Struct UserMetadata 

pub struct UserMetadata<'a> { /* private fields */ }

Borrowed user metadata stored in a Metadata value.

Implementations

impl<'a> UserMetadata<'a>

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

Return the value associated with key.

pub fn len(&self) -> usize

Return the number of user metadata pairs.

pub fn is_empty(&self) -> bool

Return true when no user metadata pairs are present.

Trait Implementations

impl<'a> Clone for UserMetadata<'a>

fn clone(&self) -> UserMetadata<'a>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> Copy for UserMetadata<'a>

impl Debug for UserMetadata<'_>

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

Formats the value using the given formatter.

impl<'a> IntoIterator for UserMetadata<'a>

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

The type of the elements being iterated over.

type IntoIter = UserMetadataIntoIter<'a>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl<'a> IntoIterator for &UserMetadata<'a>

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

The type of the elements being iterated over.

type IntoIter = UserMetadataIntoIter<'a>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl Serialize for UserMetadata<'_>

fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.