text: /*
   * Copyright 2018 <copyright holder> <email>
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #ifndef EVENTCALLBACK_H
  #define EVENTCALLBACK_H
  
  /**
   * @todo write docs
   */
  class IEventCallback
  {
  public:
      virtual void operator() () = 0;
      virtual bool operator == (IEventCallback* other) = 0;
  };
  
  template<typename T>
  class EventCallback : public IEventCallback
  {
  public:
      EventCallback(T* instance, void (T::*function)())
          : instance(instance), function(function) {}
  
      void operator () () {
          (instance->*function)();
      }
      virtual bool operator == (IEventCallback* other) override
      {
          EventCallback* otherEventCallback = dynamic_cast<EventCallback*>(other);
          if (otherEventCallback == nullptr)
              return false;
  
          return 	(this->function == otherEventCallback->function) &&
                  (this->instance == otherEventCallback->instance);
      }
      /**
       * Destructor
       */
      ~EventCallback();
  private:
      void (T::*function)();
      T* instance;
  };
  
  #endif // EVENTCALLBACK_H
  