while you can indeed swap in-place for PODs [1], this is not true for c++ objects. Also, in-place swapping is not sufficient for in-place sorting. [1] example:

while you can indeed swap in-place for PODs [1], this is not true for c++ objects. Also, in-place swapping is not sufficient for in-place sorting. [1] example: int a, b; a ^= b ^= a ^= b;