Enum Smart

pub enum Smart<T> {
    Auto,
    Custom(T),
}

A value that can be automatically determined.

Variants

Auto

The value should be determined smartly based on the circumstances.

Custom(T)

A specific value.

Implementations

impl<T> Smart<T>

pub fn is_auto(&self) -> bool

Whether the value is Auto.

pub fn is_custom(&self) -> bool

Whether this holds a custom value.

pub fn is_custom_and<F>(self, f: F) -> bool

where F: Fn(T) -> bool,

Whether this is a Smart::Custom(x) and f(x) is true.

pub fn as_ref(&self) -> Smart<&T>

Returns a Smart<&T> borrowing the inner T.

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

Returns the contained custom value.

If the value is Smart::Auto, returns None.

Equivalently, this just converts Smart to Option.

pub fn map<F, U>(self, f: F) -> Smart<U>

where F: FnOnce(T) -> U,

Map the contained custom value with f.

pub fn map_or<F, U>(self, default: U, f: F) -> U

where F: FnOnce(T) -> U,

Map the contained custom value with f if it contains a custom value, otherwise returns default.

pub fn or(self, other: Smart<T>) -> Smart<T>

Keeps self if it contains a custom value, otherwise returns other.

pub fn or_else<F>(self, f: F) -> Smart<T>

where F: FnOnce() -> Smart<T>,

Keeps self if it contains a custom value, otherwise returns the output of the given function.

pub fn and_then<F, U>(self, f: F) -> Smart<U>

where F: FnOnce(T) -> Smart<U>,

Returns Auto if self is Auto, otherwise calls the provided function on the contained value and returns the result.

pub fn unwrap_or(self, default: T) -> T

Returns the contained custom value or a provided default value.

pub fn unwrap_or_else<F>(self, f: F) -> T

where F: FnOnce() -> T,

Returns the contained custom value or computes a default value.

pub fn unwrap_or_default(self) -> T

where T: Default,

Returns the contained custom value or the default value.

impl<T> Smart<Smart<T>>

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

Removes a single level of nesting, returns Auto if the inner or outer value is Auto.

Trait Implementations

impl<T> Clone for Smart<T>

where T: Clone,

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T> Debug for Smart<T>

where T: Debug,

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

Formats the value using the given formatter.

impl<T> Default for Smart<T>

fn default() -> Smart<T>

Returns the “default value” for a type.

impl<T> Fold for Smart<T>

where T: Fold,

fn fold(self, outer: Smart<T>) -> Smart<T>

Fold this inner value with an outer folded value.

impl<T> FromValue for Smart<T>

where T: FromValue,

fn from_value(value: Value) -> Result<Smart<T>, HintedString>

Try to cast the value into an instance of Self.

impl<T> Hash for Smart<T>

where T: Hash,

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

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> IntoValue for Smart<T>

where T: IntoValue,

fn into_value(self) -> Value

Cast this type into a value.

impl<T> Ord for Smart<T>

where T: Ord,

fn cmp(&self, other: &Smart<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,

Restrict a value to a certain interval.

impl<T> PartialEq for Smart<T>

where T: PartialEq,

fn eq(&self, other: &Smart<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> PartialOrd for Smart<T>

where T: PartialOrd,

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

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

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

Tests less than (for self and other) and is used by the < operator.

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

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

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

Tests greater than (for self and other) and is used by the > operator.

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

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

impl<T> Reflect for Smart<T>

where T: Reflect,

fn input() -> CastInfo

Describe what can be cast into this value.

fn output() -> CastInfo

Describe what this value can be cast into.

fn castable(value: &Value) -> bool

Whether the given value can be converted to T.

fn error(found: &Value) -> HintedString

Produce an error message for an unacceptable value type.

impl<T> Resolve for Smart<T>

where T: Resolve,

type Output = Smart<<T as Resolve>::Output>

The type of the resolved output.

fn resolve(self, styles: StyleChain<'_>) -> <Smart<T> as Resolve>::Output

Resolve the value using the style chain.

impl<T> Copy for Smart<T>

where T: Copy,

impl<T> Eq for Smart<T>

where T: Eq,

impl<T> StructuralPartialEq for Smart<T>