For better handling of resource leaks, try “marking” the allocation with ancillary information:
#include #include #include #include typedef void FDEL(void* p, size_t size);typedef FDEL* PFDEL;class A{ int a; static void sfree(void* p, size_t size); static void sfreedebug(void* p, size_t size);public: virtual ~A() {} void* operator new(size_t size); void operator delete(void* p, size_t size); void* operator new(size_t size, char* Tag); };void A::operator delete(void* p, size_t size){ char* pb = (char*) p; pb -= sizeof(PFDEL); PFDEL pfdel = *(PFDEL*)pb; (*pfdel)(pb, size);}void A::sfree(void* p, size_t size){ free(p);}void* A::operator new(size_t size){ char* pb = (char*) malloc(size + sizeof(PFDEL)); *(PFDEL*)pb = &sfree; return (pb + sizeof(PFDEL));}struct DEBUGHDR{ size_t size; char* Tag; PFDEL pfdel;};void A::sfreedebug(void* p, size_t size){ char* pb = (char*) p; pb += (sizeof(PFDEL) - sizeof(DEBUGHDR)); DEBUGHDR* phdr = (DEBUGHDR*) pb; assert(size == phdr->size); cout << "freeing " << phdr->size << " For class " << phdr->Tag << "
"; free(pb);}void* A::operator new(size_t size, char* inTag){ char* pb = (char*) malloc(size + sizeof(DEBUGHDR)); DEBUGHDR* phdr = (DEBUGHDR*) pb; phdr->size = size; phdr->Tag= Tag; phdr->pfdel = &sfreedebug; cout << "new'ing " << phdr->size << " For class" << phdr->Tag << "
"; return (pb + sizeof(DEBUGHDR));}class B : public A{ double b;};main(){ A* pa1 = new A; B* pb1 = new B; A* pa2 = new("A") A; B* pb2 = new("B") B; delete pa1; delete pb1; delete pa2; delete pb2; return 0;} 
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