memcpy

[Mihulik]

Hi,
is it correct(I mean "norm correct") to use "overlap" pointers as parameters of memcpy function from memory.h header?
Example:

//move 3 elements of the array one place to the right
int someArray[5];
memcpy(someArray + 1, someArray, sizeof(int) * 3);

Is it correct?


I could try it of course (and I did it) but memory problems are disgusting as you surely know so I want to be sure about it.



Thank you!

[jsmith]

No, if the source and destination buffers overlap you must use memmove instead.

[iharrold]

Results are undefined due to the overlap. If the memory was in the same block but didn't overlap, then its perfectly fine.

[Mihulik]

It's exactly what I need to know.

Thank you so much!