联合可以包含数据成员以及可以对其进行操作的函数吗？ [英] Can a union contain data members as well as functions that can operate upon them?

问题描述

Can a union contain data members as well as functions that can operate upon them? 

我的尝试：



我没有尝试任何实际的东西，但只想清除这个概念。

What I have tried:

I havent tried anything practically but just want to clear the concept.

推荐答案

是：联盟声明 - cppreference.com [ ^ ]

工会 [ ^ ]。但是，正如微软所说，有比Unions更好的方法。

Unions[^]. However, as Microsoft note, there are better ways than Unions.

是（详见文档）。例如：

Yes (see the documentation for details). Try for instance:

#include <iostream>
using namespace std;

union U
{
  double d;
  int i;

  void incInt(){ ++i;}
  void showInt(){ cout << "int value is " << i << "\n";}
  void showDouble() { cout << "double value is " << d << "\n";}
};

int main()
{
  U u;
  u.i = 10;
  u.showInt();
  u.showDouble();
  u.incInt();
  u.showInt();
  u.showDouble();
}

请现代 C ++ 介绍 std :: variant 替代 union 。

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