# Struct RangeFull

1.6.0 · Source

    pub struct RangeFull;

Expand description

An unbounded range (`..`).

`RangeFull` is primarily used as a slicing index, its shorthand is `..`. It cannot serve as an `Iterator` because it doesn’t have a starting point.

## §Examples

The `..` syntax is a `RangeFull`:

    assert_eq!(.., std::ops::RangeFull);

It does not have an `IntoIterator` implementation, so you can’t use it in a `for` loop directly. This won’t compile:

ⓘ

    for i in .. {
        // ...
    }

Used as a slicing index, `RangeFull` produces the full array as a slice.

    let arr = [0, 1, 2, 3, 4];
    assert_eq!(arr[ ..  ], [0, 1, 2, 3, 4]); // This is the `RangeFull`
    assert_eq!(arr[ .. 3], [0, 1, 2      ]);
    assert_eq!(arr[ ..=3], [0, 1, 2, 3   ]);
    assert_eq!(arr[1..  ], [   1, 2, 3, 4]);
    assert_eq!(arr[1.. 3], [   1, 2      ]);
    assert_eq!(arr[1..=3], [   1, 2, 3   ]);

## Trait Implementations§

1.0.0 · Source§

### impl Clone for RangeFull

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#### fn clone(&self) -> RangeFull

Returns a duplicate of the value. Read more
1.0.0 · Source§

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

Performs copy-assignment from `source`. Read more
1.0.0 · Source§

### impl Debug for RangeFull

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

Formats the value using the given formatter. Read more
1.0.0 · Source§

### impl Default for RangeFull

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#### fn default() -> RangeFull

Returns the “default value” for a type. Read more
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### impl Distribution<bool> for RangeFull

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#### fn sample(&self, source: &mut (impl RandomSource + ?Sized)) -> bool

🔬This is a nightly-only experimental API. (`random` #130703)
Samples a random value from the distribution, using the specified random source.
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### impl Distribution<i128> for RangeFull

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#### fn sample(&self, source: &mut (impl RandomSource + ?Sized)) -> i128

🔬This is a nightly-only experimental API. (`random` #130703)
Samples a random value from the distribution, using the specified random source.
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### impl Distribution<i16> for RangeFull

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#### fn sample(&self, source: &mut (impl RandomSource + ?Sized)) -> i16

🔬This is a nightly-only experimental API. (`random` #130703)
Samples a random value from the distribution, using the specified random source.
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### impl Distribution<i32> for RangeFull

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#### fn sample(&self, source: &mut (impl RandomSource + ?Sized)) -> i32

🔬This is a nightly-only experimental API. (`random` #130703)
Samples a random value from the distribution, using the specified random source.
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### impl Distribution<i64> for RangeFull

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#### fn sample(&self, source: &mut (impl RandomSource + ?Sized)) -> i64

🔬This is a nightly-only experimental API. (`random` #130703)
Samples a random value from the distribution, using the specified random source.
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### impl Distribution<i8> for RangeFull

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#### fn sample(&self, source: &mut (impl RandomSource + ?Sized)) -> i8

🔬This is a nightly-only experimental API. (`random` #130703)
Samples a random value from the distribution, using the specified random source.
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### impl Distribution<isize> for RangeFull

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#### fn sample(&self, source: &mut (impl RandomSource + ?Sized)) -> isize

🔬This is a nightly-only experimental API. (`random` #130703)
Samples a random value from the distribution, using the specified random source.
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### impl Distribution<u128> for RangeFull

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#### fn sample(&self, source: &mut (impl RandomSource + ?Sized)) -> u128

🔬This is a nightly-only experimental API. (`random` #130703)
Samples a random value from the distribution, using the specified random source.
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### impl Distribution<u16> for RangeFull

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#### fn sample(&self, source: &mut (impl RandomSource + ?Sized)) -> u16

🔬This is a nightly-only experimental API. (`random` #130703)
Samples a random value from the distribution, using the specified random source.
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### impl Distribution<u32> for RangeFull

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#### fn sample(&self, source: &mut (impl RandomSource + ?Sized)) -> u32

🔬This is a nightly-only experimental API. (`random` #130703)
Samples a random value from the distribution, using the specified random source.
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### impl Distribution<u64> for RangeFull

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#### fn sample(&self, source: &mut (impl RandomSource + ?Sized)) -> u64

🔬This is a nightly-only experimental API. (`random` #130703)
Samples a random value from the distribution, using the specified random source.
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### impl Distribution<u8> for RangeFull

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#### fn sample(&self, source: &mut (impl RandomSource + ?Sized)) -> u8

🔬This is a nightly-only experimental API. (`random` #130703)
Samples a random value from the distribution, using the specified random source.
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### impl Distribution<usize> for RangeFull

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#### fn sample(&self, source: &mut (impl RandomSource + ?Sized)) -> usize

🔬This is a nightly-only experimental API. (`random` #130703)
Samples a random value from the distribution, using the specified random source.
1.0.0 · Source§

### impl Hash for RangeFull

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

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

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

Feeds a slice of this type into the given `Hasher`. Read more
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### impl<T> IntoBounds<T> for RangeFull

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#### fn into_bounds(self) -> (Bound<T>, Bound<T>)

🔬This is a nightly-only experimental API. (`range_into_bounds` #136903)
Convert this range into the start and end bounds. Returns `(start_bound, end_bound)`. Read more
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#### fn intersect<R>(self, other: R) -> (Bound<T>, Bound<T>)
where Self: Sized, T: Ord, R: Sized + IntoBounds<T>,

🔬This is a nightly-only experimental API. (`range_into_bounds` #136903)
Compute the intersection of `self` and `other`. Read more
1.0.0 · Source§

### impl PartialEq for RangeFull

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#### fn eq(&self, other: &RangeFull) -> 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.
1.28.0 · Source§

### impl<T: ?Sized> RangeBounds<T> for RangeFull

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#### fn start_bound(&self) -> Bound<&T>

Start index bound. Read more
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#### fn end_bound(&self) -> Bound<&T>

End index bound. Read more
1.35.0 · Source§

#### fn contains<U>(&self, item: &U) -> bool
where T: PartialOrd<U>, U: ?Sized + PartialOrd<T>,

Returns `true` if `item` is contained in the range. Read more
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#### fn is_empty(&self) -> bool
where T: PartialOrd,

🔬This is a nightly-only experimental API. (`range_bounds_is_empty` #137300)
Returns `true` if the range contains no items. One-sided ranges (`RangeFrom`, etc) always return `false`. Read more
1.15.0 (const: unstable) · Source§

### impl<T> SliceIndex<[T]> for RangeFull

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#### type Output = [T]

The output type returned by methods.
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#### fn get(self, slice: &[T]) -> Option<&[T]>

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a shared reference to the output at this location, if in bounds.
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#### fn get_mut(self, slice: &mut [T]) -> Option<&mut [T]>

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a mutable reference to the output at this location, if in bounds.
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#### unsafe fn get_unchecked(self, slice: *const [T]) -> *const [T]

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a pointer to the output at this location, without performing any bounds checking. Read more
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#### unsafe fn get_unchecked_mut(self, slice: *mut [T]) -> *mut [T]

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a mutable pointer to the output at this location, without performing any bounds checking. Read more
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#### fn index(self, slice: &[T]) -> &[T]

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a shared reference to the output at this location, panicking if out of bounds.
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#### fn index_mut(self, slice: &mut [T]) -> &mut [T]

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a mutable reference to the output at this location, panicking if out of bounds.
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### impl SliceIndex<ByteStr> for RangeFull

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#### type Output = ByteStr

The output type returned by methods.
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#### fn get(self, slice: &ByteStr) -> Option<&Self::Output>

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a shared reference to the output at this location, if in bounds.
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#### fn get_mut(self, slice: &mut ByteStr) -> Option<&mut Self::Output>

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a mutable reference to the output at this location, if in bounds.
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#### unsafe fn get_unchecked(self, slice: *const ByteStr) -> *const Self::Output

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a pointer to the output at this location, without performing any bounds checking. Read more
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#### unsafe fn get_unchecked_mut(self, slice: *mut ByteStr) -> *mut Self::Output

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a mutable pointer to the output at this location, without performing any bounds checking. Read more
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#### fn index(self, slice: &ByteStr) -> &Self::Output

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a shared reference to the output at this location, panicking if out of bounds.
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#### fn index_mut(self, slice: &mut ByteStr) -> &mut Self::Output

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a mutable reference to the output at this location, panicking if out of bounds.
1.20.0 (const: unstable) · Source§

### impl SliceIndex<str> for RangeFull

Implements substring slicing with syntax `&self[..]` or `&mut self[..]`.

Returns a slice of the whole string, i.e., returns `&self` or `&mut self`. Equivalent to `&self[0 .. len]` or `&mut self[0 .. len]`. Unlike other indexing operations, this can never panic.

This operation is O(1).

Prior to 1.20.0, these indexing operations were still supported by direct implementation of `Index` and `IndexMut`.

Equivalent to `&self[0 .. len]` or `&mut self[0 .. len]`.

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#### type Output = str

The output type returned by methods.
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#### fn get(self, slice: &str) -> Option<&Self::Output>

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a shared reference to the output at this location, if in bounds.
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#### fn get_mut(self, slice: &mut str) -> Option<&mut Self::Output>

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a mutable reference to the output at this location, if in bounds.
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#### unsafe fn get_unchecked(self, slice: *const str) -> *const Self::Output

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a pointer to the output at this location, without performing any bounds checking. Read more
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#### unsafe fn get_unchecked_mut(self, slice: *mut str) -> *mut Self::Output

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a mutable pointer to the output at this location, without performing any bounds checking. Read more
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#### fn index(self, slice: &str) -> &Self::Output

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a shared reference to the output at this location, panicking if out of bounds.
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#### fn index_mut(self, slice: &mut str) -> &mut Self::Output

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a mutable reference to the output at this location, panicking if out of bounds.
1.0.0 · Source§

### impl Copy for RangeFull

1.0.0 · Source§

### impl Eq for RangeFull

1.0.0 · Source§

### impl StructuralPartialEq for RangeFull

## Auto Trait Implementations§

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### impl Freeze for RangeFull

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### impl RefUnwindSafe for RangeFull

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### impl Send for RangeFull

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### impl Sync for RangeFull

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### impl Unpin for RangeFull

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### impl UnwindSafe for RangeFull

## Blanket Implementations§

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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<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` #126799)
Performs copy-assignment from `self` to `dest`. Read more
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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, 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, 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.