当前位置:网站首页>子类隐藏父类的同名函数
子类隐藏父类的同名函数
2022-07-03 15:20:00 【宇龍_】
在C++中,子类是不能重载父类函数的,因为重载只发生在同一个类中。
所以在不考虑虚函数重写的情况下,子类中所有的同名函数(仅仅是与父类的函数名称相同),都会导致父类的同名函数被隐藏。
见代码:
#include <stdio.h>
#include <stdlib.h>
class CFather
{
public:
void Test()
{
Print();
}
void Print()
{
printf("CFather\n");
}
};
class CChild:public CFather
{
public:
void Test()
{
Print();
}
void Print()
{
printf("CChild\n");
}
};
int main()
{
CChild child;
child.Test();
child.Print();
system("pause");
}
在父类CFather和子类CChild中均实现了Test和Print方法,在main函数中声明了一个CChild类的对象,此时调用Test和Print方法,输出结果如下:

以上的输出结果还是很好理解的,CChild类当然调用的是自己实现的方法。
那么以下的代码呢?
#include <stdio.h>
#include <stdlib.h>
class CFather
{
public:
void Test()
{
Print();
}
void Print()
{
printf("CFather\n");
}
};
class CChild:public CFather
{
public:
void Print()
{
printf("CChild\n");
}
};
int main()
{
CChild child;
child.Test();
child.Print();
system("pause");
}CChild类中仅仅实现了Print这个同名函数,此时调用CChild从父类继承过来的Test方法,输出结果会怎么样呢?

其实也很好理解,父类的Test方法内部调用的Print方法当然是父类自己的Print方法,因为是普通函数,不具有多态的特性。
根据以上代码,可以总结归纳几点:
1、对于父类而言,子类的所有函数均不可见。
2、对于子类而言,父类中所有的同名函数都被隐藏了。
3、在父类的其他函数中访问同名函数,访问的均为父类的同名函数。
4、在子类的其他函数中访问同名函数,访问的均为子类的同名函数。
内容可能有些重复,但无伤大雅。
PS,顺带提一下,在子类中需要访问父类的同名函数时,一般用__super关键字来访问而不建议用父类的名称,因为会给人一种调用静态方法的感觉,例子如下:
#include <stdio.h>
#include <stdlib.h>
class CFather
{
public:
void Test()
{
Print();
}
void Print()
{
printf("CFather\n");
}
};
class CChild:public CFather
{
public:
void Test()
{
Print();
}
void Print()
{
printf("CChild\n");
}
void FatherTest()
{
//CFather::Test(); //建议用__super::
__super::Test();
}
void FatherPrint()
{
//CFather::Print();
__super::Print();
}
};
int main()
{
CChild child;
child.Test();
child.Print();
child.FatherTest();
child.FatherPrint();
system("pause");
}

边栏推荐
猜你喜欢
![Mysql报错:[ERROR] mysqld: File ‘./mysql-bin.010228‘ not found (Errcode: 2 “No such file or directory“)](/img/cd/2e4f5884d034ff704809f476bda288.png)
Mysql报错:[ERROR] mysqld: File ‘./mysql-bin.010228‘ not found (Errcode: 2 “No such file or directory“)

运维体系的构建

Concurrency-01-create thread, sleep, yield, wait, join, interrupt, thread state, synchronized, park, reentrantlock

Visual upper system design and development (Halcon WinForm) -3 Image control

Seckill system 2 redis solves the problem of distributed session

视觉上位系统设计开发(halcon-winform)-3.图像控件
![[transformer] Introduction - the original author of Harvard NLP presented the annotated transformer in the form of line by line implementation in early 2018](/img/2b/b23aeab584f89be6678c0fe059d4b6.png)
[transformer] Introduction - the original author of Harvard NLP presented the annotated transformer in the form of line by line implementation in early 2018

基础SQL教程

Unity hierarchical bounding box AABB tree

【云原生训练营】模块七 Kubernetes 控制平面组件:调度器与控制器
随机推荐
[combinatorics] permutation and combination (set permutation, step-by-step processing example)
Analysis of development mode process based on SVN branch
Kubernetes vous emmène du début à la fin
The first character of leetcode sword offer that only appears once (12)
Dataframe returns the whole row according to the value
Digital image processing -- popular Canny edge detection
Nppexec get process return code
Puppet自动化运维排错案例
What is one hot encoding? In pytoch, there are two ways to turn label into one hot coding
Kubernetes - yaml file interpretation
如何使用 @NotNull等注解校验 并全局异常处理
Popular understanding of ovo and ovr
Mysql报错:[ERROR] mysqld: File ‘./mysql-bin.010228‘ not found (Errcode: 2 “No such file or directory“)
[transform] [practice] use pytoch's torch nn. Multiheadattention to realize self attention
Introduction to redis master-slave, sentinel and cluster mode
The state does not change after the assignment of El switch
Visual upper system design and development (Halcon WinForm) -2 Global variable design
Visual upper system design and development (Halcon WinForm) -1 Process node design
详解指针进阶2
Kubernetes advanced training camp pod Foundation