Trait KeyExtractor 

pub trait KeyExtractor<'a, T> {
    type Key: Hash;

    // Required method
    fn extract(&self, from: &'a T) -> Self::Key;
}

Extracts the key from the value, allowing KeyedSet to obtain its values’ keys.

Required Associated Types

type Key: Hash

The type of the key extracted by the extractor.

Required Methods

fn extract(&self, from: &'a T) -> Self::Key

Extracts the key from the value, allowing KeyedSet to obtain its values’ keys.

Dyn Compatibility

This trait is dyn compatible.

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

Implementations on Foreign Types

impl<'a, T: 'a + Hash> KeyExtractor<'a, T> for ()

type Key = &'a T

fn extract(&self, from: &'a T) -> Self::Key

Implementors

impl<'a, T: 'a, U: Hash, F: Fn(&'a T) -> U> KeyExtractor<'a, T> for F

type Key = U