C++中的静态成员错误 [英] Static member error in c++

问题描述

我正在尝试在 C++ 中定义一个静态成员指针.但是我收到链接器错误.错误是

I am trying to define a static member pointer in C++. However I get a linker error. The error is

1>main.obj : error LNK2001: unresolved external symbol "public: static class Activity * * Solution::temp" (?temp@Solution@@2PAPAVActivity@@A)

1>Solution.obj : error LNK2001: unresolved external symbol "public: static class Activity * * Solution::temp" (?temp@Solution@@2PAPAVActivity@@A)

代码:

class Solution{

public:
    Activity **solution;

    Solution();
    Solution(Activity **list, bool direction);
    static Activity** temp;
};

Activity 是另一个类.我该如何解决这个问题?

Activity is another class. How can I solve this problem?

推荐答案

你必须添加定义:

Activity** Solution::temp = 0;

到实现类解决方案的文件.

to the file that implements the class Solution.

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