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

http://opengroup.org/onlinepubs/007908775/xsh/realloc.html

Upon successful completion with a size not equal to 0, realloc() returns a pointer to the (possibly moved) allocated space.

Nope, no guarantee