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继承关系作用下的虚函数手工调用
阅读量:491 次
发布时间:2019-03-07

本文共 227 字,大约阅读时间需要 1 分钟。

在C++中,虚函数表的指针存储的是子类虚函数的地址。如果仅创建父类实例,这些指针所指的目标自然是父类中的虚函数。

观察列中子类对象和父类对象的内存布局,我们可以看到子类会在父类的基础上额外添加保护层结构。

对于父类的对象,它们仅包含父类头部结构和虚函数表指针,而子类对象则在这些基础上增加了具体实现的函数体和额外的属性成员。这种设计使子类能够按需覆盖父类的行为。

这种机制赋予了代码高度的可扩展性。通过继承和物态的多态性,代码可以灵活应对不同情况的需求。

转载地址:http://lokcz.baihongyu.com/

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