can realloc move pointer if new size smaller?

Question

I am wondering whether the C or C++ standard guarantees that a pointer is not changed when realloc is called with a smaller (nonzero) size:

size_t n=1000;
T*         


        

Answer 1

On Windows, the C-Runtime grabs a heap, and then allocates memory from that heap. So the OS won't know about individual memory allocations, and thus won't move things around.