I think he's referring to the cast: (double*)->(void*)->(double*) which should be fine. I'm guessing the original article author prefers using memcpy because th

I think he's referring to the cast: (double*)->(void*)->(double*) which should be fine. I'm guessing the original article author prefers using memcpy because there doesn't seem to be any performance cost and its correct in other situations where the alignment is wrong, or there is type aliasing. The advantage would be if you always use a safe method in a code base then you don't have to worry about proving that possibly unsafe methods are safe.