静态类成员的初始化 [英] Initialization of Static Class members

问题描述

如果我尝试初始化 obj_s 它要求我使它 const - 我不能这样做必须保留我创建对象的数量。

If i try to initialize obj_s it asks me to make it const - and i cant do that for i have to keep count of my Created Objects.

#include<iostream>

class A
{
        static int obj_s=0;
public: 
        A(){ ++obj_s;cout << A::obj_s << "\nObject(s) Created\n"; }
}; 

int main()
{
A a,b,c,d;
}    

下面的代码会给出以下错误：

The code below keeps giving me the following error:

  [Linker error] undefined reference to `A::obj_s' 

推荐答案

[已解决]

代码提供错误，在第二种情况下创建，并且在其第一次它不初始化，它的应该的方式 -
这里是固定的代码：

The code is giving the error because the object is not getting created in the second case, and in the first its not initializing, the way its supposed to - Here's the fixed Code:

#include<iostream>
class A
{
        static int obj_s;
public: 
        A()
{  obj_s++;  std::cout << A::obj_s << "\nObject(s) Created\n" ;  }
}; 

int A::obj_s=0;  // This is how you intialize it

int main()
{
A a ,b,c,d;
}

这篇关于静态类成员的初始化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IT屋！