factory.hh

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/*
    @@@@@@@@  @@           @@@@@@   @@@@@@@@ @@
   /@@/////  /@@          @@////@@ @@////// /@@
   /@@       /@@  @@@@@  @@    // /@@       /@@
   /@@@@@@@  /@@ @@///@@/@@       /@@@@@@@@@/@@
   /@@////   /@@/@@@@@@@/@@       ////////@@/@@
   /@@       /@@/@@//// //@@    @@       /@@/@@
   /@@       @@@//@@@@@@ //@@@@@@  @@@@@@@@ /@@
   //       ///  //////   //////  ////////  //

   Copyright (c) 2016, Triad National Security, LLC
   All rights reserved.
                                                                              */
#pragma once

#include <iostream>
#include <map>

namespace flecsi {
namespace utils {

template<typename RETURN, typename KEY, typename... Args>
class Factory_
{
public:
  using createHandler = RETURN * (*)(Args... args);

  using key_t = KEY;

  using map_t = std::map<key_t, createHandler>;

  Factory_(const Factory_ & f) = delete;

  Factory_ & operator=(const Factory_ &) = delete;

  static Factory_ & instance() {
    static Factory_ f;
    return f;
  } // instance

  bool registerType(const key_t key, const createHandler ch) {
    return map_.insert(typename map_t::value_type(key, ch)).second;
  } // registerType



  RETURN * create(const key_t key, Args &&... args) {
    // lookup the create class
    typename map_t::const_iterator ita = map_.find(key);

    // make sure that the id exists in the map
    if(ita == map_.end()) {
      std::cerr << "Error Unknown Type ID" << std::endl;
      std::exit(1);
    } // if

    // call the constructor method
    return (ita->second(std::forward<Args>(args)...));
  } // create

private:
  map_t map_;

  Factory_() {}
  ~Factory_() {}

}; // class Factory_

} // namespace utils
} // namespace flecsi