How Does Buffer Swapping Work in C++?

1#include <iostream>
2#include <vector>
3
4typedef std::vector<int> Buffer;
5
6void swapBuffers(Buffer*& front, Buffer*& back) {
7  Buffer* temp = front;
8  front = back;
9  back = temp;
10}
11
12int main() {
13  Buffer A = {0};  // Front buffer
14  Buffer B = {1};  // Back buffer
15  Buffer* frontBuffer = &A;
16  Buffer* backBuffer = &B;
17
18  std::cout << "Initial front buffer value: "
19    << frontBuffer->at(0)
20            << '\n';  
21  swapBuffers(frontBuffer, backBuffer);
22  std::cout << "New front buffer value: "
23    << frontBuffer->at(0) << '\n';  
24}