Struct Version 

pub struct Version(/* private fields */);

Represents the version of a slot, combining generation and state.

The lowest 2 bits represent the state:

• 0b00: Vacant
• 0b01: Reserved
• 0b10: Retired (the maximum generation was exhausted)
• 0b11: Occupied

The upper 30 bits represent the generation.

表示 slot 的版本，结合了代数（generation）和状态。

最低 2 位表示状态：

• 0b00: 空闲 (Vacant)
• 0b01: 预留 (Reserved)
• 0b10: 退休 (Retired，最大代数已耗尽)
• 0b11: 占用 (Occupied)

高 30 位表示代数。

Implementations

impl Version

pub const fn new(generation: Generation, state: u32) -> Option<Self>

Create a new Version with specified generation and state

使用指定的代数和状态创建一个新 Version

Returns None for an invalid state or when the retired state is used with a generation other than Generation::MAX.

pub fn sentinel() -> Self

Create a sentinel version

创建哨兵版本

pub fn generation(&self) -> Generation

Get the generation part

获取代数部分

pub fn state(&self) -> u32

Get the state part (lowest 2 bits)

获取状态部分（最低 2 位）

pub fn is_vacant(&self) -> bool

Check if logic state is Vacant (0b00)

检查逻辑状态是否为空闲 (0b00)

pub fn is_reserved(&self) -> bool

Check if logic state is Reserved (0b01)

检查逻辑状态是否为预留 (0b01)

pub fn is_occupied(&self) -> bool

Check if logic state is Occupied (0b11)

检查逻辑状态是否被占用 (0b11)

pub fn is_retired(&self) -> bool

Check if the slot has exhausted its generation counter and can never be reused.

Trait Implementations

impl Clone for Version

fn clone(&self) -> Version

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Version

impl Debug for Version

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

Formats the value using the given formatter.

impl Eq for Version

impl PartialEq for Version

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Version