The This Keyword

The this keyword in object-oriented programming refers to the current object instance. It provides member functions with a pointer to the object that invoked them, allowing access to that object's variables and functions.

Example


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#include <iostream>

class Example {
public:
    Example* get_address() { return this; }
};

int main()
{
    Example obj;
    std::cout << &obj << std::endl;
    std::cout << obj.get_address() << std::endl;
}

When you use the dot operator (.) to access member variables or member functions within a class, the this pointer implicitly points to the object for which the member function is called. This is often valuable in various scenarios and commonly employed to avoid ambiguity in variable names.

Example


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#include <iostream>

class Example {
public:
    void multiply(int number) { number *= number; }
    int number;
};

int main()
{
    Example obj;
    obj.number = 2;
    obj.multiply(5);
    std::cout << obj.number;
}

Here, we can utilize the this keyword since it points to the current object as a pointer. To access its attributes, we must use the -> operator.

main


              123456789101112131415
            
#include <iostream>

class Example {
public:
    void multiply(int number) { this->number *= number; }
    int number;
};

int main()
{
    Example obj;
    obj.number = 2;
    obj.multiply(5);
    std::cout << obj.number;
}

Using the this keyword is a widespread practice across various scenarios. It's often employed, particularly in large classes, to signify that a variable is a member of the classes and not an external parameter or argument.

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Cursusinhoud

C++ OOP

1. Fundamentals of OOP in C++

2. Constructors and Destructors

3. Encapsulation Overview

Introduction to Encapsulation Access Modifiers Keywords Access Modifiers Practice Accessor and Mutator Methods Segmentation and Aggregation The Friend Keyword

4. Inheritance Overview

Introduction to Inheritance Access Modifiers in Inheritance Mulptiple Inheritance Constructor and Destructor in Inheritance Diamond Inheritance The Final Keyword

5. Polymorphism Overview

Introduction to Polymorphism Virtual and Override Keywords Pure Virtual Method Operator Overloading Summary and Overview

The This Keyword

Example


              12345678910111213
            
#include <iostream>

class Example {
public:
    Example* get_address() { return this; }
};

int main()
{
    Example obj;
    std::cout << &obj << std::endl;
    std::cout << obj.get_address() << std::endl;
}

Example


              123456789101112131415
            
#include <iostream>

class Example {
public:
    void multiply(int number) { number *= number; }
    int number;
};

int main()
{
    Example obj;
    obj.number = 2;
    obj.multiply(5);
    std::cout << obj.number;
}

Here, we can utilize the this keyword since it points to the current object as a pointer. To access its attributes, we must use the -> operator.

main


              123456789101112131415
            
#include <iostream>

class Example {
public:
    void multiply(int number) { this->number *= number; }
    int number;
};

int main()
{
    Example obj;
    obj.number = 2;
    obj.multiply(5);
    std::cout << obj.number;
}

Was alles duidelijk?

Bedankt voor je feedback!

Sectie 1. Hoofdstuk 7