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/* bzflag
* Copyright (c) 1993-2025 Tim Riker
*
* This package is free software; you can redistribute it and/or
* modify it under the terms of the license found in the file
* named COPYING that should have accompanied this file.
*
* THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef __SINGLETON_H__
#define __SINGLETON_H__
// 1st
#include "common.h"
/* Singleton template class
*
* This template is based on an implementation suggested by Martin York in
* https://stackoverflow.com/a/1008289/9220132
*
* This template class pattern provides a traditional Singleton pattern.
* Allows you to designate a single-instance global class by inheriting
* from the template class.
*
* Example:
*
* class Whatever : public Singleton<Whatever> ...
*
* The class will need to provide an accessible default constructor
*
*/
template < typename T >
class Singleton
{
public:
/** returns a singleton
*/
static T& instance()
{
static T private_instance;
return private_instance;
}
Singleton(const Singleton &) = delete;
Singleton& operator=(const Singleton&) = delete;
protected:
Singleton() = default;
~Singleton() = default;
};
#endif /* __SINGLETON_H__ */
// Local Variables: ***
// mode: C++ ***
// tab-width: 4 ***
// c-basic-offset: 4 ***
// indent-tabs-mode: nil ***
// End: ***
// ex: shiftwidth=4 tabstop=4
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