Explore classes and object-oriented programming concepts like information-hiding, inheritance, and polymorphism.

Become a C++ Programmer

In this module, we’ll dive into understanding the time-honored technique for implementing complex applications using user-defined classes. Moreover, we’ll discuss classes and objects, then build up to the high-level topics including inheritance and polymorphism.

Throughout the module, we’ll work with OOP for C++, with illustrations, exercises, quizzes, and hands-on challenges. By end of this module, we’ll have an understanding of classes and objects' behavior and be able to easily create simple, efficient, reusable, and secure code.

Object-oriented Programming in C++

`Composition` is accessing other classes objects in your class and *owner* class owns the object and is responsible for its lifetime. Composition relationships are **Part-of** relationships where the part must constitute part of the whole object. We can achieve composition by adding smaller parts of other classes to make a complex unit.

So, what makes composition unique? 

> In composition, the lifetime of the owned object depends on the lifetime of the owner. 

### Example

A `car` is composed of an *engine*, *tyres*, and *doors*. In this case, a `Car` owned these objects so a `Car` is an *Owner* class and `tyres`,`doors` and `engine` classes are *Owned* classes. 

`Composition` is accessing other classes objects in your class and *owner* class owns the object and is responsible for its lifetime. Composition relationships are **Part-of** relationships where the part must constitute part of the whole object. We can achieve composition by adding smaller parts of other classes to make a complex unit.

So, what makes composition unique? 

> In composition, the lifetime of the owned object depends on the lifetime of the owner. 

# Example

A `car` is composed of an *engine*, *tyres*, and *doors*. In this case, a `Car` owned these objects so a `Car` is an *Owner* class and `tyres`,`doors` and `engine` classes are *Owned* classes. 

In this lesson, we'll learn how can we achieve composition in C++.

Introduction

Classes

Data Hiding

Inheritance

Polymorphism

Composition, Aggregation and Association

Conclusion

Composition