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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++