Struct UserExtensionValues

pub struct UserExtensionValues { /* private fields */ }

Space for storing user extension values via ExtensionSerializer.

Implementations

impl UserExtensionValues

pub fn set<T: Send + Sync + 'static>(&mut self, val: T)

Set a user extension value.

This uses the type of the value as “key”, i.e. it can only hold a single per type. The user should make a wrapper type for the extension they want to parse/write.

let mut exts = ExtensionValues::default();

#[derive(Debug, PartialEq, Eq)]
struct MySpecialType(u8);

exts.user_values.set(MySpecialType(42));

pub fn get<T: Send + Sync + 'static>(&self) -> Option<&T>

Get a user extension value (by type).

let mut exts = ExtensionValues::default();

#[derive(Debug, PartialEq, Eq)]
struct MySpecialType(u8);

exts.user_values.set(MySpecialType(42));

let v = exts.user_values.get::<MySpecialType>();

assert_eq!(v, Some(&MySpecialType(42)));

pub fn set_arc<T: Send + Sync + 'static>(&mut self, val: Arc<T>)

Like .set(), but takes an Arc, which can be nice to avoid cloning large extension values.

pub fn get_arc<T: Send + Sync + 'static>(&self) -> Option<Arc<T>>

Like .get(), but clones and returns the Arc, which can be nice to avoid cloning large extension values.

Trait Implementations

impl Clone for UserExtensionValues

fn clone(&self) -> UserExtensionValues

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Default for UserExtensionValues

fn default() -> UserExtensionValues

Returns the “default value” for a type.

impl PartialEq for UserExtensionValues

fn eq(&self, other: &Self) -> 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 UserExtensionValues

impl UnwindSafe for UserExtensionValues