Struct ChannelKey 

pub struct ChannelKey(pub u64);

A flavor-chosen stable identity for a channel.

Why the builder asks for this

The guide’s builder derives a channel’s scope from its parent but never says where its identity comes from. Something has to: the diff needs to recognize the same channel across two renders, and an identity that drifts burns a wire id every turn.

Deriving it from the name would be the obvious guess and is exactly the trap the guide names (15, “never put changing content in an identity”): a channel whose name carries a clock would be destroyed and recreated ten times a second. So the flavor states the identity explicitly and keeps the name a field. Two channels rendered in one turn with the same key is a build error, not a merge.

Tuple Fields

0: u64

Implementations

impl ChannelKey

pub const ROOT: ChannelKey

The key crate::build::ShardBuilder::root gives the shard’s root.

Named because a flavor addressing its whole tree has to spell it, and a bare zero in that position reads like a mistake.

Trait Implementations

impl Clone for ChannelKey

fn clone(&self) -> ChannelKey

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ChannelKey

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

Formats the value using the given formatter.

impl Hash for ChannelKey

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 Ord for ChannelKey

fn cmp(&self, other: &ChannelKey) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for ChannelKey

fn eq(&self, other: &ChannelKey) -> 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 PartialOrd for ChannelKey

fn partial_cmp(&self, other: &ChannelKey) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for ChannelKey

impl Eq for ChannelKey

impl StructuralPartialEq for ChannelKey