Struct Labels 

pub struct Labels(/* private fields */);

Structured key–value metadata based on BTreeMap.

Implementations

impl Labels

pub fn new() -> Self

Create an empty set of labels.

pub fn len(&self) -> usize

Returns the number of labels.

pub fn is_empty(&self) -> bool

Returns true if no labels are present.

pub fn insert<K, V>(&mut self, key: K, val: V) -> &mut Self

where K: Into<String>, V: Into<String>,

Insert or overwrite a label.

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

Get the value for a key, if present.

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

Check whether a key exists (regardless of its value).

pub fn iter(&self) -> impl Iterator<Item = (&str, &str)>

Iterate through all labels as (&str, &str) pairs.

Trait Implementations

impl Clone for Labels

fn clone(&self) -> Labels

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Labels

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

Formats the value using the given formatter.

impl Default for Labels

fn default() -> Labels

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Labels

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<'a> IntoIterator for &'a Labels

type Item = (&'a str, &'a str)

The type of the elements being iterated over.

type IntoIter = LabelsIter<'a>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl PartialEq for Labels

fn eq(&self, other: &Labels) -> 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 Serialize for Labels

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for Labels

impl StructuralPartialEq for Labels