当我的类有静态成员时，为什么我的C ++程序不会链接？ [英] Why won't my C++ program link when my class has static members?

问题描述

我有一个名为Stuff的类，我想存储的东西。这些东西是int类型的列表。在我的代码中，无论我使用什么类，我想要能够访问这些东西在Stuff类中。

I have a little class called Stuff that I want to store things in. These things are a list of type int. Throughout my code in whatever classes I use I want to be able to access these things inside the Stuff class.

Main.cpp：

#include "Stuff.h"

int main()
{
    Stuff::things.push_back(123);
    return 0;
}

Stuff.h：

#include <list>

class Stuff
{
public:
    static list<int> things;
};

但我使用此代码遇到一些生成错误：

but I get some build errors with this code:

错误LNK2001：未解析的外部符号public：std :: list

error LNK2001: unresolved external symbol "public: static class std::list<int,class std::allocator<int> > Stuff::things" (?things@Stuff@@2V?$list@HV?$allocator@H@std@@@std@@A) Main.obj CSandbox

致命错误LNK1120：1未解决的外部C： \Stuff\Projects\CSandbox\Debug\CSandbox.exe CSandbox

fatal error LNK1120: 1 unresolved externals C:\Stuff\Projects\CSandbox\Debug\CSandbox.exe CSandbox

我是一个C＃人，我试图学习C ++的一个副项目。我想我不明白C ++如何处理静态成员。

I am a C# guy, and I am trying to learn C++ for a side project. I think that I don't understand how C++ treats static members. So please explain what I have got wrong here.

推荐答案

在类声明中提到一个静态成员是一个声明

Mentioning a static member in a class declaration is a declaration only. You must include one definition of the static member for the linker to hook everything up properly. Normally you would include something like the following in a Stuff.cpp file:

#include "Stuff.h"

list<int> Stuff::things;

一定要包括 Stuff.cpp 您的程序以及 Main.cpp 。

Be sure to include Stuff.cpp in your program along with Main.cpp.

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