In this article, we will learn about c++ this pointer.In C++ programming, this is a keyword that refers to the current instance of the class.
Every object in C++ has access to its own address through an important pointer called this pointer. This pointer is an implicit parameter to all member functions. Therefore, inside a member function, this may be used to refer to the invoking object.
There can be 3 main usage of this keyword in C++.
- It can be used to pass a current object as a parameter to another method.
- It can be used to refer current class instance variable.
- It can be used to declare indexers.
Example of this pointer
Let’s see the example of this keyword in C++ that refers to the fields of current class.
#include <iostream>
using namespace std;
class Employee {
public:
int id; //data member (also instance variable)
string name; //data member(also instance variable)
float salary;
Employee(int id, string name, float salary)
{
this->id = id;
this->name = name;
this->salary = salary;
}
void display()
{
cout<<id<<" "<<name<<" "<<salary<<endl;
}
};
int main(void) {
Employee e1 =Employee(101, "Sonoo", 890000); //creating an object of Employee
Employee e2=Employee(102, "Nakul", 59000); //creating an object of Employee
e1.display();
e2.display();
return 0;
} Output:
101 Sonoo 890000 102 Nakul 59000
Previously: C++ pointers
Previously: OOps concept in c++
