulate C array initialization “int arr[] = { e1, e2, e3, … }” behaviour with std::array?

Question

(Note: This question is about not having to specify the number of elements and still allow nested types to be directly initialized.)
This question discu

Answer 1

(Solution by @dyp)

Note: requires C++14 (std::index_sequence). Although one could implement std::index_sequence in C++11.

#include 

// ---

#include 
#include 

template 
using c_array = T[];

template
constexpr auto make_array(T (&&src)[N], std::index_sequence) {
    return std::array{{ std::move(src[Indices])... }};
}

template
constexpr auto make_array(T (&&src)[N]) {
    return make_array(std::move(src), std::make_index_sequence{});
}

// ---

struct Point { int x, y; };

std::ostream& operator<< (std::ostream& os, const Point& p) {
    return os << "(" << p.x << "," << p.y << ")";
}

int main() {
    auto xs = make_array(c_array{{1,2}, {3,4}, {5,6}, {7,8}});

    for (auto&& x : xs) {
        std::cout << x << std::endl;
    }

    return 0;
}