c 2b 2b pointer to base class

1#include <cstdlib>
2#include <ctime>
3#include <iostream>
4#include <vector>
5
6class Parent {
7public:
8    virtual void sayHi()
9    {
10        std::cout << "Parent here!" << std::endl;
11    }
12};
13
14class Child : public Parent {
15public:
16    void sayHi()
17    {
18        std::cout << "Child here!" << std::endl;
19    }
20};
21
22class DifferentChild : public Parent {
23public:
24    void sayHi()
25    {
26        std::cout << "DifferentChild here!" << std::endl;
27    }
28};
29
30int main()
31{
32    std::vector<Parent*> parents;
33
34    // Add 10 random children
35    srand(time(NULL));
36    for (int i = 0; i < 10; ++i) {
37        int child = rand() % 2; // random number 0-1
38        if (child) // 1
39            parents.push_back(new Child);
40        else
41            parents.push_back(new DifferentChild);
42    }
43
44    // Call sayHi() for each type! (example of polymorphism)
45    for (const auto& child : parents) {
46        child->sayHi();
47    }
48
49    return 0;
50}