C++要点笔记(22)——多态(Polymorphism)

下面是对Polymorphism的解释:

Polymorphism means “many forms”. It is where one type of thing comes in many forms. So you can treat it according to its type, but it will behave differently according to which form of that type it happens to be.

Polymorphism含义为一个类型有多种形式:这些形式虽属于同一类型,但是具体的行为不同。

Polymorphism stems from inheritance. The whole idea is that you have a general base class and more specific derived classes. You can then write code that works with the base class… and polymorphims makes your code not only work with the base class, but all derived classes.

Polymorphism源于继承,它可以让代码对基类和衍生类都能工作。

One of the features of derived classes is that a pointer to a derived class is type-compatible with a pointer to its base class. Polymorphism takes advantage of this feature.

Polymorphism利用了衍生类的指针与基类指针兼容的特性。

A class that declares or inherits a virtual function is called a polymorphic class.

Polymorphism class是定义或继承了virtual functionclass

Pure virtual function定义:

virtual void f() = 0;

包含pure virtual function定义的类是abstract class

参考资料:
I don’t understand Polymorphism at all?
C++ polymorphism and abstract base class

 

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