Struct Selector 

pub struct Selector<I, T>
where
    I: IntoIterator<Item = T>,
{ /* private fields */ }

Wraps a variable amount of choices and provides methods that guarantee selection from those choices.

Implementations

impl<I, T> Selector<I, T>

where I: IntoIterator<Item = T>,

pub fn with<const K: usize, C>(self, chooser: C) -> [T; K]

where C: FnOnce(Vec<Choice<'_, T>>) -> [Choice<'_, T>; K],

The function chooser is used to choose from our provided choices by returning a K-selection of it. The values of these choices are then returned by the function.

use choose_from::select_from;
let choices = vec!["Hi", "how", "are ya?"];

let chosen = select_from(choices).with(|mut choices| {
    // the provided choices allow inspection of the values
    let third = choices.pop().unwrap();
    assert_eq!(*third, "are ya?");
     
    // ignore 2nd
    choices.pop();

    let first = choices.pop().unwrap();
     
    // this is our selection
    [first, third]
});

assert_eq!(chosen, ["Hi", "are ya?"]);

pub fn any_with<C>(self, chooser: C) -> Vec<T>

where C: FnOnce(Vec<Choice<'_, T>>) -> Vec<Choice<'_, T>>,

Like with, but for returning any number of chosen values. Use this when you want to ensure some values come from the choices, but the amount of chosen values returned doesn’t matter.

use choose_from::select_from;

let choices = vec!["Hi", "how", "are ya?"];

let chosen = select_from(choices).any_with(|choices| {
    choices.into_iter().step_by(2).collect()
});

assert_eq!(chosen, ["Hi", "are ya?"]);

Trait Implementations

impl<I, T: Debug> Debug for Selector<I, T>

where I: IntoIterator<Item = T> + Debug,

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

Formats the value using the given formatter.

impl<I, T: Hash> Hash for Selector<I, T>

where I: IntoIterator<Item = T> + Hash,

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<I, T: PartialEq> PartialEq for Selector<I, T>

where I: IntoIterator<Item = T> + PartialEq,

fn eq(&self, other: &Selector<I, T>) -> 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<I, T: Eq> Eq for Selector<I, T>

where I: IntoIterator<Item = T> + Eq,

impl<I, T> StructuralPartialEq for Selector<I, T>

where I: IntoIterator<Item = T>,