Enum MapKey 

pub enum MapKey {
    Nil,
    Bool(bool),
    Int(i64),
    Float(u64),
    Str(Arc<str>),
    Symbol(Arc<str>),
    Keyword(Arc<str>),
}

Hashable subset of Value — every variant that has well-defined equality and hashing semantics. Used as the key type for Value::Map.

Float keys are stored as raw bit patterns so two NaNs hash to the same slot and equality is bit-exact. This trades IEEE-NaN-comparison semantics for usability — keys round-trip correctly.

Variants

Nil

Bool(bool)

Int(i64)

Float(u64)

Str(Arc<str>)

Symbol(Arc<str>)

Keyword(Arc<str>)

Implementations

impl MapKey

pub fn from_value(v: &Value) -> Option<Self>

Try to convert a Value into a hashable map key. Returns None for non-hashable variants (List, Map, Closure, NativeFn, Error, Sexp, Foreign).

pub fn to_value(&self) -> Value

Convert back to a Value. The reverse direction is total — every MapKey variant has a corresponding Value variant.

Trait Implementations

impl Clone for MapKey

fn clone(&self) -> MapKey

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MapKey

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

Formats the value using the given formatter.

impl Display for MapKey

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

Formats the value using the given formatter.

impl Hash for MapKey

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 MapKey

fn eq(&self, other: &MapKey) -> 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 Eq for MapKey

impl StructuralPartialEq for MapKey