c++ 模板类 静态成员初始化问题

Question

template
class TimerApp
{
//friend class TimerApp;
typedef void (MessageHandlerClass::*HandlerMethod)();

public:
    static void AddTimer(int interval,MessageHandlerClass *handler);

private:
    static int interval_;
    static HandlerMethod handler_method_;     //回调函数指针
    static MessageHandlerClass*    handler_;    //调用对象
    static void OnTimer();

};

template int TimerApp::interval_ = 0;
template MessageHandlerClass * TimerApp::handler_ = 0;

请问handler_method_如何在类外初始化

补充：我尝试template HandlerMethod SubTimerApp::handler_method_ = 0;
报错：error: ‘HandlerMethod’ does not name a type

Answer 1

HandlerMethod handler_method_ = 0
不就行了，加那么多零碎是干嘛？