returning a vector in c 2b 2b

1std::vector<x>f();

1++ cCopy#include <iostream>
2#include <vector>
3#include <iterator>
4
5using std::cout; using std::endl;
6using std::vector;
7
8vector<int> multiplyByFour(vector<int> &arr)
9{
10    vector<int> mult;
11    mult.reserve(arr.size());
12
13    for (const auto &i : arr) {
14        mult.push_back(i * 4);
15    }
16    return mult;
17}
18
19int main() {
20    vector<int> arr = {1,2,3,4,5,6,7,8,9,10};
21    vector<int> arrby4;
22
23    arrby4 = multiplyByFour(arr);
24
25    cout << "arr    - | ";
26    copy(arr.begin(), arr.end(),
27         std::ostream_iterator<int>(cout," | "));
28    cout << endl;
29    cout << "arrby4 - | ";
30    copy(arrby4.begin(), arrby4.end(),
31         std::ostream_iterator<int>(cout," | "));
32    cout << endl;
33
34
35    return EXIT_SUCCESS;
36}
37