IMalloc 의 Free 멤버 함수를 찾을수 없다고"에러 날때 어떻게 고쳐야 하나여?

./utility/shellclasses.h:319: error: ‘struct IMalloc’ has no member named ‘Free’ 

emplate<typename T> struct SShellPtr
{
   ~SShellPtr()
   {
      _malloc->Free(_p);//에러 난 부분
   }

   T* operator->()
   {
      return _p;
   }

   T const* operator->() const
   {
      return _p;
   }

   operator T const *() const
   {
      return _p;
   }

   const T& operator*() const
   {
      return *_p;
   }

   T& operator*()
   {
      return *_p;

#define IMalloc_Free(p,a) (p)->lpVtbl->Free(p,a)