GlobalsHandling.h

/*
 *  Copyright (C) 2005-2018 Team Kodi
 *  This file is part of Kodi - https://kodi.tv
 *
 *  SPDX-License-Identifier: GPL-2.0-or-later
 *  See LICENSES/README.md for more information.
 */

#pragma once

#include <memory>

namespace xbmcutil
{
  template <class T> class GlobalsSingleton
  {
    template <class K> class Deleter
    {
    public:
      K* guarded;
      ~Deleter() { if (guarded) delete guarded; }
    };

    static Deleter<std::shared_ptr<T> > instance;

    static T* quick;
  public:

    inline static std::shared_ptr<T> getInstance()
    {
      if (!instance.guarded)
      {
        if (!quick)
          quick = new T;
        instance.guarded = new std::shared_ptr<T>(quick);
      }
      return *(instance.guarded);
    }

    inline static T* getQuick()
    {
      if (!quick)
        quick = new T;

      return quick;
    }

  };

  template <class T> typename GlobalsSingleton<T>::template Deleter<std::shared_ptr<T> > GlobalsSingleton<T>::instance;
  template <class T> T* GlobalsSingleton<T>::quick;

  class InitFlag {  public:  explicit InitFlag(bool& flag) { flag = true; }  };
}

#define XBMC_GLOBAL_REF(classname,g_variable) \
  static std::shared_ptr<classname> g_variable##Ref(xbmcutil::GlobalsSingleton<classname>::getInstance())

#define XBMC_GLOBAL_USE(classname) (*(xbmcutil::GlobalsSingleton<classname>::getQuick()))