Enum KeywordOrString 

pub enum KeywordOrString<T: Copy> {
    Known(T),
    Unknown(String),
}

Known keyword (enum) value, or arbitrary string

T should be a Copy enum with unit variants. It should have appropriate FromStr and Display, as well as NormalItemArgument, impls.

Then KeywordOrString will implement the same traits.

Unlike Unknown, unknown values are always retained as strings.

Variants

Known(T)

Known and recognised T

Unknown(String)

Unknown value in arbitrary syntax

Trait Implementations

impl<T: Clone + Copy> Clone for KeywordOrString<T>

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

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Debug + Copy> Debug for KeywordOrString<T>

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

Formats the value using the given formatter.

impl<T: Copy + Display> Display for KeywordOrString<T>

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

Formats the value using the given formatter.

impl<T: Copy + FromStr> FromStr for KeywordOrString<T>

type Err = Void

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Self, Void>

Parses a string s to return a value of this type.

impl<T: Hash + Copy> Hash for KeywordOrString<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 + Copy> PartialEq for KeywordOrString<T>

fn eq(&self, other: &KeywordOrString<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 + NormalItemArgument> NormalItemArgument for KeywordOrString<T>

impl<T: Copy> StructuralPartialEq for KeywordOrString<T>