Enum Identifier

pub enum Identifier {
    ContextReference,
    RootReference,
    CallbackReference,
    Null,
}

特殊标识符枚举 定义了表达式中的特殊标识符

Variants

ContextReference

RootReference

CallbackReference

Null

Trait Implementations

impl Clone for Identifier

fn clone(&self) -> Identifier

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Identifier

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

Formats the value using the given formatter.

impl Display for Identifier

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

Formats the value using the given formatter.

impl<'_derivative_strum> From<&'_derivative_strum Identifier> for &'static str

fn from(x: &'_derivative_strum Identifier) -> &'static str

Converts to this type from the input type.

impl From<Identifier> for &'static str

fn from(x: Identifier) -> &'static str

Converts to this type from the input type.

impl FromStr for Identifier

type Err = ParseError

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Identifier, <Self as FromStr>::Err>

Parses a string s to return a value of this type.

impl PartialEq for Identifier

fn eq(&self, other: &Identifier) -> 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 TryFrom<&str> for Identifier

type Error = ParseError

The type returned in the event of a conversion error.

fn try_from(s: &str) -> Result<Identifier, <Self as TryFrom<&str>>::Error>

Performs the conversion.

impl Copy for Identifier

impl Eq for Identifier

impl StructuralPartialEq for Identifier