来个内存泄漏/野指针的小例子

typedef unsigned short int USHORT;

#include

int main()

{

   USHORT * pInt = new USHORT;

   *pInt = 10;

   std::cout << "*pInt: " << *pInt << std::endl;

   delete pInt;

   long * pLong = new long;

   *pLong = 90000;

   std::cout << "*pLong: " << *pLong << std::endl;

   *pInt = 20;      // uh oh, this was deleted! 这里的bug引发后面的//*pLong: 65556，前面的bug引发后面未知的威胁

   std::cout << "*pInt: " << *pInt  << std::endl;            //危险

   std::cout << "*pLong: " << *pLong  << std::endl;        //被影响

   delete pLong;

   return 0;

}

前面的BUG引发后面未知的错误 

typedef unsigned short int USHORT;

#include

int main()

{

   USHORT * pInt = new USHORT;

   *pInt = 10;

   std::cout << "*pInt: " << *pInt << std::endl;

   delete pInt;                  //释放内存

   pInt = 0;                      //空指针，后面再*pInt = 20;则程序崩溃

   delete pInt;               //安全没效果，紧接着两次delete pInt将崩溃

   long * pLong = new long;

   *pLong = 90000;

   std::cout << "*pLong: " << *pLong << std::endl;

//   *pInt = 20;      // uh oh, this was deleted! *pLong: 65556

//pInt是空指针，将崩溃，后面的得不到执行

//   std::cout << "*pInt: " << *pInt  << std::endl;   

//pInt是空指针，将崩溃，后面的得不到执行

   std::cout << "*pLong: " << *pLong  << std::endl;

   delete pLong;

   return 0;

}