too-many-lists/unsafe-queue/basics

[giscus[bot]]

too-many-lists/unsafe-queue/basics

https://course.rs/too-many-lists/unsafe-queue/basics.html

[songchengen]

请教个问题：

pub fn pop(&mut self) -> Option<T> {
    self.head.take().map(|head| {
        // 为啥要加这一行呢
        let head = *head;
        self.head = head.next;

        if self.head.is_none() {
            self.tail = ptr::null_mut();
        }

        head.elem
    })
}

[zhengjiaw]

看上去就是将 Box<Node> 中的 Node move 到了 栈上，不加也行吧，编译也没报错

[apodemakeles]

其实不用加