1.7.0[−][src]Struct std::hash::BuildHasherDefault
Used to create a default BuildHasher
instance for types that implement
Hasher
and Default
.
BuildHasherDefault<H>
can be used when a type H
implements Hasher
and
Default
, and you need a corresponding BuildHasher
instance, but none is
defined.
Any BuildHasherDefault
is zero-sized. It can be created with
default
. When using BuildHasherDefault
with HashMap
or
HashSet
, this doesn't need to be done, since they implement appropriate
Default
instances themselves.
Examples
Using BuildHasherDefault
to specify a custom BuildHasher
for
HashMap
:
use std::collections::HashMap; use std::hash::{BuildHasherDefault, Hasher}; #[derive(Default)] struct MyHasher; impl Hasher for MyHasher { fn write(&mut self, bytes: &[u8]) { // Your hashing algorithm goes here! unimplemented!() } fn finish(&self) -> u64 { // Your hashing algorithm goes here! unimplemented!() } } type MyBuildHasher = BuildHasherDefault<MyHasher>; let hash_map = HashMap::<u32, u32, MyBuildHasher>::default();Run
Trait Implementations
impl<H> Debug for BuildHasherDefault<H>
1.9.0[src]
impl<H> Eq for BuildHasherDefault<H>
1.29.0[src]
impl<H> Clone for BuildHasherDefault<H>
[src]
fn clone(&self) -> BuildHasherDefault<H>
[src]
fn clone_from(&mut self, source: &Self)
1.0.0[src]
impl<H> PartialEq<BuildHasherDefault<H>> for BuildHasherDefault<H>
1.29.0[src]
fn eq(&self, _other: &BuildHasherDefault<H>) -> bool
[src]
#[must_use]
fn ne(&self, other: &Rhs) -> bool
1.0.0[src]
impl<H> Default for BuildHasherDefault<H>
[src]
fn default() -> BuildHasherDefault<H>
[src]
impl<H> BuildHasher for BuildHasherDefault<H> where
H: Default + Hasher,
[src]
H: Default + Hasher,
Auto Trait Implementations
impl<H> UnwindSafe for BuildHasherDefault<H> where
H: UnwindSafe,
H: UnwindSafe,
impl<H> RefUnwindSafe for BuildHasherDefault<H> where
H: RefUnwindSafe,
H: RefUnwindSafe,
impl<H> Unpin for BuildHasherDefault<H> where
H: Unpin,
H: Unpin,
impl<H> Send for BuildHasherDefault<H> where
H: Send,
H: Send,
impl<H> Sync for BuildHasherDefault<H> where
H: Sync,
H: Sync,
Blanket Implementations
impl<T> From<T> for T
[src]
impl<T, U> TryFrom<U> for T where
U: Into<T>,
[src]
U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
[src]
impl<T, U> Into<U> for T where
U: From<T>,
[src]
U: From<T>,
impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
[src]
U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
[src]
impl<T> Borrow<T> for T where
T: ?Sized,
[src]
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
[src]
T: ?Sized,
ⓘImportant traits for &'_ mut Ffn borrow_mut(&mut self) -> &mut T
[src]
ⓘImportant traits for &'_ mut F
impl<T> Any for T where
T: 'static + ?Sized,
[src]
T: 'static + ?Sized,
impl<T> ToOwned for T where
T: Clone,
[src]
T: Clone,