结构体 Id 

pub struct Id(/* 私有字段 */);

唯一标识一个任务（相对于所有其他当前正在运行的任务）的不透明 ID。

仅在同时满足以下两个条件时，任务的 ID 才能被另一个任务重用：

1. The task itself exits.
2. There is no active JoinHandle associated with this task.

在以下情况下，JoinHandle 被视为活动状态：

• You are explicitly holding a JoinHandle, AbortHandle, or tokio_util::task::AbortOnDropHandle.
• The task is being tracked by a JoinSet or tokio_util::task::JoinMap.

注意

• Task IDs are not sequential, and do not indicate the order in which tasks are spawned, what runtime a task is spawned on, or any other data.
• The task ID of the currently running task can be obtained from inside the task via the task::try_id() and task::id() functions and from outside the task via the JoinHandle::id() function.

trait 实现

impl Clone for Id

fn clone(&self) -> Id

返回值的副本。 更多信息

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. 更多信息

impl Debug for Id

fn fmt(&self, f: &mut Formatter<'_>) -> Result

使用给定的格式化器格式化此值。 更多信息

impl Display for Id

fn fmt(&self, f: &mut Formatter<'_>) -> Result

使用给定的格式化器格式化此值。 更多信息

impl Hash for Id

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. 更多信息

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. 更多信息

impl Ord for Id

fn cmp(&self, other: &Id) -> Ordering

This method returns an Ordering between self and other. 更多信息

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values. 更多信息

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values. 更多信息

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval. 更多信息

impl PartialEq for Id

fn eq(&self, other: &Id) -> bool

测试 self 与 other 值是否相等，供 == 运算符使用。

fn ne(&self, other: &Rhs) -> bool

测试 != 运算符。默认实现几乎总是够用，除非有非常充分的理由，否则不应被覆盖。

impl PartialOrd for Id

fn partial_cmp(&self, other: &Id) -> Option<Ordering>

若存在，此方法返回 self 与 other 值之间的排序关系。 更多信息

fn lt(&self, other: &Rhs) -> bool

测试小于（针对 self 与 other），供 < 运算符使用。 更多信息

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator. 更多信息

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator. 更多信息

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator. 更多信息

impl Copy for Id

impl Eq for Id

impl StructuralPartialEq for Id