What is a factory class in C++?
A factory method is a static method of a class that returns an object of that class’ type. But unlike a constructor, the actual object it returns might be an instance of a subclass. Another advantage of a factory method is that it can return existing instances multiple times.
How do you read a factory method?
Understanding the Factory Method Design Pattern
- Product : it defines an abstract blueprint of objects the factory method creates.
- Concrete Product : sub-classes product and is the actual blueprint of objects which is created.
- Creator : it declares the factory method, which returns an object of type Product.
Which is an example of a class factory?
A class factory constructs instances of other classes. Typically, the classes they create share a common base class or interface, but derived classes are returned. For example, you could have a class factory that took a database connection string and returned a class implementing IDbConnection such as SqlConnection (class and interface from .Net)
How are factory methods used in class based programming?
Factory method pattern. In class-based programming, the factory method pattern is a creational pattern that uses factory methods to deal with the problem of creating objects without having to specify the exact class of the object that will be created. This is done by creating objects by calling a factory method—either specified in an interface
What does a class factory do in Python?
Also see the related answers here to the question Class factory in Python as well as the 2001 Dr. Dobb’s article about implementing them with C++ Templates titled Abstract Factory, Template Style. A class factory is a method which (according to some parameters for example) returns you a customised class (not instantiated!).
Which is an example of a base class?
As an example, consider the base class Shape, which is simply a container for a list of coordinates: