Enum Constant

pub enum Constant {
    Null,
    Bool(bool),
    Int(i64),
    Uint(u64),
    Double(f64),
    Bytes(BytesValue),
    String(StringValue),
    Duration(Duration),
    Timestamp(DateTime<Utc>),
}

CEL constant value.

Constant represents constant values known at compile time, supporting CEL’s basic data types. Constants can be used for compile-time optimization and type inference.

Supported Types

• Null: Null value
• Bool: Boolean value
• Int: 64-bit signed integer
• Uint: 64-bit unsigned integer
• Double: 64-bit floating point number
• String: UTF-8 string
• Bytes: Byte array
• Duration: Time duration
• Timestamp: Timestamp

Examples

use cel_cxx::Constant;

let null_const = Constant::Null;
let bool_const = Constant::Bool(true);
let int_const = Constant::Int(42);
let string_const = Constant::String("hello".to_string().into());

Variants

Null

Null constant

Bool(bool)

Boolean constant

Int(i64)

Signed integer constant

Uint(u64)

Unsigned integer constant

Double(f64)

Floating point constant

Bytes(BytesValue)

Byte array constant

String(StringValue)

String constant

Duration(Duration)

Duration constant

Timestamp(DateTime<Utc>)

Timestamp constant

Implementations

impl Constant

pub fn value_type(&self) -> ValueType

Returns the type of the constant.

Returns the CEL type corresponding to the constant value.

pub fn value(&self) -> Value

Converts the constant to a CEL value.

Converts the constant to the corresponding Value type.

Trait Implementations

impl Clone for Constant

fn clone(&self) -> Constant

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Constant

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

Formats the value using the given formatter.

impl Default for Constant

fn default() -> Constant

Returns the “default value” for a type.

impl From<&[u8]> for Constant

fn from(value: &[u8]) -> Self

Converts to this type from the input type.

impl From<&str> for Constant

fn from(value: &str) -> Self

Converts to this type from the input type.

impl From<()> for Constant

fn from(value: ()) -> Self

Converts to this type from the input type.

impl From<ArcSlice<[u8]>> for Constant

fn from(value: BytesValue) -> Self

Converts to this type from the input type.

impl From<ArcSlice<str>> for Constant

fn from(value: StringValue) -> Self

Converts to this type from the input type.

impl From<Box<[u8]>> for Constant

fn from(value: Box<[u8]>) -> Self

Converts to this type from the input type.

impl From<Box<str>> for Constant

fn from(value: Box<str>) -> Self

Converts to this type from the input type.

impl From<DateTime<Utc>> for Constant

fn from(value: Timestamp) -> Self

Converts to this type from the input type.

impl From<String> for Constant

fn from(value: String) -> Self

Converts to this type from the input type.

impl From<SystemTime> for Constant

fn from(value: SystemTime) -> Self

Converts to this type from the input type.

impl From<TimeDelta> for Constant

fn from(value: Duration) -> Self

Converts to this type from the input type.

impl From<Vec<u8>> for Constant

fn from(value: Vec<u8>) -> Self

Converts to this type from the input type.

impl From<bool> for Constant

fn from(value: bool) -> Self

Converts to this type from the input type.

impl From<f32> for Constant

fn from(value: f32) -> Self

Converts to this type from the input type.

impl From<f64> for Constant

fn from(value: f64) -> Self

Converts to this type from the input type.

impl From<i16> for Constant

fn from(value: i16) -> Self

Converts to this type from the input type.

impl From<i32> for Constant

fn from(value: i32) -> Self

Converts to this type from the input type.

impl From<i64> for Constant

fn from(value: i64) -> Self

Converts to this type from the input type.

impl From<isize> for Constant

fn from(value: isize) -> Self

Converts to this type from the input type.

impl From<u16> for Constant

fn from(value: u16) -> Self

Converts to this type from the input type.

impl From<u32> for Constant

fn from(value: u32) -> Self

Converts to this type from the input type.

impl From<u64> for Constant

fn from(value: u64) -> Self

Converts to this type from the input type.

impl From<usize> for Constant

fn from(value: usize) -> Self

Converts to this type from the input type.

impl PartialEq for Constant

fn eq(&self, other: &Constant) -> 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<Value> for Constant

type Error = FromValueError

The type returned in the event of a conversion error.

fn try_from(value: Value) -> Result<Self, Self::Error>

Performs the conversion.

impl StructuralPartialEq for Constant