singleton-definitions.h

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/* WOSS - World Ocean Simulation System -
 * 
 * Copyright (C) 2009 2025 Federico Guerra
 * and regents of the SIGNET lab, University of Padova
 *
 * Author: Federico Guerra - WOSS@guerra-tlc.com
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */ 
 
 
#ifndef SINGLETON_DEFINITIONS_H
#define SINGLETON_DEFINITIONS_H
 
#include <memory>
 
namespace woss {
 
  template< typename T >
  class Singleton {
 
    public:
 
    static T& instance();
 
#ifdef WOSS_NS_MIRACLE_SUPPORT
    static T* instance_ptr();
#endif // WOSS_NS_MIRACLE_SUPPORT
 
    ~Singleton() = default;
 
    Singleton() = delete;
 
    Singleton( const Singleton& copy ) = delete;
 
    Singleton( Singleton&& tmp ) = delete;
   
    Singleton& operator=( const Singleton& copy ) = delete;
 
    Singleton& operator=( Singleton&& tmp ) = delete;
  };
 
  template <typename T>
  inline T& Singleton<T>::instance() {
    // from C++11 this is guaranteed to be thread safe
    static auto the_instance = std::make_unique<T>();
    return *the_instance;
  }
 
#ifdef WOSS_NS_MIRACLE_SUPPORT
  template <typename T>
  inline T* Singleton<T>::instance_ptr() {
    // from C++11 this is guaranteed to be thread safe
    static auto the_instance = new T();
    return the_instance;
  }
#endif // WOSS_NS_MIRACLE_SUPPORT
}
 
#endif // SINGLETON_DEFINITIONS_H