Class Abstract Templates

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Commonly Asked Questions about Class Abstract Templates

What is the difference between template and class in C++?

A template is not a class or a function. A template is a pattern that the compiler uses to generate a family of classes or functions. In order for the compiler to generate the code, it must see both the template definition (not just declaration) and the specific types/whatever used to fill in the template.

Can an abstract class have a template?

The Abstract Class declares methods that act as steps of an algorithm, as well as the actual template method which calls these methods in a specific order. The steps may either be declared abstract or have some default implementation. Concrete Classes can override all of the steps, but not the template method itself.

What is the difference between template and abstract class?

I know that template classes are instantiated the same way as the functions. A copy is created with the template parameters replaced with actual data types. Abstract classes have pure virtual functions and cannot be instantiated. Derived classes must define the virtual functions.

What is the difference between template and abstract class in CPP?

The main difference is that abstract classes (run-time polymorphism) are a run-time mechanism, while templates are a compile-time mechanism. This means that by using abstract classes you can possibly change the behaviour at run-time (e.g, by loading a configuration file at run-time, or by means of plugins).

What is the template method in abstract class?

Template method - a method that is implemented in the abstract class as an outline with steps that can be defined or redefined by concrete classes. Primitive operation - a step operation that is declared abstract in the abstract class. Concrete classes must provide an implementation.

Can a class have a template function?

Class member templates Template declarations (class, function, and variables(since C++14)) can appear inside a member specification of any class, struct, or union that are not local classes. Partial specializations of member template may appear both at class scope and at enclosing namespace scope.

How do you design an abstract class?

Unlike an ordinary class, abstract classes cant be instantiated. This means that you can not create new instances of an abstract class, as you would an ordinary class. While you cant instantiate an abstract class, it can still share properties or be related to the subclass.

What is an example of an abstract class?

An abstract class can have constructors like the regular class. And, we can access the constructor of an abstract class from the subclass using the super keyword. For example, abstract class Animal { Animal() { . } }

What are templates in coding?

Templates are the basis for generic programming in C++. As a strongly-typed language, C++ requires all variables to have a specific type, either explicitly declared by the programmer or deduced by the compiler. However, many data structures and algorithms look the same no matter what type they are operating on.

How to write an abstract class?

You create an abstract class by declaring at least one pure virtual member function. Thats a virtual function declared by using the pure specifier ( = 0 ) syntax. Classes derived from the abstract class must implement the pure virtual function or they, too, are abstract classes.