C ++由静态数据字段引起的消费者文件中的错误链接 [英] C++ Error linking in consumer file caused by static data field

问题描述

我想使用静态全局变量作为互斥体。当我尝试编译以下代码：

I want to use a static global variable as a mutex. When I try to compile the following code:

//header file

class __declspec(dllexport) StateConservator
{
private:
    StateConservator();
    StateConservator(const StateConservator&);

protected:
    const CString m_oldConf;
    CContainer& m_container;
    static bool x_mutex;
public:
    StateConservator(CContainer& container, const CString& conf)
        : m_container(container)
        , m_oldConf(!x_mutex? container.GetConf():_T(""))
    {
        if(!x_mutex)
        {
            x_mutex= true;
            m_container.SetConf(conf);
        }
    }

    ~StateConservator()
    {
        if(x_mutex)
        {
            x_mutex= false;
            m_container.SetConf(m_oldConf);
        }
    }
};


//cpp file
bool StateConservator::x_mutex= false;


//consumer file
StateConservator cs(*pContainer, pDoc->GetConfiguration());

我得到错误：

code> Consumer.obj：error LNK2001：未解析的外部符号protected：static bool StateConservator :: x_mutex（？x_mutex @ StateConservator @@ 1_NA）

Consumer.obj : error LNK2001: unresolved external symbol "protected: static bool StateConservator::x_mutex" (?x_mutex@StateConservator@@1_NA)

请问我该如何解决问题？

Please, how can I solve the problem?

UPDATE

我创建了两个最小的程序只包含测试问题的关键部分，他们工作！这更奇怪了！

I created two minimal programs containing only the essential part to test the problem and they work! This is getting even more strange!

更新2

请注意

Notice the __declspec(dllexport) declaration after the class, that was missing.

推荐答案

对不起，人们。

我在属于项目的文件中定义了StateConservator的代码。但后，我意识到，这将更有意义在另一个文件。

I was defining the code of StateConservator in a file belonging to the project. But after I realized it would make more sense in another file.

我没有意识到第二个文件是另一个解决方案的一部分。所以，我没有编译第二个解决方案，因此错误。

I was not realizing the second file was part of another solution. So, I did not compile the second solution, hence the error.

我想我需要一个扩展Visual Studio来着色其他项目的选项卡与另一种颜色。

I think I need an extension to Visual Studio to colorize the tabs of other projects with another color. If somebody knows about one, I will appreciate.

感谢您支持我造成的烦恼。

Thanks for supporting the annoyance caused by me.

strong> UPDATE

UPDATE

请注意类后缺少 __ declspec（dllexport）声明。

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