The Inheritance Hierarchy of QT

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original website:http://qt-project.org/doc/qt-5/hierarchy.html

Inheritance Hierarchy


In SystemVerilog, both implementation inheritance and interface inheritance are important concepts for code reuse and design organization. ### Implementation Inheritance Implementation inheritance, also known as class inheritance, allows a subclass to inherit the properties and methods of a superclass. The `extends` keyword is used to establish the inheritance relationship. This form of inheritance is useful for creating a hierarchy of classes where the subclass can reuse the code of the superclass and also extend or override its functionality. ```systemverilog class ParentClass; int parentProperty; function void parentMethod(); $display("This is a method from the parent class."); endfunction endclass class ChildClass extends ParentClass; int childProperty; function void childMethod(); $display("This is a method from the child class."); endfunction endclass ``` In this example, `ChildClass` inherits `parentProperty` and `parentMethod` from `ParentClass`. It also has its own unique property `childProperty` and method `childMethod`. ### Interface Inheritance Interface inheritance involves a class implementing one or more interfaces. An interface defines a set of method signatures without providing their implementations. A class that implements an interface must provide the actual implementation for all the methods declared in the interface. The `implements` keyword is used to indicate that a class implements an interface. ```systemverilog interface MyInterface; function void interfaceMethod(); endinterface class ImplementingClass implements MyInterface; function void interfaceMethod(); $display("This is the implementation of the interface method."); endfunction endclass ``` Here, `ImplementingClass` implements the `MyInterface` and provides the implementation for the `interfaceMethod`. ### Key Differences - **Code Reuse**: Implementation inheritance focuses on reusing the code of the superclass, while interface inheritance focuses on adhering to a common set of method signatures defined by the interface. - **Polymorphism**: Both support polymorphism. In implementation inheritance, a superclass handle can refer to a subclass object. In interface inheritance, an interface handle can refer to any object of a class that implements the interface. - **Coupling**: Implementation inheritance creates a tighter coupling between the superclass and the subclass. Changes in the superclass may affect the subclass. Interface inheritance has a looser coupling as the interface only defines the method signatures and the class provides the implementation. ###
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