Enum dmc::option_alternatives::Knowledge

pub enum Knowledge<T> {
    Known(T),
    Unknown,
}

A value which is either known or unknown.

APIs should use this instead of Option when the conveyed meaning is more appropriate.

Variants

Known(T)Unknown

Methods

impl<T> Knowledge<T>

fn is_known(&self) -> bool

fn is_unknown(&self) -> bool

fn into_option(self) -> Option<T>

fn as_ref(&self) -> Knowledge<&T>

fn as_mut(&mut self) -> Knowledge<&mut T>

fn as_option(&self) -> Option<&T>

fn as_mut_option(&mut self) -> Option<&mut T>

impl<T> Knowledge<Option<T>>

fn unwrap_all(self) -> T

Unwrap both this and the underlying Option.

fn unwrap_all_or(self, alt: T) -> T

fn is_known_some(&self) -> bool

fn is_known_none(&self) -> bool

impl<T: Default> Knowledge<Option<T>>

fn unwrap_all_or_default(self) -> T

Trait Implementations

impl<T: Clone> Clone for Knowledge<T>

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T: Copy> Copy for Knowledge<T>

impl<T: PartialEq> PartialEq for Knowledge<T>

fn eq(&self, __arg_0: &Knowledge<T>) -> bool

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

fn ne(&self, __arg_0: &Knowledge<T>) -> bool

This method tests for !=.

impl<T: PartialOrd> PartialOrd for Knowledge<T>

fn partial_cmp(&self, __arg_0: &Knowledge<T>) -> Option<Ordering>

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

fn lt(&self, __arg_0: &Knowledge<T>) -> bool

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

fn le(&self, __arg_0: &Knowledge<T>) -> bool

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

fn gt(&self, __arg_0: &Knowledge<T>) -> bool

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

fn ge(&self, __arg_0: &Knowledge<T>) -> bool

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

impl<T: Eq> Eq for Knowledge<T>

impl<T: Ord> Ord for Knowledge<T>

fn cmp(&self, __arg_0: &Knowledge<T>) -> Ordering

This method returns an Ordering between self and other.

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

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

Compares and returns the maximum of two values.

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

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

Compares and returns the minimum of two values.

impl<T: Debug> Debug for Knowledge<T>

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl<T: Hash> Hash for Knowledge<T>

fn hash<__HT: Hasher>(&self, __arg_0: &mut __HT)

Feeds this value into the given [Hasher].

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

Feeds a slice of this type into the given [Hasher].

impl<T> Default for Knowledge<T>

fn default() -> Self

Returns the "default value" for a type.

impl<T> From<T> for Knowledge<T>

fn from(val: T) -> Self

Performs the conversion.

impl<T> From<Option<T>> for Knowledge<T>

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

Performs the conversion.