Object Oriented Programming Questions Medium
In object-oriented programming (OOP), the 'default' keyword serves the purpose of defining a default value or behavior for a class or its members.
One of the main uses of the 'default' keyword is in constructors. When a class does not explicitly define any constructors, the compiler automatically generates a default constructor. This default constructor initializes the object's member variables with their default values. However, if the class does define any constructors, the default constructor is not automatically generated unless explicitly declared using the 'default' keyword. In this case, the 'default' keyword instructs the compiler to generate the default constructor.
Additionally, the 'default' keyword can be used in other member functions, such as assignment operators and destructors. When a class does not provide its own implementation for these functions, the compiler generates a default implementation. However, if the class wants to explicitly use the compiler-generated default implementation, the 'default' keyword can be used to indicate this.
In summary, the 'default' keyword in OOP is used to specify that the compiler should generate a default value or behavior for a class or its members, such as a default constructor, assignment operator, or destructor.