repos/Callback_14/Callback_14.cpp

#include <array>
#include <vector>
#include <map>
#include <iostream>
#include <functional>
#include "Header.h"


/*
 *  https://stackoverflow.com/questions/2298242/callback-functions-in-c
 *  https://codereview.stackexchange.com/questions/259525/c-generic-callback-class-with-removable-listeners-by-unique-id
 */

/************************************************************************************
 *
 */
void player_jump(cEvents& e) {

    std::cout << "player jump - " <<  "x: " << e.x << " / y: " << e.y << std::endl;
    e.x = 36;
    e.y = 47;
};

void player_crouch(cEvents& e) {

    std::cout << "player crouch - " << "x: " << e.x << " / y: " << e.y << std::endl;
}

/************************************************************************************
 *
 */
 class game_core : public cEvents
 {
    // empty eventhandler (default)
    static void emptyEvent(cEvents& e) { std::cout << "empty event handler" << std::endl; }

 public:
    std::array<void(*)(cEvents&), 6> actions;

    template<class T, class S>
    std::array<void(*)(T&, S&), 6> actions_c;


/************************************************************************************
 *
 */
    game_core() {  actions.fill(&emptyEvent);  }
    
/************************************************************************************
 *
 */
    void execEvent(cEvents& e)
    {
        if (actions[e.code]) actions[e.code](e);
    }

/************************************************************************************
 *   update keybind from menu
 */
    void addEventCb(enum e_event_code key_id, void(*new_action)(cEvents&))
    {
        actions[key_id] = new_action;
    }

/************************************************************************************
 *
 */
    template<class T, class S>
    void addEventCb1(enum e_event_code key_id, void (*new_action) (T*, S*))
    {
        actions[key_id] = new_action;
    }

/************************************************************************************
 *   update keybind from menu
 */
  void delEventCb(enum e_event_code key_id)
  {
      actions[key_id] = &emptyEvent;
  }
};

/************************************************************************************
 *   
 */
 // template<class T, class S>
 void player_gen(game_core * src, myModel* dest) {
     std::cout << "player generic" << std::endl;
     return;
 }

  // template <class T, class S>
  std::function< void(game_core*, myModel*) > callback;


/************************************************************************************
 *
 */
 int main() {
    game_core gc;
    myModel mym;
    cEvents e;

    gc.addEventCb(REDRAW, &player_jump);
    gc.addEventCb(EVENT_PRESSED, &player_crouch);

    auto cb = &player_gen; 

    callback = &player_gen;
    gc.addEventCb1(EVENT_PRESSED, cb); 

#if 0
    gc.addEventCb1(EVENT_PRESSED, &player_gen);    
#else
    // player_gen(&gc, &mym);
#endif

    e.code = EVENT_PRESSED;
    e.x = 12;
    e.y = 24;
    gc.execEvent(e);

    e.code = REDRAW;
    e.x = 39;
    e.y = 41;
    gc.execEvent(e);

    return 0;
 }