Enum Bound

1.17.0 · Source
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());

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§1.17.0

Included(T)

An inclusive bound.

§1.17.0

Excluded(T)

An exclusive bound.

§1.17.0

Unbounded

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

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impl<T> Bound<T>

1.65.0 · Source

pub fn as_ref(&self) -> Bound<&T>

Converts from &Bound<T> to Bound<&T>.

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pub fn as_mut(&mut self) -> Bound<&mut T>

🔬This is a nightly-only experimental API. (bound_as_ref)

Converts from &mut Bound<T> to Bound<&mut T>.

1.77.0 · Source

pub fn map<U, F>(self, f: F) -> Bound<U>
where F: FnOnce(T) -> U,

Maps a Bound<T> to a Bound<U> by applying a function to the contained value (including both Included and Excluded), returning a Bound of the same kind.

§Examples
use std::ops::Bound::*;

let bound_string = Included("Hello, World!");

assert_eq!(bound_string.map(|s| s.len()), Included(13));
use std::ops::Bound;
use Bound::*;

let unbounded_string: Bound<String> = Unbounded;

assert_eq!(unbounded_string.map(|s| s.len()), Unbounded);
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impl<T> Bound<&T>
where T: Clone,

1.55.0 · Source

pub fn cloned(self) -> Bound<T>

Map a Bound<&T> to a Bound<T> by cloning the contents of the bound.

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

assert_eq!((1..12).start_bound(), Included(&1));
assert_eq!((1..12).start_bound().cloned(), Included(1));

Trait Implementations§

1.17.0 · Source§

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

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

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
1.17.0 · Source§

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

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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<'de, T> Deserialize<'de> for Bound<T>
where T: Deserialize<'de>,

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fn deserialize<D>( deserializer: D, ) -> Result<Bound<T>, <D as Deserializer<'de>>::Error>
where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl<'de, T, U> DeserializeAs<'de, Bound<T>> for Bound<U>
where U: DeserializeAs<'de, T>,

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fn deserialize_as<D>( deserializer: D, ) -> Result<Bound<T>, <D as Deserializer<'de>>::Error>
where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.
1.17.0 · Source§

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

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

Feeds this value into the given Hasher. Read more
1.3.0 · Source§

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

Feeds a slice of this type into the given Hasher. Read more
1.17.0 · Source§

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

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

Tests for self and other values to be equal, and is used by ==.
1.0.0 · Source§

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<T> Serialize for Bound<T>
where T: Serialize,

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fn serialize<S>( &self, serializer: S, ) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>
where S: Serializer,

Serialize this value into the given Serde serializer. Read more
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impl<T, U> SerializeAs<Bound<T>> for Bound<U>
where U: SerializeAs<T>,

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fn serialize_as<S>( source: &Bound<T>, serializer: S, ) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>
where S: Serializer,

Serialize this value into the given Serde serializer.
1.17.0 · Source§

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

1.17.0 · Source§

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

1.17.0 · Source§

impl<T> StructuralPartialEq for Bound<T>

Auto Trait Implementations§

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

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

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

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

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

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

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<S> AssignWithType for S

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fn assign_with_type<T, IntoT>(&mut self, component: IntoT)
where IntoT: Into<T>, S: Assign<T, IntoT>,

Sets the value of a component by its type. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<C, E> EntryToVal<C> for E
where C: Collection<Entry = E>,

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type Val = <C as Collection>::Val

The type of values stored in the collection. This might be distinct from Entry in complex collections. For example, in a HashMap, while Entry might be a ( key, value ) tuple, Val might only be the value part.
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fn entry_to_val(self) -> <E as EntryToVal<C>>::Val

Converts an entry into a value representation specific to the type of collection. This conversion is crucial for handling operations on entries, especially when they need to be treated or accessed as individual values, such as retrieving the value part from a key-value pair in a hash map.
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<T> PolicyExt for T
where T: ?Sized,

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fn and<P, B, E>(self, other: P) -> And<T, P>
where T: Policy<B, E>, P: Policy<B, E>,

Create a new Policy that returns Action::Follow only if self and other return Action::Follow. Read more
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fn or<P, B, E>(self, other: P) -> Or<T, P>
where T: Policy<B, E>, P: Policy<B, E>,

Create a new Policy that returns Action::Follow if either self or other returns Action::Follow. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<'a, T> ToStringWith<WithDebug> for T
where T: Debug + ?Sized,

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fn to_string_with<'s>(&'s self) -> Cow<'s, str>

Converts the type to a string using Debug formatting.

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impl<'a, T> ToStringWith<WithDebugMultiline> for T
where T: Debug + ?Sized,

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fn to_string_with<'s>(&'s self) -> Cow<'s, str>

Converts the type to a string using Debug formatting.

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impl<Initial, Error, Final> TransitiveTryFrom<Error, Initial> for Final

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fn transitive_try_from<Transitive>(src: Initial) -> Result<Self, Error>
where Transitive: TryFrom<Initial>, Self: TryFrom<Transitive, Error = Error>, Error: From<<Transitive as TryFrom<Initial>>::Error>,

Performs a transitive try_from conversion. Read more
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impl<Error, Final, Initial> TransitiveTryInto<Error, Final> for Initial

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fn transitive_try_into<Transitive>(self) -> Result<Final, Error>
where Self: TryInto<Transitive>, Transitive: TryInto<Final, Error = Error>, Error: From<Self::Error>,

Performs a transitive try_into conversion. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> TypeName for T
where T: ?Sized,

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fn type_name(&self) -> &'static str

Return name of type of variable.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<C, Val> ValToEntry<C> for Val
where C: CollectionValToEntry<Val>,

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fn val_to_entry(self) -> <C as CollectionValToEntry<Val>>::Entry

Invokes the val_to_entry function of the CollectionValToEntry trait to convert the value to an entry.

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type Entry = <C as CollectionValToEntry<Val>>::Entry

Represents the type of entry that corresponds to the value within the collection.
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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<T> CellRepr for T
where T: Copy + 'static,

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impl<T> DeserializeOwned for T
where T: for<'de> Deserialize<'de>,

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impl<T> ErasedDestructor for T
where T: 'static,

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impl<T> RowKey for T
where T: ?Sized,