Enum Choice

pub enum Choice<L, R> {
    L(L),
    R(R),
}

Represents a choice between two types, which you can compose to represent a choice between more types – Choice<C, Choice<A, B>> for instance.

See the top-level crate docs for more details.

Variants

L(L)

The “left” case.

R(R)

The “right” case.

Implementations

impl<A, B> Choice<A, B>

pub fn new(choice: A) -> Self

Constructs a Choice between two types, where the “decision” is of the first type.

pub fn or<L>(self) -> Choice<L, Choice<A, B>>

Wraps an existing Choice with an additional chooseable type.

impl<A> Choice<A, Never>

pub fn get(&self) -> &A

Returns the “left” value, as the right value is provably uninhabited.

Trait Implementations

impl<L: Clone, R: Clone> Clone for Choice<L, R>

fn clone(&self) -> Choice<L, R>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<A, B> Debug for Choice<A, B>

where A: Debug, B: Debug,

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

Formats the value using the given formatter.

impl<'de, L, R> Deserialize<'de> for Choice<L, R>

where L: Deserialize<'de>, R: Deserialize<'de>,

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<A, B> Display for Choice<A, B>

where A: Display, B: Display,

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

Formats the value using the given formatter.

impl<L: Hash, R: Hash> Hash for Choice<L, R>

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<L: Ord, R: Ord> Ord for Choice<L, R>

fn cmp(&self, other: &Choice<L, R>) -> 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<L: PartialEq, R: PartialEq> PartialEq for Choice<L, R>

fn eq(&self, other: &Choice<L, R>) -> 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<L: PartialOrd, R: PartialOrd> PartialOrd for Choice<L, R>

fn partial_cmp(&self, other: &Choice<L, R>) -> 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<L, R> Serialize for Choice<L, R>

where L: Serialize, R: Serialize,

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl<L: Copy, R: Copy> Copy for Choice<L, R>

impl<L: Eq, R: Eq> Eq for Choice<L, R>

impl<L, R> StructuralPartialEq for Choice<L, R>