c++ - How to call a function from any class by a pointer to it? -

i'm building engine. need create timer class call function pointer separate class. example:

class mytimer { public:     void settimeoutfunction( _pointer_, unsigned short timeoutms ) {         // here need have opportunity store _pointer_ function     }     void ticktimer() {         ...         // here need call function pointer         ...     } };  // main class: class myanyclass { public:     void start() {         mytimer mytimer;         mytimer.settimeoutfunction( startthisfunc, 1500 ); // 1500ms = 1.5s         while ( true ) {             mytimer.ticktimer();         }     }     void startthisfunc() { ... } } 

in summation, how store pointer function belongs class , call function pointer?

for requirements, might recommend making timer class template:

template <typename t> struct mytimer {     using funcptr = void (t::*)();      mytimer(funcptr ptr, t * obj, unsigned int timeout_ms)     : ptr_(ptr), obj_(obj), timeout_ms_(timeout_ms) {}      void ticktimer()     {         (obj_->*ptr_)();     }      funcptr ptr_;     t * obj_;     unsigned int timeout_ms_; }; 

usage:

struct myanyclass {     void start()     {         mytimer<myanyclass> mytimer(&myanyclass::startthisfunc, this, 1500);         while (true) { mytimer.ticktimer(); }     }      void startthisfunc() { /* ... */ } };