Struct RandomReplacement 

pub struct RandomReplacement<R = StdRng> { /* private fields */ }

Choose a random cache entry to replace.

When considering n items to potentially replace, choose one at random.

Requires the "rand" feature to be enabled.

Implementations

impl<R> RandomReplacement<R>

pub fn with_rng(rng: R) -> Self

Construct a RandomReplacement with the given random number generator.

Example

use associative_cache::*;
use rand::{rngs::StdRng, SeedableRng};

let rng = StdRng::seed_from_u64(42);
let policy = RandomReplacement::with_rng(rng);

Trait Implementations

impl<R: Clone> Clone for RandomReplacement<R>

fn clone(&self) -> RandomReplacement<R>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<R: Debug> Debug for RandomReplacement<R>

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

Formats the value using the given formatter.

impl Default for RandomReplacement<StdRng>

Available on crate feature rand only.

fn default() -> Self

Returns the “default value” for a type.

impl<R: Hash> Hash for RandomReplacement<R>

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<R: Ord> Ord for RandomReplacement<R>

fn cmp(&self, other: &RandomReplacement<R>) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl<R: PartialEq> PartialEq for RandomReplacement<R>

fn eq(&self, other: &RandomReplacement<R>) -> 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<R: PartialOrd> PartialOrd for RandomReplacement<R>

fn partial_cmp(&self, other: &RandomReplacement<R>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<V, C, R> Replacement<V, C> for RandomReplacement<R>

where C: Capacity, R: Rng,

Available on crate feature rand only.

fn choose_for_replacement<'a>( &mut self, candidates: impl Iterator<Item = (usize, &'a V)>, ) -> usize

where V: 'a,

Choose which of the given cache entries will be replaced.

fn on_hit(&self, value: &V)

Called whenever an existing cache entry is hit.

fn on_insert(&self, value: &V)

Called whenever a new cache entry is inserted.

impl<R: Eq> Eq for RandomReplacement<R>

impl<R> StructuralPartialEq for RandomReplacement<R>