Enum Attribute

pub enum Attribute<T> {
    Present(T),
    Empty,
    Missing,
}

Available on crate feature typed only.

A typed attribute.

Variants

Present(T)

The attribute is present and has a value.

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Empty

The attribute is present but has no value.

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Missing

The attribute is not present.

Implementations

impl<T> Attribute<T>

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

Convert the attribute into a double layered Option.

Trait Implementations

impl<T> Clone for Attribute<T>

where T: Clone,

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T> Debug for Attribute<T>

where T: Debug,

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

Formats the value using the given formatter.

impl<T> Default for Attribute<T>

fn default() -> Attribute<T>

Returns the “default value” for a type.

impl<T> PartialEq for Attribute<T>

where T: PartialEq,

fn eq(&self, other: &Attribute<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> Copy for Attribute<T>

where T: Copy,

impl<T> Eq for Attribute<T>

where T: Eq,

impl<T> StructuralPartialEq for Attribute<T>