Singleton in C++

Singleton.cpp

/**
* @file Singleton.cpp part of @file Singleton.hpp
* @version   2
*
* @author    Denis Colesnicov <eugustus@gmail.com>
* @date      2017/01/15
*
* @copyright WTFPL
*/

#include "Singleton.h"

Singleton* Singleton::m_instance = nullptr; 

Singleton* Singleton::getInstance()
{
  if(!m_instance){
    m_instance = new Singleton;
  }
  return m_instance;
}

Singleton.hpp

#pragma once

/**
* @file Singleton.hpp
* @version   2
*
* @brief     Realisation of pattern <SINGLETON>
* @details   Usage for Loggers, Loaders and similar possible situations.
*
* @author    Denis Colesnicov <eugustus@gmail.com>
* @date      2017/01/15
*
* @copyright WTFPL
*/

class Singleton{
public:
  
  /**
  * @brief Create and return instance of singleton
  * @pre The initialization occurs only once, then it will return the same instance of the class.
  * @return Singleton*
  */
  static Singleton* getInstance();
  
private:
  Singleton(){};
  Singleton(Singleton const&){};
  Singleton& operator=(Singleton const&){};
  static Singleton* m_instance;
  
};