C++ 全局std:：c+中的map变量+；

我需要在多个文件中使用std:：map变量。大多数示例都说，我需要在.h文件中将其声明为extern，并在任何一个.cpp文件上初始化。但是我没有看到std:：map变量上的更新值

例如： 配置.h

struct Action_Element {
    std::string algo_func_name;
    uint32_t opEventUid;
};

typedef std::map<int, Action_Element> EnActionList;
typedef std::map<int, Action_Element> ExActionList;
typedef std::map<size_t, string> CondExpStrList;

struct Transition_Elements {
    uint32_t              DesStateUid;
    uint32_t              TransCounterID;
    ExActionList          ExitActionList;
};

typedef std::map<uint32_t, Transition_Elements> TransitionList;

struct State_Element {
    bool              isTransitionCondAvailable;
    EnActionList      EntryActionList;
    TransitionList    TransitionList;
};

typedef std::map<uint32_t , State_Element> StateList;
extern StateList global_stateList;     // global state list

file3.cpp

#include "Config.h"

file3::file3()
{
   State_Element  file3StateElement;
   global_statList.insert(make_pair(3,file3StateElement);
}

file2.cpp

#include "Config.h"

file2::file2()
{
   State_Element  file2StateElement;
   global_statList.insert(make_pair(2,file2StateElement);
}

让我们不要考虑每个状态元素中的内容以及它是如何初始化的。

main.cpp

#include "Config.h"
StateList global_stateList;

int main(void) {

global_stateList.clear();
file1 *f1 = new file1();
file2 *f2 = new file2();
file3 *f3 = new file3();

StateList::const_iter iter = global_stateList.begin();
if(iter != global_stateList.end())
{
   printf("\n size of globalstateList : %d", global_stateList.size());
}

while(1);

}

---

复制品：@Angelus那怎么是复制品？OP在标题中声明了它

extern

，并提供了一个定义。

#include "Config.h"
StateList global_stateList;

int main(void) {

global_stateList.clear();
file1 *f1 = new file1();
file2 *f2 = new file2();
file3 *f3 = new file3();

StateList::const_iter iter = global_stateList.begin();
if(iter != global_stateList.end())
{
   printf("\n size of globalstateList : %d", global_stateList.size());
}

while(1);

}