Enum SortKeySource 

pub enum SortKeySource {
    Sync(Arc<dyn Fn(&Value) -> Result<SortKey, CamelError> + Send + Sync>),
    Async(Arc<dyn Fn(&Value) -> BoxValueFuture + Send + Sync>),
}

Extracts a sort key from each element of the body array.

The sync arm keeps the historical contract (the closure decides what is a valid key). The async arm rejects non-scalar results: Array/Object keys are a user error.

Variants

Sync(Arc<dyn Fn(&Value) -> Result<SortKey, CamelError> + Send + Sync>)

Programmatic synchronous key extractor.

Async(Arc<dyn Fn(&Value) -> BoxValueFuture + Send + Sync>)

Language-backed asynchronous expression.

Implementations

impl SortKeySource

pub async fn key(&self, value: &Value) -> Result<SortKey, CamelError>

Extract the sort key for value, propagating failures.

Trait Implementations

impl Clone for SortKeySource

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.