~cpp
#include <iostream>
using namespace std;
template <typename T>
inline void SAFE_DELETE(T*& arg)
{
if(arg)
{
delete arg;
arg = NULL;
}
}
int main()
{
int* i = new int(5);
SAFE_DELETE(i);
SAFE_DELETE(i);
SAFE_DELETE(i);
SAFE_DELETE(i);
return 0;
}