Enum dmc::option_alternatives::Decision

pub enum Decision<T> {
    Manual(T),
    Auto,
}

Type for values which may be either set manually or left for the implementation to decide.

The actual meaning of Auto is often "best setting", but this is not required as it depends too much on context.

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

For a rationale, see https://english.stackexchange.com/a/203664

Variants

Manual(T)Auto

Methods

impl<T> Decision<T>

fn is_manual(&self) -> bool

fn is_auto(&self) -> bool

fn into_option(self) -> Option<T>

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

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

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

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

impl<T> Decision<Option<T>>

fn unwrap_all(self) -> T

Unwrap both this and the underlying Option.

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

fn is_manual_some(&self) -> bool

fn is_manual_none(&self) -> bool

impl<T: Default> Decision<Option<T>>

fn unwrap_all_or_default(self) -> T

Trait Implementations

impl<T: Clone> Clone for Decision<T>

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T: Copy> Copy for Decision<T>

impl<T: PartialEq> PartialEq for Decision<T>

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

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

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

This method tests for !=.

impl<T: PartialOrd> PartialOrd for Decision<T>

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

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

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

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

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

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

fn ge(&self, __arg_0: &Decision<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 Decision<T>

impl<T: Ord> Ord for Decision<T>

fn cmp(&self, __arg_0: &Decision<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 Decision<T>

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

Formats the value using the given formatter.

impl<T: Hash> Hash for Decision<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 Decision<T>

fn default() -> Self

Returns the "default value" for a type.

impl<T> From<T> for Decision<T>

fn from(val: T) -> Self

Performs the conversion.

impl<T> From<Option<T>> for Decision<T>

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

Performs the conversion.