Struct OptionMap 

pub struct OptionMap<K: PartialEq, V> { /* private fields */ }

A mapping from keys to optional values.

Wraps a Vec<(K, Option<V>)> and provides convenient access methods.

Implementations

impl<K: PartialEq, V> OptionMap<K, V>

pub fn new() -> Self

Create an empty OptionMap.

pub fn set(&mut self, key: K, value: Option<V>)

Set the value for key (may be None to mark as missing).

pub fn get(&self, key: &K) -> Option<&V>

Get the value for key, or None if not present or explicitly set to None.

pub fn contains_key(&self, key: &K) -> bool

Returns true if the key exists (even if mapped to None).

pub fn len(&self) -> usize

Number of entries.

pub fn is_empty(&self) -> bool

Returns true if empty.

pub fn some_keys(&self) -> Vec<&K>

Collect all keys with Some values.

pub fn none_keys(&self) -> Vec<&K>

Collect all keys with None values.

pub fn iter(&self) -> impl Iterator<Item = &(K, Option<V>)>

Iterate over all entries.

Trait Implementations

impl<K: Clone + PartialEq, V: Clone> Clone for OptionMap<K, V>

fn clone(&self) -> OptionMap<K, V>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<K: Debug + PartialEq, V: Debug> Debug for OptionMap<K, V>

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

Formats the value using the given formatter.

impl<K: Default + PartialEq, V: Default> Default for OptionMap<K, V>

fn default() -> OptionMap<K, V>

Returns the “default value” for a type.