remove unique_ptr from queue

Question

I'm trying to figure out how/if I can use unique_ptr in a queue.

// create queue std::queue<std::unique_ptr<int>> q;  // add element std::unique_ptr<int> p (new int{123}); q.push(std::move(p));  // try to grab the element auto p2 = foo_queue.front(); q.pop();  

I do understand why the code above doesn't work. Since the front & pop are 2 separate steps, the element cannot be moved. Is there a way to do this?

Answer 1

You should say explicitly that you want to move the pointer out of the queue. Like this:

std::unique_ptr<int> p2 = std::move(q.front()); q.pop();