Struct rustc_data_structures::intern::WithStableHash

pub struct WithStableHash<T> {
    pub internee: T,
    pub stable_hash: Fingerprint,
}

A helper type that you can wrap round your own type in order to automatically cache the stable hash on creation and not recompute it whenever the stable hash of the type is computed. This is only done in incremental mode. You can also opt out of caching by using StableHash::ZERO for the hash, in which case the hash gets computed each time. This is useful if you have values that you intern but never (can?) use for stable hashing.

Fields

internee: T

stable_hash: Fingerprint

Trait Implementations

impl<T: Clone> Clone for WithStableHash<T>

fn clone(&self) -> WithStableHash<T>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T> Deref for WithStableHash<T>

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &T

Dereferences the value.

impl<T: Hash> Hash for WithStableHash<T>

fn hash<H: Hasher>(&self, s: &mut H)

Feeds this value into the given Hasher.

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

Feeds a slice of this type into the given Hasher.

impl<T: HashStable<CTX>, CTX: InternedHashingContext> HashStable<CTX> for WithStableHash<T>

fn hash_stable(&self, hcx: &mut CTX, hasher: &mut StableHasher)

impl<T: Ord> Ord for WithStableHash<T>

fn cmp(&self, other: &WithStableHash<T>) -> Ordering

This method returns an Ordering between self and other.

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

Compares and returns the maximum of two values.

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

Compares and returns the minimum of two values.

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

Restrict a value to a certain interval.

impl<T: PartialEq> PartialEq<WithStableHash<T>> for WithStableHash<T>

fn eq(&self, other: &Self) -> bool

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=.

impl<T: Ord> PartialOrd<WithStableHash<T>> for WithStableHash<T>

fn partial_cmp(&self, other: &WithStableHash<T>) -> Option<Ordering>

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

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

This method tests less than (for self and other) and is used by the < operator.

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

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

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

This method tests greater than (for self and other) and is used by the > operator.

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

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

impl<T: Copy> Copy for WithStableHash<T>

impl<T: Eq> Eq for WithStableHash<T>

Layout

Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.