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#include <array>
#include <iostream>
using namespace std;
// Test that array has linkage
template<auto& arr>
void test() {
for(auto& val : arr)
cout << val << ", ";
cout << endl;
}
// Get array with linkage
template<size_t... vals>
constexpr auto valsToArr = array<size_t, sizeof...(vals)>{ vals... };
int main()
{
// Just make the lambda return a reference to a constexpr array to begin with
// Avoid the need to convert it to a param pack, then an array template variable
// in order to obtain an array with linkage, that can be passed to test<>()
auto lam = []() -> auto& { return valsToArr<1, 2, 3>; };
constexpr auto& res = lam();
test<res>();
return 0;
}
