在这段代码中，const成员函数的用途是什么?我们如何使用此功能? [英] In this code what is the use of const member function? how can we use this function ?

问题描述

在此代码中，const成员函数的用途是什么?我们如何使用它，并且可以声明任何数据成员并对其进行初始化?

In this code what is the use of const member function? how can we use it and is it possible to declare any data member and initialize it?

#include<iostream.h>
#include<conio.h>

class X
{
      private:
              int a;
      public:
             void fun()
             {
                  a=10;
                  cout<<a;
             }
             
             void fun1() const
             {
                  //a=10;
                  
             }
};

int main()
{
    X o;
    o.fun();
    o.fun1();
    getch();
    return 0;
}

[edit]已添加代码块-OriginalGriff [/edit]

[edit]Code block added - OriginalGriff[/edit]

推荐答案

直接从 ^ ]:

Direct from MSDN[^]:

Declaring a member function with the const keyword specifies that the function is a "read-only" function that does not modify the object for which it is called. A constant member function cannot modify any non-static data members or call any member functions that aren't constant.

哪一部分没有意义?



那么可以在此常量函数中修改静态数据成员吗?"


阅读上面的短语:
常量成员函数不能修改任何非静态数据成员"

What part of that does not make sense?



"then is it possible to modify the static data members in this constant function?"


Read the phrase above:
"A constant member function cannot modify any non-static data members"

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