Struct rocket::mtls::oid::asn1_rs::nom::lib::std::hash::BuildHasherDefault

1.7.0 · source ·
pub struct BuildHasherDefault<H>(/* private fields */);
Available on crate feature mtls only.
Expand description

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();

Trait Implementations§

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impl<H> BuildHasher for BuildHasherDefault<H>
where H: Default + Hasher,

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type Hasher = H

Type of the hasher that will be created.
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fn build_hasher(&self) -> H

Creates a new hasher. Read more
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impl<H> Clone for BuildHasherDefault<H>

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fn clone(&self) -> BuildHasherDefault<H>

Returns a copy of the value. Read more
1.0.0 · source§

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

Performs copy-assignment from source. Read more
1.9.0 · source§

impl<H> Debug for BuildHasherDefault<H>

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

Formats the value using the given formatter. Read more
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impl<H> Default for BuildHasherDefault<H>

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fn default() -> BuildHasherDefault<H>

Returns the “default value” for a type. Read more
1.29.0 · source§

impl<H> PartialEq for BuildHasherDefault<H>

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fn eq(&self, _other: &BuildHasherDefault<H>) -> bool

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

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

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.29.0 · source§

impl<H> Eq for BuildHasherDefault<H>

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