Abstract classes cannot be used to instantiate objects and serves only as an interface Attempting to instantiate an object of an abstract class causes a
In C++, pure virtual function are used to specify the pure interfaces of abstract classes An abstract class in C++ must have at least one pure virtual function
Programming for MSc Part II Part 2: OOP in C++ — Polymorphism and Abstract Classes In the previous example, the IntStack class is an interface Abstract
Abstract classes and interfaces class Shape { public: Shape(); virtual area() = 0; }; A pure virtual function defines the interface
A class that provides the interface to a variety of other classes is often called a polymorphic type (§20 3 2) As is common for abstract classes, Container
An abstract class lets us define and enforce a common interface, or The C and C++ languages support the built in type conversions
The class diagram 2 1 shows two derived classes that implement the interface / abstract base class DynamicInterface Figure 2 1: Class diagram: Dynamic
In these cases, interfaces based on abstract classes introduce much needless inefficiency First, they add a vtable to the overhead of each instance of concrete
for interfacing with C++ classes with compatible inheritance trees Keywords: Ada 2005, Abstract Interface Types, Tagged Types, Discriminants, GNAT
Abstract classes and interfaces are somewhat similar in functionality but have different uses in interfaces_implementing_interfaces cpp interface class