EventEmitter.h

//-*-C++-*-
/***************************************************************************
 *
 *   Copyright (C) 2019 by Dean Shaff, Andrew Jameson and Willem van Straten
 *   Licensed under the Academic Free License version 2.1
 *
 ***************************************************************************/
 
#ifndef __EventEmitter_h
#define __EventEmitter_h
 
#include <string>
#include <vector>
#include <map>
#include <iostream>
 
template<typename FuncType>
class EventEmitter {
 
public:
 
  EventEmitter ();
 
  void on (const std::string& event_name, FuncType func);
 
  void on (const std::string& event_name, FuncType* func);
 
  template<class ... Types>
  void emit (const std::string& event_name, Types ... args);
 
private:
 
  std::map<std::string, std::vector<FuncType*> > event_map;
 
};
 
 
template<typename FuncType>
EventEmitter<FuncType>::EventEmitter ()
{ }
 
template<typename FuncType>
void EventEmitter<FuncType>::on(const std::string& event_name, FuncType _func)
{
  on(event_name, &_func);
}
 
template<typename FuncType>
void EventEmitter<FuncType>::on(const std::string& event_name, FuncType* _func)
{
  if (event_map.find(event_name) == event_map.end()) {
    event_map[event_name] = {_func};
  } else {
    event_map[event_name].push_back(_func);
  }
}
 
template<typename FuncType>
template<class ... Types>
void EventEmitter<FuncType>::emit (const std::string& event_name, Types ... args)
{
  if (event_map.find(event_name) != event_map.end())
  {
    auto func_b = event_map[event_name].begin();
    auto func_e = event_map[event_name].end();
    for (; func_b != func_e; func_b++) {
      (**func_b)(args...);
    }
  }
}
 
#endif