Struct EntryDelta 

pub struct EntryDelta<K, V> {
    pub add: Vec<(K, V)>,
    pub remove: Vec<K>,
}

A membership diff between two collections of key/value entries.

The two parts are asymmetric, and the map’s one-value-per-key rule is what makes them so: add carries whole entries because the receiver needs to be told the value, while remove carries bare keys because a key names an entry on its own.

A key that survived with a new value under it is an add, not a removal followed by one. Applying an addition overwrites whatever the key held, so the removal would say nothing the addition does not already say.

Nothing here records position — see SeqDelta for that.

Fields

add: Vec<(K, V)>

What a key holds in the new collection that it did not hold in the old one — both keys that arrived and keys whose value moved.

remove: Vec<K>

Keys that were in the old collection but are not in the new one.

Implementations

impl<K, V> EntryDelta<K, V>

pub fn is_empty(&self) -> bool

Whether the two collections held the same entries, and so nothing needs sending.

Trait Implementations

impl<K: Clone, V: Clone> Clone for EntryDelta<K, V>

fn clone(&self) -> EntryDelta<K, V>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<K: Debug, V: Debug> Debug for EntryDelta<K, V>

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

Formats the value using the given formatter.

impl<K, V> Default for EntryDelta<K, V>

fn default() -> Self

Returns the “default value” for a type.

impl<'de, K, V> Deserialize<'de> for EntryDelta<K, V>

where K: Deserialize<'de>, V: Deserialize<'de>,

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<K: Eq, V: Eq> Eq for EntryDelta<K, V>

impl<K: PartialEq, V: PartialEq> PartialEq for EntryDelta<K, V>

fn eq(&self, other: &EntryDelta<K, V>) -> bool

Equality operator ==.

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

Inequality operator !=.

impl<K, V> Serialize for EntryDelta<K, V>

where K: Serialize, V: Serialize,

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl<K: PartialEq, V: PartialEq> StructuralPartialEq for EntryDelta<K, V>