Lecture 5
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Object-Oriented Programming: Destructors and Constructor Overloading, Lecture notes of Object Oriented Programming
This lecture note provides a comprehensive overview of destructors in object-oriented programming. It explains the naming convention, syntax, and behavior of destructors, emphasizing their role in memory deallocation. The note also delves into constructor overloading, illustrating how multiple constructors can be defined within a class to handle different initialization scenarios. The lecture further explores the concept of scope resolution operators and how they are used to define member functions outside the class declaration. The note concludes with a discussion on object initialization using other objects of the same type and the default copy constructor.
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Destructor
- (^) Naming Convention : A destructor has the same name as the class but is preceded by a tilde (~).
- (^) Syntax : ~ClassName()
- (^) No Parameters and Return Type: Destructors cannot take parameters. They do not return any value, not even void.
- (^) Automatic called : Destructors are called automatically when an object is destroyed. They cannot be called explicitly like regular member functions.
- (^) One Destructor per Class: A class can have only one destructor. If not explicitly defined, the compiler provides a default destructor.
- (^) The most common use of destructors is to deallocate memory that was allocated for the object by the constructor.
- Lecture
- Example
- Example
Example 3
- (^) Since there are now two explicit constructors with the same name, Distance(), we say the constructor is overloaded. - (^) Which of the two constructors is executed when an object is created depends on how many arguments are used in the definition:
Example 3 Member function defined outside the class
- (^) Which of the two constructors is executed when an object is created depends on how many arguments are used in the definition:
It is only declared inside the cla
This tells the compiler that this function is a member of the class but that it will be defined outside the class declaration, someplace else in the listing.
- (^) The function name, add_dist(), is preceded by the class name, Distance, and a new
symbol—the double colon (::).
- (^) This symbol is called the scope resolution operator.
- (^) It is a way of specifying what class something is associated with.
- (^) In this situation, Distance::add_dist() means “the add_dist() member function of the
Distance class.”
Objects as an arguments
Default copy constructor
- (^) You don’t need to create a special constructor for this; one is already built into all classes. It’s called the default copy constructor
Returning objects from function