Enum nothing::Probably

pub enum Probably<T> {
    Nothing,
    Something(T),
}

Probably is a better Option:

• Something is like Some
• Nothing is like None

Variants

Nothing

No value.

Something(T)

Some value of type T.

Implementations

impl<T> Probably<T>

pub const fn is_nothing(&self) -> bool

Returns true if self is of variant Nothing.

pub const fn is_something(&self) -> bool

Returns true if self is of variant Something.

pub fn as_something(&self) -> Option<&T>

Returns Some if self is a reference of variant Something, and None otherwise.

pub fn as_mut_something(&mut self) -> Option<&mut T>

Returns Some if self is a mutable reference of variant Something, and None otherwise.

pub fn expect_something(self) -> T

where Self: Debug,

Unwraps the value, yielding the content of Something.

Panics

Panics if the value is not Something, with a panic message including the content of self.

pub fn something(self) -> Option<T>

Returns Some if self is of variant Something, and None otherwise.

impl<T> Probably<Probably<T>>

pub fn flatten(self) -> Probably<T>

Converts from Probably<Probably<T>> to Probably<T>.

Examples

Basic usage:

let x: Probably<Probably<u32>> = Something(Something(6));
assert_eq!(Something(6), x.flatten());

let x: Probably<Probably<u32>> = Something(Nothing);
assert_eq!(Nothing, x.flatten());

let x: Probably<Probably<u32>> = Nothing;
assert_eq!(Nothing, x.flatten());

Flattening only removes one level of nesting at a time:

let x: Probably<Probably<Probably<u32>>> = Something(Something(Something(6)));
assert_eq!(Something(Something(6)), x.flatten());
assert_eq!(Something(6), x.flatten().flatten());

Trait Implementations

impl<T: Clone> Clone for Probably<T>

fn clone(&self) -> Probably<T>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for Probably<T>

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

Formats the value using the given formatter.

impl<T> Default for Probably<T>

fn default() -> Probably<T>

Returns the “default value” for a type.

impl<T> From<Option<T>> for Probably<T>

fn from(x: Option<T>) -> Self

Converts to this type from the input type.

impl<T> From<T> for Probably<T>

fn from(x: T) -> Self

Converts to this type from the input type.

impl<T> FromResidual for Probably<T>

fn from_residual(residual: Probably<Infallible>) -> Self

🔬This is a nightly-only experimental API. (try_trait_v2)

Constructs the type from a compatible Residual type.

impl<T: Hash> Hash for Probably<T>

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<T> Into<Option<T>> for Probably<T>

fn into(self) -> Option<T>

Converts this type into the (usually inferred) input type.

impl<T: Ord> Ord for Probably<T>

fn cmp(&self, other: &Probably<T>) -> 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 + PartialOrd,

Restrict a value to a certain interval.

impl<T: PartialEq> PartialEq for Probably<T>

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

This method tests for self and other values to be equal, and is used by ==.

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

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

impl<T: PartialOrd> PartialOrd for Probably<T>

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

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

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

This method tests less than (for self and other) and is used by the < operator.

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

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

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

This method tests greater than (for self and other) and is used by the > operator.

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

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

impl<T> Termination for Probably<T>

fn report(self) -> ExitCode

Is called to get the representation of the value as status code. This status code is returned to the operating system.

impl<T> Try for Probably<T>

type Output = T

🔬This is a nightly-only experimental API. (try_trait_v2)

The type of the value produced by ? when not short-circuiting.

type Residual = Probably<Infallible>

🔬This is a nightly-only experimental API. (try_trait_v2)

The type of the value passed to FromResidual::from_residual as part of ? when short-circuiting.

fn from_output(output: Self::Output) -> Self

🔬This is a nightly-only experimental API. (try_trait_v2)

Constructs the type from its Output type.

fn branch(self) -> ControlFlow<Self::Residual, Self::Output>

🔬This is a nightly-only experimental API. (try_trait_v2)

Used in ? to decide whether the operator should produce a value (because this returned ControlFlow::Continue) or propagate a value back to the caller (because this returned ControlFlow::Break).

impl<T: Copy> Copy for Probably<T>

impl<T: Eq> Eq for Probably<T>

impl<T> StructuralEq for Probably<T>

impl<T> StructuralPartialEq for Probably<T>