Заменить делегаты функциями обратного вызова

In file included from NMClient.cpp:14:0,
                 from main.cpp:1:
EventHandler.h: In member function ‘void EventHandler<EventArgs>::operator()(void*, EventArgs*)’:
EventHandler.h:34:8: error: need ‘typename’ before ‘std::list<void (*)(void*, EventArgs*)>::const_iterator’ because ‘std::list<void (*)(void*, EventArgs*)>’ is a dependent scope
   for (list<CallBackFunction>::const_iterator it = callBackList.cbegin(); it != callBackList.cend(); it++)
        ^
EventHandler.h:34:47: error: expected ‘;’ before ‘it’
   for (list<CallBackFunction>::const_iterator it = callBackList.cbegin(); it != callBackList.cend(); it++)
                                               ^
EventHandler.h:34:75: error: ‘it’ was not declared in this scope
   for (list<CallBackFunction>::const_iterator it = callBackList.cbegin(); it != callBackList.cend(); it++)
                                                                           ^
EventHandler.h: In member function ‘bool EventHandler<EventArgs>::operator==(int)’:
EventHandler.h:38:47: warning: NULL used in arithmetic [-Wpointer-arith]
  inline bool operator==(int a) { return (a == NULL) && (callBackList.size() == 0); }
                                               ^
EventHandler.h: In member function ‘bool EventHandler<EventArgs>::operator!=(int)’:
EventHandler.h:40:47: warning: NULL used in arithmetic [-Wpointer-arith]
  inline bool operator!=(int a) { return (a == NULL) && (callBackList.size() != 0); }

for (typename list<CallBackFunction>::const_iterator it = callBackList.cbegin(); it != callBackList.cend(); it++)

In file included from NMClient.cpp:14:0,
                 from main.cpp:1:
EventHandler.h: In member function ‘bool EventHandler<EventArgs>::operator==(int)’:
EventHandler.h:38:47: warning: NULL used in arithmetic [-Wpointer-arith]
  inline bool operator==(int a) { return (a == NULL) && (callBackList.size() == 0); }
                                               ^
EventHandler.h: In member function ‘bool EventHandler<EventArgs>::operator!=(int)’:
EventHandler.h:40:47: warning: NULL used in arithmetic [-Wpointer-arith]
  inline bool operator!=(int a) { return (a == NULL) && (callBackList.size() != 0); }

EventHandler<EventMsgArgs> OnError;
 
    void ErrorEvent(string msg){
        if (OnError != 0)
          OnError(this, new EventMsgArgs(msg));
    }

EventHandler<EventArgs> OnStop;
 
    void StopEvent(){
        if (OnStop != 0)
            OnStop(this, new EventArgs());
    }

void MyMeth1(void* obj, ClientEventArgs* args){
    
}
int main(){
    NMClient* client = new NMClient("127.0.0.1", 9000);
    client->OnStop += MyMeth1;
}

static const int null = 0;

inline bool operator==(int a) { return (a == NULL) && (callBackList.size() == 0); }