Upcasting in C++
Upcasting
Upcasting allows public inheritance without the need of an explicit type cast.
Upcasting is a process of converting the derived class pointer to base class pointer so that anything that we can do on the base object can also be done on the derived class object.
Both upcasting and downcasting gives it possible to write complex programs with a simple syntax
Upcasting in C++
Steps in upcasting
- Create parent class pointer
- Create an object for child class
- Assign the address of the child object (reference) the parent class pointer
- Invoke methods using child object
Example program to demonstrate upcasting in C ++
#include <iostream>
using namespace std;
class parent //parent class
{
public:
void show()
{
cout << "Base class\n";
}
};
class child:public parent //child class
{
public:
void show()
{
cout << "Derived Class\n"; } }; int main() { parent* p; //Base class pointer child c; //Derived class object p = &c; //assign child reference to parent class pointer c.show(); //Late Binding Ocuurs p->show();
return 0;
}
Output
Derived class Base class
Upcasting allows treating a derived type as if it was its base type i.e any changes made on derived will also show an effect on the base class
If you do upcasting you can call only access to those properties that are inherited or overridden from base class, child class properties cannot be accessible.
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