swap pointers

#include "pch.h"
#include <iostream>

using namespace std;

template <typename T> void swap(T* const src, T* const dst)
{
    T tmp = *src;
    *src = *dst;
    *dst = tmp;
}

int main()
{
    int a = 10;
    int b = 20;

    cout << "a :" << a << " b: " << b << endl;
    swap(&a, &b);
    cout << "a :" << a << " b: " << b << endl;
}