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#include <iostream>
#include <iterator>
#include <algorithm>
#include <array>
#include <memory>
using namespace std;
template<size_t N1, size_t N2, class T1, class T2,
class T = typename common_type<T1, T2>::type>
T (*concatCArray(const T1(&arr1)[N1], const T2(&arr2)[N2]))[N1+N2]{
const auto result = (T(*)[N1+N2]) new T[N1+N2];
copy(arr2, end(arr2), copy(arr1, end(arr1), *result));
return result;
}
template<std::size_t N, class T>
void viewCArrayPtr(T (*arr)[N]){
copy(*arr, end(*arr), ostream_iterator<T>(cout, " "));
}
template<size_t N1, size_t N2, class T1, class T2,
class T = typename remove_const<typename common_type<T1, T2>::type>::type>
array<T, N1+N2> concatArray(const array<T1, N1> &arr1, const array<T2, N2> &arr2){
array<T, N1+N2> result;
copy(begin(arr2), end(arr2), copy(begin(arr1), end(arr1), result.begin()));
return result;
}
template<std::size_t N, class T>
void viewArray(const array<T, N> arr){
copy(begin(arr), end(arr), ostream_iterator<T>(cout, " "));
}
int main() {
int arr1[]{0,1,2,3}, arr2[]{4,5,6};
auto ca = concatCArray(arr1, arr2);
unique_ptr<int[]> safe(*ca);
viewCArrayPtr(ca);
cout<<endl;
array<float, 2> a {1,2.5};
array<int, 3> b{3, 4, 5};
viewArray(concatArray(a, b));
return 0;
}
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