安全delete，添加refenerce,release

#ifndef SAFE_ADDREF
#define SAFE_ADDREF(p) if (p != NULL) { p->AddRef(); }
#endif

#ifndef SAFE_RELEASE
#define SAFE_RELEASE(p) if (p != NULL) { p->Release(); p = NULL; }
#endif

#define SAFE_DELETE(x) {if ((x)!=NULL) {delete (x); (x)=NULL;}}
#define SAFE_DELETEBUFF(x) {if((x)!=NULL) {delete [] (x); (x) = NULL;}}

#define SAFE_FREE(x) {if((x)!=NULL) {free(x); (x) = NULL;}}

int *b = new int[4];
   b[0] = 1;
   b[1] = 2;
   b[2] = 3;
   b[3] = 4;
    b[4] = '\0';

delete[] b;

b = NULL

char *array = (char*) malloc(sizeof(char) * 5);
   array[0] = 'a';
   array[1] = 'b';
   array[2] = 'c';
   array[3] = 'd';
   array[4] = '\0';

free(array);
array = NULL;

巴特西