Trait Id 

pub trait Id:
    Copy
    + Clone
    + Eq
    + PartialEq
    + Debug
    + Into<u64>
    + From<u64> {
    const NONE: Self;

    // Provided methods
    fn none() -> Self { ... }
    fn is_none(&self) -> bool { ... }
    fn as_u64(&self) -> u64 { ... }
    fn from_u64(val: u64) -> Self { ... }
}

Id 基础 trait，所有自定义 Id 需实现此 trait

Required Associated Constants

const NONE: Self

Provided Methods

fn none() -> Self

fn is_none(&self) -> bool

fn as_u64(&self) -> u64

快速转换为 u64

fn from_u64(val: u64) -> Self

从 u64 构建 Id

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl Id for DefaultId

const NONE: Self