Struct OptionKind 

pub struct OptionKind;

Marker for the Option type constructor.

Implements Kind such that OptionKind::Of<T> resolves to Option<T>.

Trait Implementations

impl<T: 'static> Applicative<T> for OptionKind

fn pure(value: T) -> Self::Of<T>

Lifts a value T into Some(T).

impl<A: 'static, B: 'static> Apply<A, B> for OptionKind

fn apply( value_container: Self::Of<A>, function_container: Self::Of<RcFn<A, B>>, ) -> Self::Of<B>

Applies a function wrapped in a Kind structure to a value wrapped in the same Kind structure.

impl<A: 'static, B: 'static> Bind<A, B> for OptionKind

fn bind( input: Self::Of<A>, func: impl FnMut(A) -> Self::Of<B> + Clone + 'static, ) -> Self::Of<B>

For Option, bind is equivalent to Option::and_then. If input is Some(a), it applies func to a. If input is None, it returns None.

impl Clone for OptionKind

fn clone(&self) -> OptionKind

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for OptionKind

impl Debug for OptionKind

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

Formats the value using the given formatter.

impl Default for OptionKind

fn default() -> OptionKind

Returns the “default value” for a type.

impl Eq for OptionKind

impl<A, B> Functor<A, B> for OptionKind

fn map( input: Self::Of<A>, func: impl FnMut(A) -> B + Clone + 'static, ) -> Self::Of<B>

Applies a function to a value (or values) within a Kind-encoded structure.

impl Hash for OptionKind

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 Kind for OptionKind

type Of<Arg> = Option<Arg>

The concrete type resulting from applying this Kind (type constructor) to a type argument Arg.

impl<A: 'static> Monad<A> for OptionKind

fn join(mma: Self::Of<Self::Of<A>>) -> Self::Of<A>

Flattens Option<Option<A>> to Option<A>. Some(Some(a)) becomes Some(a). Some(None) becomes None. None becomes None.

impl Ord for OptionKind

fn cmp(&self, other: &OptionKind) -> 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 PartialEq for OptionKind

fn eq(&self, other: &OptionKind) -> 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 PartialOrd for OptionKind

fn partial_cmp(&self, other: &OptionKind) -> 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 StructuralPartialEq for OptionKind