Singleton.h

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/*
 * Copyright (C) 2015 Niek Linnenbank
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef __LIB_LIBSTD_SINGLETON_H
#define __LIB_LIBSTD_SINGLETON_H
 
template <class T> class StrictSingleton
{
  public:
 
    static inline T * instance()
    {
        static T obj;
        return &obj;
    }
};
 
template <class T> class WeakSingleton
{
  public:
 
    WeakSingleton<T>(T *obj)
    {
        m_instance = obj;
    }
 
    static inline T * instance()
    {
        return m_instance;
    }
 
  private:
 
    static T *m_instance;
};
 
/* Initialize the static member obj. */
template <class T> T* WeakSingleton<T>::m_instance = 0;
 
#endif /* __LIB_LIBSTD_SINGLETON_H */