# 1.17.0[−][src]Enum std::ops::Bound

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

An endpoint of a range of keys.

# Examples

`Bound`s 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));Run

Using a tuple of `Bound`s 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());Run

## Variants

`Included(T)`

An inclusive bound.

`Excluded(T)`

An exclusive bound.

`Unbounded`

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

## Methods

### `impl<'_, T> Bound<&'_ T> where
T: Clone,` [src]

#### `pub fn cloned(self) -> Bound<T>`[src]

🔬 This is a nightly-only experimental API. (`bound_cloned` #61356)

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

# Examples

    #![feature(bound_cloned)]
    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));Run

## Trait Implementations

### `impl<T> Debug for Bound<T> where
T: Debug,` [src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

Formats the value using the given formatter. Read more

### `impl<T> Clone for Bound<T> where
T: Clone,` [src]

#### `fn clone(&self) -> Bound<T>`[src]

Returns a copy of the value. Read more

#### `fn clone_from(&mut self, source: &Self)`1.0.0[src]

Performs copy-assignment from `source`. Read more

### `impl<T> StructuralPartialEq for Bound<T>`[src]

### `impl<T> Copy for Bound<T> where
T: Copy,` [src]

### `impl<T> Eq for Bound<T> where
T: Eq,` [src]

### `impl<T> PartialEq<Bound<T>> for Bound<T> where
T: PartialEq<T>,` [src]

#### `fn eq(&self, other: &Bound<T>) -> bool`[src]

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

#### `fn ne(&self, other: &Bound<T>) -> bool`[src]

This method tests for `!=`.

### `impl<T> Hash for Bound<T> where
T: Hash,` [src]

#### `fn hash<__H>(&self, state: &mut __H) where
__H: Hasher,` [src]

Feeds this value into the given [`Hasher`]. Read more

#### `fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,` 1.3.0[src]

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

### `impl<T> StructuralEq for Bound<T>`[src]

## Auto Trait Implementations

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

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

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

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

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

## Blanket Implementations

### `impl<T> From<T> for T`[src]

#### `fn from(t: T) -> T`[src]

Performs the conversion.

### `impl<T, U> TryFrom<U> for T where
U: Into<T>,` [src]

#### `type Error = !`

The type returned in the event of a conversion error.

#### `fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>`[src]

Performs the conversion.

### `impl<T, U> Into<U> for T where
U: From<T>,` [src]

#### `fn into(self) -> U`[src]

Performs the conversion.

### `impl<T, U> TryInto<U> for T where
U: TryFrom<T>,` [src]

#### `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]

Performs the conversion.

### `impl<T> Borrow<T> for T where
T: ?Sized,` [src]

####
ⓘImportant traits for &'_ mut I

### Important traits for &'_ mut I

`impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, R: Read + ?Sized> Read for &'_ mut Rimpl<'_, W: Write + ?Sized> Write for &'_ mut W`
`fn borrow(&self) -> &T`[src]

Immutably borrows from an owned value. Read more

### `impl<T> BorrowMut<T> for T where
T: ?Sized,` [src]

####
ⓘImportant traits for &'_ mut I

### Important traits for &'_ mut I

`impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, R: Read + ?Sized> Read for &'_ mut Rimpl<'_, W: Write + ?Sized> Write for &'_ mut W`
`fn borrow_mut(&mut self) -> &mut T`[src]

Mutably borrows from an owned value. Read more

### `impl<T> Any for T where
T: 'static + ?Sized,` [src]

#### `fn type_id(&self) -> TypeId`[src]

Gets the `TypeId` of `self`. Read more

### `impl<T> ToOwned for T where
T: Clone,` [src]

#### `type Owned = T`

The resulting type after obtaining ownership.

#### `fn to_owned(&self) -> T`[src]

Creates owned data from borrowed data, usually by cloning. Read more

#### `fn clone_into(&self, target: &mut T)`[src]

🔬 This is a nightly-only experimental API. (`toowned_clone_into` #41263)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more