Enum KeyLookup

pub enum KeyLookup {
    Named(&'static [&'static str]),
    Numbered(NonZero<usize>),
    Homogeneous(NonZero<usize>),
}

Data to look up field names and convert to indices

This struct used together with crate::TreeKey.

Variants

Named(&'static [&'static str])

Named children

Numbered(NonZero<usize>)

Numbered heterogeneous children

Homogeneous(NonZero<usize>)

Homogeneous numbered children

Implementations

impl KeyLookup

pub const fn homogeneous(len: usize) -> Self

Return a homogenenous unnamed KeyLookup

pub const fn numbered(len: usize) -> Self

Return a homogenenous unnamed KeyLookup

pub const fn len(&self) -> NonZero<usize>

Return the number of elements in the lookup

pub fn lookup(&self, index: usize) -> Result<Option<&'static str>, Traversal>

Perform a index-to-name lookup

Trait Implementations

impl Clone for KeyLookup

fn clone(&self) -> KeyLookup

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for KeyLookup

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

Formats the value using the given formatter.

impl Hash for KeyLookup

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 KeyLookup

fn eq(&self, other: &KeyLookup) -> 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 PartialOrd for KeyLookup

fn partial_cmp(&self, other: &KeyLookup) -> 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 Serialize for KeyLookup

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for KeyLookup