C++ this pointer

this-pointer-in-c-plus-plus

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
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