Trait KeyExtract 

pub trait KeyExtract<S, A, K>: Send + Sync {
    // Required method
    fn extract(&self, s: &S, a: &A, idx: usize) -> K;
}

Required Methods

fn extract(&self, s: &S, a: &A, idx: usize) -> K

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl<S, A, K, F> KeyExtract<S, A, K> for F

where F: Fn(&S, &A, usize) -> K + Send + Sync,

impl<S, A, K, KA> KeyExtract<S, A, K> for EntityKeyAdapter<KA>

where KA: Fn(&A) -> K + Send + Sync,