this pointer in C++

this is a keyword that refers to the current instance of the class.

this pointer holds the address of current object.

Uses:

1. It can be used to pass current object as a parameter to another method.
2. It can be used to refer current class instance variable.

Example:

#include <iostream> 

using namespace std; 

class Student { 

   public: 

       int age; //data member (also instance variable)     

       string name; //data member(also instance variable) 

       float marks; 

      Student(int age, string name, float marks)   

        {   

             this->age = age;   

            this->name = name;   

            this->marks = marks;  

        }   

       void display()   

        {   

            cout<<"age is:"<<age<<"\n"<<"name is:"<<name<<" \n "<<"marks is:"<<marks<<endl;   

        }   

      }; 

int main(void) { 

 Student  s1 (14, "Suryosnata", 89.45); //creating an object of Student

  s1.display();   

  return  0; 

} 

Output:

age is:14                                                                                                                     

name is:Suryosnata                                                                                                            

marks is:89.45

Note:

Friend functions do not have a this pointer ,because friends are not members of a class.only member function have a this pointer.