Enum Entry 

pub enum Entry<'a, VE>
where
    VE: ValueEncoding,
{
    Occupied(OccupiedEntry<'a, VE>),
    Vacant(VacantEntry<'a, VE>),
}

A view into a single location in a MetadataMap, which may be vacant or occupied.

Variants

Occupied(OccupiedEntry<'a, VE>)

An occupied entry

Vacant(VacantEntry<'a, VE>)

A vacant entry

Implementations

impl<'a, VE> Entry<'a, VE>

where VE: ValueEncoding,

pub fn or_insert(self, default: MetadataValue<VE>) -> &'a mut MetadataValue<VE>

Ensures a value is in the entry by inserting the default if empty.

Returns a mutable reference to the first value in the entry.

pub fn or_insert_with<F>(self, default: F) -> &'a mut MetadataValue<VE>

where F: FnOnce() -> MetadataValue<VE>,

Ensures a value is in the entry by inserting the result of the default function if empty.

The default function is not called if the entry exists in the map. Returns a mutable reference to the first value in the entry.

pub fn key(&self) -> &MetadataKey<VE>

Returns a reference to the entry’s key

Trait Implementations

impl<'a, VE> Debug for Entry<'a, VE>

where VE: Debug + ValueEncoding,

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

Formats the value using the given formatter.