Enum std::ops::Bound

[+] Show declaration

pub enum Bound<T> {
    Included(T),
    Excluded(T),
    Unbounded,
}

[−] Expand description

An endpoint of a range of keys.

Examples

Bounds are range endpoints:

use std::ops::Bound::*;
use std::ops::RangeBounds;

assert_eq!((..100).start_bound(), Unbounded);
assert_eq!((1..12).start_bound(), Included(&1));
assert_eq!((1..12).end_bound(), Excluded(&12));

Using a tuple of Bounds as an argument to BTreeMap::range. Note that in most cases, it's better to use range syntax (1..5) instead.

use std::collections::BTreeMap;
use std::ops::Bound::{Excluded, Included, Unbounded};

let mut map = BTreeMap::new();
map.insert(3, "a");
map.insert(5, "b");
map.insert(8, "c");

for (key, value) in map.range((Excluded(3), Included(8))) {
    println!("{}: {}", key, value);
}

assert_eq!(Some((&3, &"a")), map.range((Unbounded, Included(5))).next());

Variants

Included(T)

[−] Expand description

An inclusive bound.

Excluded(T)

[−] Expand description

An exclusive bound.

Unbounded

[−] Expand description

An infinite endpoint. Indicates that there is no bound in this direction.

Trait Implementations

impl<T> Hash for Bound<T> where     T: Hash,

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

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Feeds this value into the given [Hasher].

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

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Feeds a slice of this type into the given [Hasher].

impl<T> Debug for Bound<T> where     T: Debug,

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

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Formats the value using the given formatter.

impl<T> Clone for Bound<T> where     T: Clone,

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

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Returns a copy of the value.

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

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Performs copy-assignment from source.

impl<T> Eq for Bound<T> where     T: Eq,

impl<T> PartialEq<Bound<T>> for Bound<T> where     T: PartialEq<T>,

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fn eq(&self, other: &Bound<T>) -> bool

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

fn ne(&self, other: &Bound<T>) -> bool

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This method tests for !=.

impl<T> Copy for Bound<T> where     T: Copy,