#include <array>
#include <iostream>
 
using namespace std;
 
template<size_t... Is> struct seq {};
template<size_t N, size_t... Is> struct gen_seq : gen_seq<N - 1, N - 1, Is...> {};
template <size_t... Is> struct gen_seq<0, Is...> : seq<Is...>{};
 
template<typename Func, size_t... Is>
constexpr array<float, sizeof...(Is)> make_coeffs(Func f, seq<Is...>) {
    return array<float, sizeof...(Is)>{ f(Is)... };
}
 
constexpr float square(float x) { return x * x; }
 
int main() {
    constexpr auto coeffs = make_coeffs(square, gen_seq<10>{});
	static_assert(coeffs[3] == 9, "");
    for (float x : coeffs) {
        cout << x << " ";
    }
    cout << endl;
}
 

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