Enum Setting

pub enum Setting<T>
where
    T: Default,
{
    Initial,
    Unset,
    Normal(T),
}

A configurable field follows 3-state logic.

Variants

Initial

Every settable property has a initial value

this.cfg = Default::default()

Unset

this.cfg = None

Normal(T)

this.cfg = Some(cfg)

Implementations

impl<T> Setting<T>

where T: Default,

pub fn set(&mut self, value: T)

Set a value to this field.

pub fn reset(&mut self)

Reset value of this field to default.

pub fn unset(&mut self)

Unset the current value

pub fn unwrap(self) -> T

Get value of this field

pub fn is_default(&self) -> bool

Check if this field has not been set

pub fn is_none(&self) -> bool

Check if this field has been set to none

pub fn is_some(&self) -> bool

Check if this field has been set to some value

Trait Implementations

impl<T> AddAssign<Option<T>> for Setting<T>

where T: Default,

fn add_assign(&mut self, rhs: Option<T>)

here None = Initial

impl<T> AddAssign<T> for Setting<T>

where T: Default,

fn add_assign(&mut self, rhs: T)

Performs the += operation.

impl<T> AddAssign for Setting<T>

where T: Default,

fn add_assign(&mut self, rhs: Self)

Performs the += operation.

impl<T> Clone for Setting<T>

where T: Default + Clone,

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> Debug for Setting<T>

where T: Default + Debug,

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

Formats the value using the given formatter.

impl<'de, T> Deserialize<'de> for Setting<T>

where T: Default + Deserialize<'de>,

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<T> Hash for Setting<T>

where T: Default + Hash,

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 for Setting<T>

where T: Default + PartialEq,

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

where T: Default + Serialize,

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl<T> Copy for Setting<T>

where T: Default + Copy,

impl<T> Eq for Setting<T>

where T: Default + Eq,

impl<T> StructuralPartialEq for Setting<T>

where T: Default,