lst-0007-book.cpp
// https://godbolt.org/z/MMP16Mj3W
#include <iostream>
#include <array>
#include <string>
using std::array;
template<typename T, size_t S>
auto append(const array<T, S>& data, T elem) {
array<T, S+1> result {};
for(auto i=0u; i < data.size(); ++i)
result[i] = data[i];
result[S] =elem;
return result;
}
int main() {
// before
array pics { 3, 4, 5 };
std::cout << pics[0] << '\n'; // Output: 3
// enlarge
auto more = append(pics, 77);
// after
std::cout << more[3] << '\n'; // Output: 77
}