静态成员和LNK错误在C ++ [英] static members and LNK error in C++

问题描述

我有一个类有静态成员，我想在类构造函数中使用，但代码不编译，我留下这些错误：

致命错误LNK1120：1未解析的外部

LNK2001：未解析的外部符号protected：static class Collection A :: collection

任何帮助将被感激。
谢谢。

ah

  class A 
 {
 protected：
 static Collection< A *>集合; 
}; 
  

a.cpp

  A :: A（）{
 A :: collection.push_back（this）; 
} 
  

解决方案

您需要添加

  ; A *> A :: collection; 
  

I have a class that has a static member, which I want to use in the class constructor, but the code doesn't compile, and I'm left with these errors:

"fatal error LNK1120: 1 unresolved externals"

"error LNK2001: unresolved external symbol "protected: static class Collection A::collection"

Any help will be appreciated. Thanks.

"a.h"

class A
{
protected:
 static Collection<A*> collection;
};

"a.cpp"

A::A() {
 A::collection.push_back(this);
}

解决方案

You need to add

Collection<A*> A::collection;

to your a.cpp file.

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