# Primitive Type tuple

1.0.0 ·
Expand description

A finite heterogeneous sequence, `(T, U, ..)`.

Let’s cover each of those in turn:

Tuples are finite. In other words, a tuple has a length. Here’s a tuple of length `3`:

    ("hello", 5, 'c');

Run

‘Length’ is also sometimes called ‘arity’ here; each tuple of a different length is a different, distinct type.

Tuples are heterogeneous. This means that each element of the tuple can have a different type. In that tuple above, it has the type:

    (&'static str, i32, char)

Run

Tuples are a sequence. This means that they can be accessed by position; this is called ‘tuple indexing’, and it looks like this:

    let tuple = ("hello", 5, 'c');

    assert_eq!(tuple.0, "hello");
    assert_eq!(tuple.1, 5);
    assert_eq!(tuple.2, 'c');

Run

The sequential nature of the tuple applies to its implementations of various traits. For example, in `PartialOrd` and `Ord`, the elements are compared sequentially until the first non-equal set is found.

For more about tuples, see the book.

## Trait implementations

In this documentation the shorthand `(T₁, T₂, …, Tₙ)` is used to represent tuples of varying length. When that is used, any trait bound expressed on `T` applies to each element of the tuple independently. Note that this is a convenience notation to avoid repetitive documentation, not valid Rust syntax.

Due to a temporary restriction in Rust’s type system, the following traits are only implemented on tuples of arity 12 or less. In the future, this may change:

- `PartialEq`
- `Eq`
- `PartialOrd`
- `Ord`
- `Debug`
- `Default`
- `Hash`
- `From<[T; N]>`

The following traits are implemented for tuples of any length. These traits have implementations that are automatically generated by the compiler, so are not limited by missing language features.

- `Clone`
- `Copy`
- `Send`
- `Sync`
- `Unpin`
- `UnwindSafe`
- `RefUnwindSafe`

## Examples

Basic usage:

    let tuple = ("hello", 5, 'c');

    assert_eq!(tuple.0, "hello");

Run

Tuples are often used as a return type when you want to return more than one value:

    fn calculate_point() -> (i32, i32) {
        // Don't do a calculation, that's not the point of the example
        (4, 5)
    }

    let point = calculate_point();

    assert_eq!(point.0, 4);
    assert_eq!(point.1, 5);

    // Combining this with patterns can be nicer.

    let (x, y) = calculate_point();

    assert_eq!(x, 4);
    assert_eq!(y, 5);

Run

Homogeneous tuples can be created from arrays of appropriate length:

    let array: [u32; 3] = [1, 2, 3];
    let tuple: (u32, u32, u32) = array.into();

Run

## Trait Implementations§

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### impl<T> Debug for (T₁, T₂, …, Tₙ)where T: Debug + ?Sized,

This trait is implemented for tuples up to twelve items long.

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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<T> Default for (T₁, T₂, …, Tₙ)where T: Default,

This trait is implemented for tuples up to twelve items long.

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#### fn default() -> (T,)

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

### impl<'a, K, V, A> Extend<(&'a K, &'a V)> for BTreeMap<K, V, A>where K: Ord + Copy, V: Copy, A: Allocator + Clone,

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#### fn extend<I>(&mut self, iter: I)where I: IntoIterator<Item = (&'a K, &'a V)>,

Extends a collection with the contents of an iterator. Read more
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#### fn extend_one(&mut self, _: (&'a K, &'a V))

🔬This is a nightly-only experimental API. (`extend_one` #72631)
Extends a collection with exactly one element.
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#### fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (`extend_one` #72631)
Reserves capacity in a collection for the given number of additional elements. Read more
1.4.0 · source§

### impl<'a, K, V, S> Extend<(&'a K, &'a V)> for HashMap<K, V, S>where K: Eq + Hash + Copy, V: Copy, S: BuildHasher,

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#### fn extend<T: IntoIterator<Item = (&'a K, &'a V)>>(&mut self, iter: T)

Extends a collection with the contents of an iterator. Read more
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#### fn extend_one(&mut self, (k, v): (&'a K, &'a V))

🔬This is a nightly-only experimental API. (`extend_one` #72631)
Extends a collection with exactly one element.
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#### fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (`extend_one` #72631)
Reserves capacity in a collection for the given number of additional elements. Read more
1.56.0 · source§

### impl<A, B, ExtendA, ExtendB> Extend<(A, B)> for (ExtendA, ExtendB)where ExtendA: Extend<A>, ExtendB: Extend<B>,

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#### fn extend<T>(&mut self, into_iter: T)where T: IntoIterator<Item = (A, B)>,

Allows to `extend` a tuple of collections that also implement `Extend`.

See also: `Iterator::unzip`

##### Examples

    let mut tuple = (vec![0], vec![1]);
    tuple.extend([(2, 3), (4, 5), (6, 7)]);
    assert_eq!(tuple.0, [0, 2, 4, 6]);
    assert_eq!(tuple.1, [1, 3, 5, 7]);

    // also allows for arbitrarily nested tuples as elements
    let mut nested_tuple = (vec![1], (vec![2], vec![3]));
    nested_tuple.extend([(4, (5, 6)), (7, (8, 9))]);

    let (a, (b, c)) = nested_tuple;
    assert_eq!(a, [1, 4, 7]);
    assert_eq!(b, [2, 5, 8]);
    assert_eq!(c, [3, 6, 9]);

Run
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#### fn extend_one(&mut self, item: (A, B))

🔬This is a nightly-only experimental API. (`extend_one` #72631)
Extends a collection with exactly one element.
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#### fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (`extend_one` #72631)
Reserves capacity in a collection for the given number of additional elements. Read more
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### impl<K, V, A> Extend<(K, V)> for BTreeMap<K, V, A>where K: Ord, A: Allocator + Clone,

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#### fn extend<T>(&mut self, iter: T)where T: IntoIterator<Item = (K, V)>,

Extends a collection with the contents of an iterator. Read more
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#### fn extend_one(&mut self, _: (K, V))

🔬This is a nightly-only experimental API. (`extend_one` #72631)
Extends a collection with exactly one element.
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#### fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (`extend_one` #72631)
Reserves capacity in a collection for the given number of additional elements. Read more
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### impl<K, V, S> Extend<(K, V)> for HashMap<K, V, S>where K: Eq + Hash, S: BuildHasher,

Inserts all new key-values from the iterator and replaces values with existing keys with new values returned from the iterator.

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#### fn extend<T: IntoIterator<Item = (K, V)>>(&mut self, iter: T)

Extends a collection with the contents of an iterator. Read more
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#### fn extend_one(&mut self, (k, v): (K, V))

🔬This is a nightly-only experimental API. (`extend_one` #72631)
Extends a collection with exactly one element.
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#### fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (`extend_one` #72631)
Reserves capacity in a collection for the given number of additional elements. Read more
1.71.0 · source§

### impl<T> From<[T; 1]> for (T,)

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#### fn from(array: [T; 1]) -> (T,)

Converts to this type from the input type.
1.71.0 · source§

### impl<T> From<[T; 10]> for (T, T, T, T, T, T, T, T, T, T)

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#### fn from(array: [T; 10]) -> (T, T, T, T, T, T, T, T, T, T)

Converts to this type from the input type.
1.71.0 · source§

### impl<T> From<[T; 11]> for (T, T, T, T, T, T, T, T, T, T, T)

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#### fn from(array: [T; 11]) -> (T, T, T, T, T, T, T, T, T, T, T)

Converts to this type from the input type.
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### impl<T> From<[T; 12]> for (T, T, T, T, T, T, T, T, T, T, T, T)

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#### fn from(array: [T; 12]) -> (T, T, T, T, T, T, T, T, T, T, T, T)

Converts to this type from the input type.
1.71.0 · source§

### impl<T> From<[T; 2]> for (T, T)

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#### fn from(array: [T; 2]) -> (T, T)

Converts to this type from the input type.
1.71.0 · source§

### impl<T> From<[T; 3]> for (T, T, T)

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#### fn from(array: [T; 3]) -> (T, T, T)

Converts to this type from the input type.
1.71.0 · source§

### impl<T> From<[T; 4]> for (T, T, T, T)

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#### fn from(array: [T; 4]) -> (T, T, T, T)

Converts to this type from the input type.
1.71.0 · source§

### impl<T> From<[T; 5]> for (T, T, T, T, T)

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#### fn from(array: [T; 5]) -> (T, T, T, T, T)

Converts to this type from the input type.
1.71.0 · source§

### impl<T> From<[T; 6]> for (T, T, T, T, T, T)

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#### fn from(array: [T; 6]) -> (T, T, T, T, T, T)

Converts to this type from the input type.
1.71.0 · source§

### impl<T> From<[T; 7]> for (T, T, T, T, T, T, T)

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#### fn from(array: [T; 7]) -> (T, T, T, T, T, T, T)

Converts to this type from the input type.
1.71.0 · source§

### impl<T> From<[T; 8]> for (T, T, T, T, T, T, T, T)

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#### fn from(array: [T; 8]) -> (T, T, T, T, T, T, T, T)

Converts to this type from the input type.
1.71.0 · source§

### impl<T> From<[T; 9]> for (T, T, T, T, T, T, T, T, T)

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#### fn from(array: [T; 9]) -> (T, T, T, T, T, T, T, T, T)

Converts to this type from the input type.
1.17.0 · source§

### impl<I> From<(I, u16)> for SocketAddr where I: Into<IpAddr>,

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#### fn from(pieces: (I, u16)) -> SocketAddr

Converts a tuple struct (Into<`IpAddr`>, `u16`) into a `SocketAddr`.

This conversion creates a `SocketAddr::V4` for an `IpAddr::V4` and creates a `SocketAddr::V6` for an `IpAddr::V6`.

`u16` is treated as port of the newly created `SocketAddr`.

1.71.0 · source§

### impl<T> From<(T,)> for [T; 1]

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#### fn from(tuple: (T,)) -> [T; 1]

Converts to this type from the input type.
1.71.0 · source§

### impl<T> From<(T, T)> for [T; 2]

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#### fn from(tuple: (T, T)) -> [T; 2]

Converts to this type from the input type.
1.71.0 · source§

### impl<T> From<(T, T, T)> for [T; 3]

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#### fn from(tuple: (T, T, T)) -> [T; 3]

Converts to this type from the input type.
1.71.0 · source§

### impl<T> From<(T, T, T, T)> for [T; 4]

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#### fn from(tuple: (T, T, T, T)) -> [T; 4]

Converts to this type from the input type.
1.71.0 · source§

### impl<T> From<(T, T, T, T, T)> for [T; 5]

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#### fn from(tuple: (T, T, T, T, T)) -> [T; 5]

Converts to this type from the input type.
1.71.0 · source§

### impl<T> From<(T, T, T, T, T, T)> for [T; 6]

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#### fn from(tuple: (T, T, T, T, T, T)) -> [T; 6]

Converts to this type from the input type.
1.71.0 · source§

### impl<T> From<(T, T, T, T, T, T, T)> for [T; 7]

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#### fn from(tuple: (T, T, T, T, T, T, T)) -> [T; 7]

Converts to this type from the input type.
1.71.0 · source§

### impl<T> From<(T, T, T, T, T, T, T, T)> for [T; 8]

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#### fn from(tuple: (T, T, T, T, T, T, T, T)) -> [T; 8]

Converts to this type from the input type.
1.71.0 · source§

### impl<T> From<(T, T, T, T, T, T, T, T, T)> for [T; 9]

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#### fn from(tuple: (T, T, T, T, T, T, T, T, T)) -> [T; 9]

Converts to this type from the input type.
1.71.0 · source§

### impl<T> From<(T, T, T, T, T, T, T, T, T, T)> for [T; 10]

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#### fn from(tuple: (T, T, T, T, T, T, T, T, T, T)) -> [T; 10]

Converts to this type from the input type.
1.71.0 · source§

### impl<T> From<(T, T, T, T, T, T, T, T, T, T, T)> for [T; 11]

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#### fn from(tuple: (T, T, T, T, T, T, T, T, T, T, T)) -> [T; 11]

Converts to this type from the input type.
1.71.0 · source§

### impl<T> From<(T, T, T, T, T, T, T, T, T, T, T, T)> for [T; 12]

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#### fn from(tuple: (T, T, T, T, T, T, T, T, T, T, T, T)) -> [T; 12]

Converts to this type from the input type.
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### impl<K, V> FromIterator<(K, V)> for BTreeMap<K, V>where K: Ord,

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#### fn from_iter<T>(iter: T) -> BTreeMap<K, V>where T: IntoIterator<Item = (K, V)>,

Creates a value from an iterator. Read more
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### impl<K, V, S> FromIterator<(K, V)> for HashMap<K, V, S>where K: Eq + Hash, S: BuildHasher + Default,

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#### fn from_iter<T: IntoIterator<Item = (K, V)>>(iter: T) -> HashMap<K, V, S>

Creates a value from an iterator. Read more
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### impl<T> Hash for (T₁, T₂, …, Tₙ)where T: Hash + ?Sized,

This trait is implemented for tuples up to twelve items long.

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

Feeds this value into the given `Hasher`. Read more
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### impl<T> Ord for (T₁, T₂, …, Tₙ)where T: Ord + ?Sized,

This trait is implemented for tuples up to twelve items long.

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#### fn cmp(&self, other: &(T,)) -> Ordering

This method returns an `Ordering` between `self` and `other`. Read more
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### impl<T> PartialEq for (T₁, T₂, …, Tₙ)where T: PartialEq + ?Sized,

This trait is implemented for tuples up to twelve items long.

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

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &(T,)) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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### impl<T> PartialOrd for (T₁, T₂, …, Tₙ)where T: PartialOrd + ?Sized,

This trait is implemented for tuples up to twelve items long.

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#### fn partial_cmp(&self, other: &(T,)) -> Option<Ordering>

This method returns an ordering between `self` and `other` values if one exists. Read more
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#### fn lt(&self, other: &(T,)) -> bool

This method tests less than (for `self` and `other`) and is used by the `<` operator. Read more
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#### fn le(&self, other: &(T,)) -> bool

This method tests less than or equal to (for `self` and `other`) and is used by the `<=` operator. Read more
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#### fn ge(&self, other: &(T,)) -> bool

This method tests greater than or equal to (for `self` and `other`) and is used by the `>=` operator. Read more
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#### fn gt(&self, other: &(T,)) -> bool

This method tests greater than (for `self` and `other`) and is used by the `>` operator. Read more
1.28.0 · source§

### impl<'a, T> RangeBounds<T> for (Bound<&'a T>, Bound<&'a T>)where T: 'a + ?Sized,

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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: PartialOrd<T> + ?Sized,

Returns `true` if `item` is contained in the range. Read more
1.28.0 · source§

### impl<T> RangeBounds<T> for (Bound<T>, Bound<T>)

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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: PartialOrd<T> + ?Sized,

Returns `true` if `item` is contained in the range. Read more
1.53.0 · source§

### impl<T> SliceIndex<[T]> for (Bound<usize>, Bound<usize>)

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#### type Output = [T]

The output type returned by methods.
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#### fn get( self, slice: &[T] ) -> Option<&<(Bound<usize>, Bound<usize>) as SliceIndex<[T]>>::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 [T] ) -> Option<&mut <(Bound<usize>, Bound<usize>) as SliceIndex<[T]>>::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 [T] ) -> *const <(Bound<usize>, Bound<usize>) as SliceIndex<[T]>>::Output

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a shared reference to the output at this location, without performing any bounds checking. Calling this method with an out-of-bounds index or a dangling `slice` pointer is undefined behavior even if the resulting reference is not used.
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#### unsafe fn get_unchecked_mut( self, slice: *mut [T] ) -> *mut <(Bound<usize>, Bound<usize>) as SliceIndex<[T]>>::Output

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a mutable reference to the output at this location, without performing any bounds checking. Calling this method with an out-of-bounds index or a dangling `slice` pointer is undefined behavior even if the resulting reference is not used.
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#### fn index( self, slice: &[T] ) -> &<(Bound<usize>, Bound<usize>) as SliceIndex<[T]>>::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 [T] ) -> &mut <(Bound<usize>, Bound<usize>) as SliceIndex<[T]>>::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.
1.73.0 · source§

### impl SliceIndex<str> for (Bound<usize>, Bound<usize>)

Implements substring slicing for arbitrary bounds.

Returns a slice of the given string bounded by the byte indices provided by each bound.

This operation is O(1).

#### Panics

Panics if `begin` or `end` (if it exists and once adjusted for inclusion/exclusion) does not point to the starting byte offset of a character (as defined by `is_char_boundary`), if `begin > end`, or if `end > len`.

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#### type Output = str

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

🔬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 str>

🔬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 str

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a shared reference to the output at this location, without performing any bounds checking. Calling this method with an out-of-bounds index or a dangling `slice` pointer is undefined behavior even if the resulting reference is not used.
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#### unsafe fn get_unchecked_mut(self, slice: *mut str) -> *mut str

🔬This is a nightly-only experimental API. (`slice_index_methods`)
Returns a mutable reference to the output at this location, without performing any bounds checking. Calling this method with an out-of-bounds index or a dangling `slice` pointer is undefined behavior even if the resulting reference is not used.
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#### fn index(self, slice: &str) -> &str

🔬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 str

🔬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 ToSocketAddrs for (&str, u16)

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#### type Iter = IntoIter<SocketAddr>

Returned iterator over socket addresses which this type may correspond to.
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#### fn to_socket_addrs(&self) -> Result<IntoIter<SocketAddr>>

Converts this object to an iterator of resolved `SocketAddr`s. Read more
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### impl ToSocketAddrs for (IpAddr, u16)

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#### type Iter = IntoIter<SocketAddr>

Returned iterator over socket addresses which this type may correspond to.
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#### fn to_socket_addrs(&self) -> Result<IntoIter<SocketAddr>>

Converts this object to an iterator of resolved `SocketAddr`s. Read more
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### impl ToSocketAddrs for (Ipv4Addr, u16)

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#### type Iter = IntoIter<SocketAddr>

Returned iterator over socket addresses which this type may correspond to.
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#### fn to_socket_addrs(&self) -> Result<IntoIter<SocketAddr>>

Converts this object to an iterator of resolved `SocketAddr`s. Read more
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### impl ToSocketAddrs for (Ipv6Addr, u16)

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#### type Iter = IntoIter<SocketAddr>

Returned iterator over socket addresses which this type may correspond to.
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#### fn to_socket_addrs(&self) -> Result<IntoIter<SocketAddr>>

Converts this object to an iterator of resolved `SocketAddr`s. Read more
1.46.0 · source§

### impl ToSocketAddrs for (String, u16)

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#### type Iter = IntoIter<SocketAddr>

Returned iterator over socket addresses which this type may correspond to.
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#### fn to_socket_addrs(&self) -> Result<IntoIter<SocketAddr>>

Converts this object to an iterator of resolved `SocketAddr`s. Read more
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### impl<T> ConstParamTy for (T₁, T₂, …, Tₙ)where T: ConstParamTy,

This trait is implemented for tuples up to twelve items long.

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### impl<T> Eq for (T₁, T₂, …, Tₙ)where T: Eq + ?Sized,

This trait is implemented for tuples up to twelve items long.

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### impl<T> StructuralEq for (T₁, T₂, …, Tₙ)

This trait is implemented for tuples up to twelve items long.

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### impl<T> StructuralPartialEq for (T₁, T₂, …, Tₙ)

This trait is implemented for tuples up to twelve items long.

## Auto Trait Implementations§

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### impl<T> RefUnwindSafe for (T₁, T₂, …, Tₙ)where T: RefUnwindSafe,

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### impl<T> Send for (T₁, T₂, …, Tₙ)where T: Send,

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### impl<T> Sync for (T₁, T₂, …, Tₙ)where T: Sync,

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### impl<T> Unpin for (T₁, T₂, …, Tₙ)where T: Unpin,

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### impl<T> UnwindSafe for (T₁, T₂, …, Tₙ)where T: UnwindSafe,

## Blanket Implementations§

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### impl<T> Any for Twhere 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 Twhere 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 Twhere 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> 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 Twhere 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> ToOwned for Twhere 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<T, U> TryFrom<U> for Twhere 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 Twhere 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.