std::unique_ptr usage

Question

std::unique_ptr p1(new int);
std::unique_ptr p2(new int);
p2=p1;

It seems here that p1 is no longer \"unique\" since p2 refer to

Answer 1

std::unique_ptr is non-assignable and non-copyable. You need to use std::move();

so

p1 = std::move(p2);

Have a look here for more info.