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C++ OOP

What is a Destructor of the ClassWhat is a Destructor of the Class

Constructor

Destructors are special member functions that are invoked when an object's lifetime ends. Their primary purpose is to release resources that the object may have acquired during its lifetime.

Syntax of Destructor

Even though they serve opposite purposes creating a destructor is very similar to creating a constructor. They share almost the same declaration principles. The general approach to creating one is:

code example
  • Name: It has the same name as the class, but is preceded by a tilde (~).
  • No Return Type: It does not have a return type, not even void.
  • No Parameters: It cannot take any parameters.
  • Automatic Invocation: It is called automatically by the compiler when the object goes out of scope or is explicitly deleted.

Automatic Invocation of Destructors

The automatic invocation of destructors refers to the automatic calling of the destructor. This ensures that resources held by the object are properly released, thus helping to prevent memory leaks and resource leaks.

cpp

scope.cpp

cpp

delete.cpp

cpp

termination.cpp

  • When an object goes out of scope.
  • When the delete operator is used to delete dynamically allocated objects.
  • When the program terminates.

The Need of Destructors

The primary purpose of a destructor is to release resources acquired by the object during its lifetime. This includes closing file handles, deallocating memory (using new) or simmilar tasks.

cpp

ResourceHolder.cpp

cpp

FileHandler.cpp

1. What is the primary purpose of a destructor?
2. What is the syntax for declaring a destructor?
3. Which of the following is NOT a situation where a destructor is automatically invoked?

What is the primary purpose of a destructor?

Select the correct answer

What is the syntax for declaring a destructor?

Select the correct answer

Which of the following is NOT a situation where a destructor is automatically invoked?

Select the correct answer

Everything was clear?

Section 2. Chapter 7
course content

Course Content

C++ OOP

1. Fundamentals of OOP

Introduction to Object-Oriented ProgrammingWhy use Object-Oriented Programming?Class Creation SyntaxAttributes of the ClassMethods of the ClassStatic Members of The ClassThe This KeywordClasses and Objects Overview

2. Constructors and Destructors

What is a Constructor of the ClassConstructor and AttributesConstructor Initialization ListInitialization List PracticeConstructor DelegationConstructor Delegation PracticeWhat is a Destructor of the ClassCopy ConstructorsConstructors and Destructors Practice

3. Encapsulation Overview

Introduction to EncapsulationAccess Modifiers KeywordsAccess Modifiers PracticeAccessor and Mutator MethodsAccess and Mutator PracticeSegmentation and AggregationThe Friend Keyword

4. Inheritance Overview

Introduction to InheritanceAccess Modifiers in InheritanceMulptiple InheritanceConstructor and Destructor in InheritanceDiamond InheritanceThe Final Keyword

5. Polymorphism Overview

Introduction to PolymorphismVirtual and Override KeywordsPure Virtual MethodOperator OverloadingSummary and Overview

C++ OOP

What is a Destructor of the ClassWhat is a Destructor of the Class

Constructor

Destructors are special member functions that are invoked when an object's lifetime ends. Their primary purpose is to release resources that the object may have acquired during its lifetime.

Syntax of Destructor

Even though they serve opposite purposes creating a destructor is very similar to creating a constructor. They share almost the same declaration principles. The general approach to creating one is:

code example
  • Name: It has the same name as the class, but is preceded by a tilde (~).
  • No Return Type: It does not have a return type, not even void.
  • No Parameters: It cannot take any parameters.
  • Automatic Invocation: It is called automatically by the compiler when the object goes out of scope or is explicitly deleted.

Automatic Invocation of Destructors

The automatic invocation of destructors refers to the automatic calling of the destructor. This ensures that resources held by the object are properly released, thus helping to prevent memory leaks and resource leaks.

cpp

scope.cpp

cpp

delete.cpp

cpp

termination.cpp

  • When an object goes out of scope.
  • When the delete operator is used to delete dynamically allocated objects.
  • When the program terminates.

The Need of Destructors

The primary purpose of a destructor is to release resources acquired by the object during its lifetime. This includes closing file handles, deallocating memory (using new) or simmilar tasks.

cpp

ResourceHolder.cpp

cpp

FileHandler.cpp

1. What is the primary purpose of a destructor?
2. What is the syntax for declaring a destructor?
3. Which of the following is NOT a situation where a destructor is automatically invoked?

What is the primary purpose of a destructor?

Select the correct answer

What is the syntax for declaring a destructor?

Select the correct answer

Which of the following is NOT a situation where a destructor is automatically invoked?

Select the correct answer

Everything was clear?

Section 2. Chapter 7
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