Referencia a un puntero en C++ con ejemplos y aplicaciones

// CPP program to demonstrate references to pointers.
#include <iostream>
using namespace std;
  
int main()
{
    int x = 10;
  
    // ptr1 holds address of x
    int* ptr1 = &x;
  
    // Now ptr2 also holds address of x.
    // But note that pt2 is an alias of ptr1.
    // So if we change any of these two to
    // hold some other address, the other
    // pointer will also change.
    int*& ptr2 = ptr1;
  
    int y = 20;
    ptr2 = &y;
  
    // Below line prints 20, 20, 10, 20
    // Note that ptr1 also starts pointing
    // to y.
    cout << *ptr1 << " " << *ptr2 << " "
         << x << " " << y;
  
    return 0;
}

// A C++ program to demonstrate application
// of reference to a pointer.
#include <iostream>
using namespace std;
  
// A linked list node
struct Node {
    int data;
    struct Node* next;
};
  
/* Given a reference to pointer to the head of
   a list, insert a new value x at head */
void push(struct Node *&head, int x)
{
    struct Node* new_node = new Node;
    new_node->data = x;
    new_node->next = head;
    head = new_node;
}
  
// This function prints contents of linked
// list starting from head
void printList(struct Node* node)
{
    while (node != NULL) {
        cout << node->data << " ";
        node = node->next;
    }
}
  
/* Driver program to test above functions*/
int main()
{
    /* Start with the empty list */
    struct Node* head = NULL;
    push(head, 1);
    push(head, 2);
    push(head, 3);
  
    printList(head);
  
    return 0;
}