Enum Mutability 

pub enum Mutability {
    Immutable,
    System,
    Module,
}

Variants

Immutable

不可变变量，不允许任何修改

System

公开可变变量，允许在任何上下文中修改

Module

模块级可变变量，只在同一模块内允许修改

Implementations

impl Mutability

pub fn is_default(&self) -> bool

检查是否为默认值，用于序列化优化

pub fn immutable() -> Self

创建不可变作用域

pub fn system() -> Self

创建公开可变作用域

pub fn module() -> Self

创建模块级可变作用域

pub fn model() -> Self

👎Deprecated: renamed to module() for clarity

pub fn from_immutable_flag(immutable: Option<bool>) -> Self

为向后兼容，从旧格式的 Option 转换

pub fn to_immutable_flag(&self) -> Option<bool>

转换为旧格式，用于向后兼容

Trait Implementations

impl Clone for Mutability

fn clone(&self) -> Mutability

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Mutability

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

Formats the value using the given formatter.

impl Default for Mutability

fn default() -> Mutability

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Mutability

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for Mutability

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for Mutability

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Mutability