Dynamic function creation example in C++

dynamic-adder.cpp

#include <iostream>
#include <functional>

using namespace std;

// Return a custom, parametrized adder function (lambda)
auto make_adder(int n) {
    return [n](int x) {
        return x + n;
    };
}

// Apply user-supplied function to each item in an array
// and return a fresh array with the results
int *map(int *arr, int n, function<int(int)> f)
{
    int *new_arr = new int[n];
    for (int i = 0; i < n; i++)
    {
        new_arr[i] = f(arr[i]);
    }
    return new_arr;
}

int main()
{
    int addend, n = 10;
    int numbers[10] = {1,2,3,4,5,6,7,8,9,10};
    cout << "Enter addend: " << endl;
    cin >> addend;
    int* mapped = map(numbers, 10, make_adder(addend));
    for (int i = 0; i < 10; i++) {
        cout << mapped[i] << endl;
    }

    return 0;
}