虚拟继承

本文介绍了虚拟继承的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 限时删除！！ virtual继承的意义是什么？ 我看到下面的代码，不明白关键字 virtual 在以下上下文中： class A {}; B类：public virtual A; 解决方案虚拟继承用于解决DDD问题查看下面的示例，其中有两个类继承自同一个基类： class Base { public： virtual void Ambig }; C：public Base { public： // ... }; class D：public Base { public： // ... } 现在，您要创建一个新类继承了C和D类（它们都继承了Base :: Ambig（）函数）： class Wrong：public C，public D { public： ... }; 在上面定义Wrong类时，实际上创建了DDD（Diamond Derivation问题）因为你不能调用： 错误; wrong.Ambig（）; 这是一个模糊的函数，因为它定义了两次： Wrong :: C :: Base :: Ambig（） $ b b 和： Wrong :: D :: Base :: Ambig（） 为了防止这种问题，你应该使用虚拟继承，这将知道引用正确的 Ambion（） function。 所以 - define： class C：public virtual Base class D：public virtual Base class Right：public C，public D What is the meaning of "virtual" inheritance?I saw the following code, and didn't understand the meaning of the keyword virtual in the following context: class A {};class B : public virtual A; 解决方案 Virtual inheritance is used to solve the DDD problem (Dreadful Diamond on Derivation).Look at the following example, where you have two classes that inherit from the same base class:class Base{public: virtual void Ambig();};class C : public Base{public://...};class D : public Base{public: //...};Now, you want to create a new class that inherits both from C and D classes (which both have inherited the Base::Ambig() function):class Wrong : public C, public D{public:...};While you define the "Wrong" class above, you actually created the DDD (Diamond Derivation problem), because you can't call:Wrong wrong;wrong.Ambig();This is an ambiguous function because it's defined twice:Wrong::C::Base::Ambig()And:Wrong::D::Base::Ambig()In order to prevent this kind of problem, you should use the virtual inheritance, which will know to refer to the right Ambig() function.So - define:class C : public virtual Baseclass D : public virtual Baseclass Right : public C, public D 这篇关于虚拟继承的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！ 1403页，肝出来的..