Enum Setting 

pub enum Setting<T> {
    Unset,
    Set(T),
    Reset,
}

What a rule says about a setting that holds one value.

Variants

Unset

Nothing: a rule folded earlier decides, and with none upstream Wine.

Set(T)

This value, which beats that of every rule folded earlier.

Reset

default: from this rule on the setting is unset again, so upstream Wine decides unless a rule folded later sets it.

Implementations

impl<T> Setting<T>

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

The value it sets, or None when it is unset or reset.

pub const fn is_unset(&self) -> bool

Whether it says nothing.

pub fn map<U>(self, f: impl FnOnce(T) -> U) -> Setting<U>

The same setting with the value, if any, passed through f.

Trait Implementations

impl<T: Clone> Clone for Setting<T>

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

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Copy> Copy for Setting<T>

impl<T: Debug> Debug for Setting<T>

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

Formats the value using the given formatter.

impl<T> Default for Setting<T>

fn default() -> Setting<T>

Returns the “default value” for a type.

impl<T: Eq> Eq for Setting<T>

impl<T> From<T> for Setting<T>

fn from(value: T) -> Self

The setting that sets value.

impl<T: Hash> Hash for Setting<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: PartialEq> PartialEq for Setting<T>

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

Equality operator ==.

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

Inequality operator !=.

impl<T: PartialEq> StructuralPartialEq for Setting<T>