Enum Vacancy 

#[non_exhaustive]
pub enum Vacancy {
    Unset,
    EmptyScalar,
    ValuelessArray,
    EmptyValueArray,
}

Subdivision of value states that may be considered as “not set”

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Unset

The variable is not set.

EmptyScalar

The value is a scalar with no characters.

ValuelessArray

The value is an array with no elements.

EmptyValueArray

The value is an array with one element containing no characters.

Implementations

impl Vacancy

pub fn of<'a, I: Into<Option<&'a Value>>>(value: I) -> Option<Vacancy>

Evaluates the vacancy of a value.

Returns None if the value does not fall into any of the Vacancy categories.

pub fn description(&self) -> &'static str

Trait Implementations

impl Clone for Vacancy

fn clone(&self) -> Vacancy

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Vacancy

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

Formats the value using the given formatter.

impl Display for Vacancy

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

Formats the value using the given formatter.

impl Hash for Vacancy

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 PartialEq for Vacancy

fn eq(&self, other: &Vacancy) -> 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 Copy for Vacancy

impl Eq for Vacancy

impl StructuralPartialEq for Vacancy