如何从 C++ 中的单独类访问静态映射?

我想访问存储在单独类中的静态映射，并循环访问和打印内容。

所以我有三个文件：

HasGlobals.cpp它有全球地图。

/* HasGlobals.cpp */
#include <string>
#include <map>
#include <iostream>
class HasGlobals{
public:
static std::map<int, std::string> globalData;
HasGlobals(){
globalData.insert(std::pair<int, std::string>(0, "data"));
};
~HasGlobals(){
};
};

WantsGlobals.cpp它有一个方法需要使用HasGlobals的map.cpp作为其方法之一。

/* WantsGlobals.cpp */
#include "HasGlobals.cpp"
#include <string>
class WantsGlobals{
public:
WantsGlobals(){
};
~WantsGlobals(){
};
//THIS IS THE METHOD THAT I CAN'T GET TO WORK
void printContentsOfGlobal(){
HasGlobals * globalRetriever = new HasGlobals();
for(std::map<int, std::string>::iterator it = globalRetriever->globalData.begin(); it != globalRetriever->globalData.end(); ++it){
std::cout << it->first << " " << it->second << std::endl;
}
};
};

Main.cpp它只是尝试在 WantsGlobals.cpp 中调用 printContentOfGlobal() 方法。

/* Main.cpp */
#include <iostream>
#include "WantsGlobals.cpp"
int main(){
WantsGlobals * globalRetriever = new WantsGlobals();
globalRetriever->printContentsOfGlobal();
}

现在这段代码无法编译并给了我

对"HasGlobals：：globalData"的未定义引用

我将如何实现printContentOfGlobal()，以便我可以在单独的HasGlobals.cpp文件中检索map[globalData]中的数据？

编辑：感谢大家的帮助。 以下是我在大家的帮助下创建的代码。 是的，它仍然不完美，但它编译并执行所需的行为：

HasGlobals.hpp

#include <string>
#include <map>
#include <iostream>
class HasGlobals{
public:
static std::map<int, std::string> globalData;
HasGlobals(){};
~HasGlobals(){};
static std::map<int, std::string> createDummyData(){
std::map<int, std::string> m;
m[0] = "Help";
m[1] = "Me";
m[2] = "Stackoverflow";
m[3] = "You're my only hope.";
return m;
}
};
std::map<int, std::string> HasGlobals::globalData = HasGlobals::createDummyData();

WantsGlobals.hpp

#include "HasGlobals.hpp"
#include <string>
#include <map>
class WantsGlobals{
public:
WantsGlobals(){};
~WantsGlobals(){};
void printContentsOfGlobal(){
for(std::map<int, std::string>::iterator it = HasGlobals::globalData.begin(); it != HasGlobals::globalData.end(); ++it){
std::cout << it->first << " " << it->second << std::endl;
}
};
};

主.cpp

#include <iostream>
#include <"WantsGlobals.hpp">
int main(){
WantsGlobals * globalRetriever = new WantsGlobals();
globalRetriever->printContentsOfGlobal();
}