Enum WatchKey 

pub enum WatchKey {
    Type(TypeId),
    Instance(u64),
}

Available on crate feature watch only.

What a watcher is watched as: one per type, or one per instance.

A type’s identity is its TypeId — the one identity that survives generics; the display name is kept only for messages, because keyed by name Db<Postgres> and Db<Mysql> both stringify to "Db" and the second start_watch() would silently watch nothing. A Dynamic instance has no usable TypeId — every Dynamic<Value> is the same type — so it carries a process-unique number instead, allocated at construction.

Variants

Type(TypeId)

One watcher per configuration type — the attribute’s contract.

Instance(u64)

One watcher per Dynamic instance.

Trait Implementations

impl Clone for WatchKey

fn clone(&self) -> WatchKey

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for WatchKey

impl Debug for WatchKey

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

Formats the value using the given formatter.

impl Eq for WatchKey

impl Ord for WatchKey

fn cmp(&self, other: &WatchKey) -> 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 WatchKey

fn eq(&self, other: &WatchKey) -> bool

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for WatchKey

fn partial_cmp(&self, other: &WatchKey) -> 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 StructuralPartialEq for WatchKey