Struct ExtendUsing

pub struct ExtendUsing<F: ?Sized>(pub F);

Use an arbitrary FnMut type to implement Extend.

use extend_fn::ExtendUsing; 

let numbers = [5, 2, 11usize];

let mut result = 1usize; 
let mut extender = ExtendUsing::new(|value| result *= value);
extender.extend(numbers.iter().copied());

assert_eq!(numbers.iter().product::<usize>(), result);

For cases where you are writing into an actual container and want to transform items before their addition, consider using the extend_map crate instead.

Tuple Fields

0: F

Implementations

impl<F> ExtendUsing<F>

pub const fn new(f: F) -> Self

Trait Implementations

impl<F: Clone + ?Sized> Clone for ExtendUsing<F>

fn clone(&self) -> ExtendUsing<F>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<F: Debug + ?Sized> Debug for ExtendUsing<F>

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

Formats the value using the given formatter.

impl<F: Default + ?Sized> Default for ExtendUsing<F>

fn default() -> ExtendUsing<F>

Returns the “default value” for a type.

impl<Item, F: ?Sized + FnMut(Item)> Extend<Item> for ExtendUsing<F>

fn extend<I: IntoIterator<Item = Item>>(&mut self, iter: I)

Extends a collection with the contents of an iterator.

fn extend_one(&mut self, item: A)

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

Extends a collection with exactly one element.

fn extend_reserve(&mut self, additional: usize)

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

Reserves capacity in a collection for the given number of additional elements.

impl<F> From<F> for ExtendUsing<F>

fn from(value: F) -> Self

Converts to this type from the input type.

impl<F: Hash + ?Sized> Hash for ExtendUsing<F>

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

Feeds this value into the given Hasher.

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

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<F: Ord + ?Sized> Ord for ExtendUsing<F>

fn cmp(&self, other: &ExtendUsing<F>) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl<F: PartialEq + ?Sized> PartialEq for ExtendUsing<F>

fn eq(&self, other: &ExtendUsing<F>) -> bool

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<F: PartialOrd + ?Sized> PartialOrd for ExtendUsing<F>

fn partial_cmp(&self, other: &ExtendUsing<F>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<F: Copy + ?Sized> Copy for ExtendUsing<F>

impl<F: Eq + ?Sized> Eq for ExtendUsing<F>

impl<F: ?Sized> StructuralPartialEq for ExtendUsing<F>