单例模式

#include <stdio.h>
#include <string>

class DriverManger
{
private:
  long m_nDate;
  int m_nDriverNum;
  std::string m_strDriverInfo;
  static DriverManger* theDriver;

private:
  DriverManger();
  DriverManger(long data, int num, std::string& str);

public:
  static DriverManger* GetInstance(void);
};

DriverManger* DriverManger::theDriver = nullptr;

DriverManger::DriverManger()
{
}

DriverManger::DriverManger(long data, int num, std::string& str) : m_nDate(data), m_nDriverNum(num), m_strDriverInfo(str)
{
}

DriverManger* DriverManger::GetInstance()
{
  if (nullptr == theDriver)
  {
    theDriver = new DriverManger();
  }
  
  return theDriver;
}

int main(void)
{
  DriverManger* pDriver = DriverManger::GetInstance();
  DriverManger* pDriver2 = DriverManger::GetInstance();
  printf("%p && %p \n", pDriver, pDriver2);

  getchar();

  return 0;
}

单例模式

原文：https://www.cnblogs.com/xiongyungang/p/13098582.html