Struct Hashed 

pub struct Hashed<V, S = FixedHasher> { /* private fields */ }

A pre-hashed value of a specific type. Pre-hashing enables memoization of hashes that are expensive to compute.

It also enables faster PartialEq comparisons by short circuiting on hash equality. See PassHash and PassHasher for a “pass through” BuildHasher and Hasher implementation designed to work with Hashed See PreHashMap for a hashmap pre-configured to use Hashed keys.

Implementations

impl<V, H> Hashed<V, H>

where V: Hash, H: BuildHasher + Default,

pub fn new(value: V) -> Hashed<V, H>

Pre-hashes the given value using the BuildHasher configured in the Hashed type.

pub fn mutate(&mut self, func: impl FnOnce(&mut V))

Mutates the current value and re-computes the hash.

pub fn hash(&self) -> u64

The pre-computed hash.

Trait Implementations

impl<V, H> Clone for Hashed<V, H>

where V: Clone,

fn clone(&self) -> Hashed<V, H>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<V, H> Copy for Hashed<V, H>

where V: Copy,

impl<V, H> Debug for Hashed<V, H>

where V: Debug,

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

Formats the value using the given formatter.

impl<V, H> Deref for Hashed<V, H>

type Target = V

The resulting type after dereferencing.

fn deref(&self) -> &<Hashed<V, H> as Deref>::Target

Dereferences the value.

impl<V, H> Eq for Hashed<V, H>

where V: Eq,

impl Equivalent<Hashed<InnerSceneEntityReference>> for SceneEntityReference

fn equivalent(&self, key: &Hashed<InnerSceneEntityReference>) -> bool

Compare self to key and return true if they are equal.

impl<V, H> From<V> for Hashed<V, H>

where V: Hash, H: BuildHasher + Default,

fn from(value: V) -> Hashed<V, H>

Converts to this type from the input type.

impl<T, H> FromReflect for Hashed<T, H>

where T: Clone + Send + Sync + TypePath, H: Send + Sync + TypePath, Hashed<T, H>: Any + Send + Sync,

fn from_reflect( reflect: &(dyn PartialReflect + 'static), ) -> Option<Hashed<T, H>>

Constructs a concrete instance of Self from a reflected value.

fn take_from_reflect( reflect: Box<dyn PartialReflect>, ) -> Result<Self, Box<dyn PartialReflect>>

Attempts to downcast the given value to Self using, constructing the value using from_reflect if that fails.

impl<T, H> GetTypeRegistration for Hashed<T, H>

where T: Clone + Send + Sync + TypePath, H: Send + Sync + TypePath, Hashed<T, H>: Any + Send + Sync,

fn get_type_registration() -> TypeRegistration

Returns the default TypeRegistration for this type.

fn register_type_dependencies(_registry: &mut TypeRegistry)

Registers other types needed by this type.

impl<V, H> Hash for Hashed<V, H>

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

where R: Hasher,

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<V, H> PartialEq for Hashed<V, H>

where V: PartialEq,

fn eq(&self, other: &Hashed<V, H>) -> bool

A fast impl of PartialEq that first checks that other’s pre-computed hash matches this value’s pre-computed hash.

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<T, H> PartialReflect for Hashed<T, H>

where T: Clone + Send + Sync + TypePath, H: Send + Sync + TypePath, Hashed<T, H>: Any + Send + Sync,

fn get_represented_type_info(&self) -> Option<&'static TypeInfo>

Returns the TypeInfo of the type represented by this value.

fn to_dynamic(&self) -> Box<dyn PartialReflect>

Converts this reflected value into its dynamic representation based on its kind.

fn try_apply( &mut self, value: &(dyn PartialReflect + 'static), ) -> Result<(), ApplyError>

Tries to apply a reflected value to this value.

fn reflect_kind(&self) -> ReflectKind

Returns a zero-sized enumeration of “kinds” of type.

fn reflect_ref(&self) -> ReflectRef<'_>

Returns an immutable enumeration of “kinds” of type.

fn reflect_mut(&mut self) -> ReflectMut<'_>

Returns a mutable enumeration of “kinds” of type.

fn reflect_owned(self: Box<Hashed<T, H>>) -> ReflectOwned

Returns an owned enumeration of “kinds” of type.

fn try_into_reflect( self: Box<Hashed<T, H>>, ) -> Result<Box<dyn Reflect>, Box<dyn PartialReflect>>

Attempts to cast this type to a boxed, fully-reflected value.

fn try_as_reflect(&self) -> Option<&(dyn Reflect + 'static)>

Attempts to cast this type to a fully-reflected value.

fn try_as_reflect_mut(&mut self) -> Option<&mut (dyn Reflect + 'static)>

Attempts to cast this type to a mutable, fully-reflected value.

fn into_partial_reflect(self: Box<Hashed<T, H>>) -> Box<dyn PartialReflect>

Casts this type to a boxed, reflected value.

fn as_partial_reflect(&self) -> &(dyn PartialReflect + 'static)

Casts this type to a reflected value.

fn as_partial_reflect_mut(&mut self) -> &mut (dyn PartialReflect + 'static)

Casts this type to a mutable, reflected value.

fn apply(&mut self, value: &(dyn PartialReflect + 'static))

Applies a reflected value to this value.

fn reflect_clone(&self) -> Result<Box<dyn Reflect>, ReflectCloneError>

Attempts to clone Self using reflection.

fn reflect_clone_and_take<T>(&self) -> Result<T, ReflectCloneError>

where T: 'static, Self: Sized + TypePath,

For a type implementing PartialReflect, combines reflect_clone and take in a useful fashion, automatically constructing an appropriate ReflectCloneError if the downcast fails.

fn reflect_hash(&self) -> Option<u64>

Returns a hash of the value (which includes the type).

fn reflect_partial_eq( &self, _value: &(dyn PartialReflect + 'static), ) -> Option<bool>

Returns a “partial equality” comparison result.

fn reflect_partial_cmp( &self, _value: &(dyn PartialReflect + 'static), ) -> Option<Ordering>

Returns a “partial comparison” result.

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

Debug formatter for the value.

fn is_dynamic(&self) -> bool

Indicates whether or not this type is a dynamic type.

impl<T, H> Reflect for Hashed<T, H>

where T: Clone + Send + Sync + TypePath, H: Send + Sync + TypePath, Hashed<T, H>: Any + Send + Sync,

fn into_any(self: Box<Hashed<T, H>>) -> Box<dyn Any>

Returns the value as a Box<dyn Any>.

fn as_any(&self) -> &(dyn Any + 'static)

Returns the value as a &dyn Any.

fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Returns the value as a &mut dyn Any.

fn into_reflect(self: Box<Hashed<T, H>>) -> Box<dyn Reflect>

Casts this type to a boxed, fully-reflected value.

fn as_reflect(&self) -> &(dyn Reflect + 'static)

Casts this type to a fully-reflected value.

fn as_reflect_mut(&mut self) -> &mut (dyn Reflect + 'static)

Casts this type to a mutable, fully-reflected value.

fn set(&mut self, value: Box<dyn Reflect>) -> Result<(), Box<dyn Reflect>>

Performs a type-checked assignment of a reflected value to this value.

impl<T, H> TypePath for Hashed<T, H>

where T: Clone + Send + Sync + TypePath, H: Send + Sync + TypePath, Hashed<T, H>: Any + Send + Sync,

fn type_path() -> &'static str

Returns the fully qualified path of the underlying type.

fn short_type_path() -> &'static str

Returns a short, pretty-print enabled path to the type.

fn type_ident() -> Option<&'static str>

Returns the name of the type, or None if it is anonymous.

fn crate_name() -> Option<&'static str>

Returns the name of the crate the type is in, or None if it is anonymous.

fn module_path() -> Option<&'static str>

Returns the path to the module the type is in, or None if it is anonymous.

impl<T, H> Typed for Hashed<T, H>

where T: Clone + Send + Sync + TypePath, H: Send + Sync + TypePath, Hashed<T, H>: Any + Send + Sync,

fn type_info() -> &'static TypeInfo

Returns the compile-time info for the underlying type.