// https://godbolt.org/z/dKPbjj1f8
#include <iostream>
#include <memory> // uninitialized_copy
#include <alloca.h> // alloca (Linux)
#include <list>
int main () {
const std::list input{1,9,2,6,6,6,8};
const auto SZ = input.size();
// uninitialized memory area:
int* target = (int*)alloca(sizeof(int) * SZ); // space for 7 ints
std::uninitialized_copy(input.begin(), input.end(), target);
// test output
for(int idx=0; idx<SZ; ++idx) {
std::cout << target[idx] << ' ';
}
std::cout << '\n'; // output: 1 9 2 6 6 6 8
}