从队列中删除unique_ptr [英] remove unique_ptr from queue

问题描述

我想弄清楚如何/如果我可以在队列中使用 unique_ptr >

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(); 

我明白为什么上面的代码不工作。由于前& pop 是两个单独的步骤，无法移动元素。有没有办法做这个？

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?

推荐答案

你应该明确说明你要移动指针出队列。像这样：

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();

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