Trait FromMapKey

pub trait FromMapKey:
    FromValue
    + Eq
    + Hash
    + Ord
where
    for<'a> Self::Output<'a>: Eq + Hash + Ord,
{
    // Required method
    fn from_mapkey<'a>(
        key: &'a MapKey,
    ) -> Result<Self::Output<'a>, FromMapKeyError>;
}

Trait for converting CEL map keys into Rust types.

FromMapKey provides conversion from CEL MapKey instances to Rust types. This is the inverse operation of IntoMapKey.

Examples

use cel_cxx::{FromMapKey, MapKey};

// Convert map keys back to Rust types
let cel_key = MapKey::String("hello".to_string().into());
let rust_string = String::from_mapkey(&cel_key).unwrap();
assert_eq!(rust_string, "hello");

let cel_key = MapKey::Int(42);
let rust_int = i64::from_mapkey(&cel_key).unwrap();
assert_eq!(rust_int, 42);

Required Methods

fn from_mapkey<'a>(key: &'a MapKey) -> Result<Self::Output<'a>, FromMapKeyError>

Attempts to convert a CEL MapKey into this type.

Returns

• Ok(Self): Conversion successful
• Err(MapKey): Conversion failed, returns original map key

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.

Implementations on Foreign Types

impl FromMapKey for &bool

fn from_mapkey<'a>( mapkey: &'a MapKey, ) -> Result<<Self as FromValue>::Output<'a>, FromMapKeyError>

impl FromMapKey for &i64

fn from_mapkey<'a>( mapkey: &'a MapKey, ) -> Result<<Self as FromValue>::Output<'a>, FromMapKeyError>

impl FromMapKey for &str

fn from_mapkey<'a>( mapkey: &'a MapKey, ) -> Result<<Self as FromValue>::Output<'a>, FromMapKeyError>

impl FromMapKey for &u64

fn from_mapkey<'a>( mapkey: &'a MapKey, ) -> Result<<Self as FromValue>::Output<'a>, FromMapKeyError>

impl FromMapKey for &ArcStr

fn from_mapkey<'a>( mapkey: &'a MapKey, ) -> Result<<Self as FromValue>::Output<'a>, FromMapKeyError>

impl FromMapKey for bool

fn from_mapkey<'a>( mapkey: &'a MapKey, ) -> Result<<Self as FromValue>::Output<'a>, FromMapKeyError>

impl FromMapKey for i16

fn from_mapkey<'a>( mapkey: &'a MapKey, ) -> Result<<Self as FromValue>::Output<'a>, FromMapKeyError>

impl FromMapKey for i32

fn from_mapkey<'a>( mapkey: &'a MapKey, ) -> Result<<Self as FromValue>::Output<'a>, FromMapKeyError>

impl FromMapKey for i64

fn from_mapkey<'a>( mapkey: &'a MapKey, ) -> Result<<Self as FromValue>::Output<'a>, FromMapKeyError>

impl FromMapKey for isize

fn from_mapkey<'a>( mapkey: &'a MapKey, ) -> Result<<Self as FromValue>::Output<'a>, FromMapKeyError>

impl FromMapKey for u16

fn from_mapkey<'a>( mapkey: &'a MapKey, ) -> Result<<Self as FromValue>::Output<'a>, FromMapKeyError>

impl FromMapKey for u32

fn from_mapkey<'a>( mapkey: &'a MapKey, ) -> Result<<Self as FromValue>::Output<'a>, FromMapKeyError>

impl FromMapKey for u64

fn from_mapkey<'a>( mapkey: &'a MapKey, ) -> Result<<Self as FromValue>::Output<'a>, FromMapKeyError>

impl FromMapKey for usize

fn from_mapkey<'a>( mapkey: &'a MapKey, ) -> Result<<Self as FromValue>::Output<'a>, FromMapKeyError>

impl FromMapKey for Box<str>

fn from_mapkey<'a>( mapkey: &'a MapKey, ) -> Result<<Self as FromValue>::Output<'a>, FromMapKeyError>

impl FromMapKey for String

fn from_mapkey<'a>( mapkey: &'a MapKey, ) -> Result<<Self as FromValue>::Output<'a>, FromMapKeyError>

impl FromMapKey for ArcStr

fn from_mapkey<'a>( mapkey: &'a MapKey, ) -> Result<<Self as FromValue>::Output<'a>, FromMapKeyError>

Implementors