Struct MetadataFieldRef 

pub struct MetadataFieldRef {
    pub component_id: ComponentId,
    pub name: Option<Cow<'static, str>>,
}

Names a metadata field: its component ID and, when one exists, its well-known or backend catalogue name.

The name is only a label. Every lookup resolves a ref by component_id, so a ref built on a client with another backend snapshot still names the same field. == compares the label too; compare component_ids to ask whether two refs name one field.

Fields

component_id: ComponentId

name: Option<Cow<'static, str>>

Implementations

impl MetadataFieldRef

pub const GROUP_NAME: Self

pub const GROUP_DESCRIPTION: Self

pub const GROUP_IMAGE_URL: Self

pub const GROUP_IMAGE: Self

pub const APP_DATA: Self

pub const USER_DISPLAY_NAME: Self

pub const MESSAGE_DISAPPEAR_FROM_NS: Self

pub const MESSAGE_DISAPPEAR_IN_NS: Self

pub const PUBLIC_WELL_KNOWN: [Self; 8]

The well-known fields an app may see, when the group registers them. Registry, role, membership, protocol, signer, and bootstrap components are internal.

pub const fn new(component_id: ComponentId) -> Self

An unnamed ref to component_id.

Trait Implementations

impl Clone for MetadataFieldRef

fn clone(&self) -> MetadataFieldRef

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MetadataFieldRef

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

Formats the value using the given formatter.

impl Hash for MetadataFieldRef

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 MetadataFieldRef

fn eq(&self, other: &MetadataFieldRef) -> 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 MetadataFieldRef

impl StructuralPartialEq for MetadataFieldRef