I've got a question which is hopefully a very simple one:  I have an
unmanaged DLL which has abstracted the memory management such that I
can supply the malloc and free methods.

 (ie)

void __nogc * pascal     myMalloc (struct tag_MemoryStream __nogc * pX,
size_t cb) ;

void   pascal            myFree (void __nogc * pX, void *ptr) ;

... I'd like to implement these methods such that I create and return a
managed array which is not GC'ed (ie GC::KeepAlive()) and returned,
then when myFree is called, I'd like to convert this back again (ie
GC::ReRegisterForFinalize( bytes )).  Does anyone have an idea of how
to best go about this in managed C++?