Trait MapMapValues 

pub trait MapMapValues<OldVal> {
    type MapValue<NewVal>;

    // Required method
    fn map_values<NewVal, MapFn>(self, map_fn: MapFn) -> Self::MapValue<NewVal>
       where MapFn: FnMut(OldVal) -> NewVal;
}

Trait for transforming the values of a map without changing the overall type of the data structure.

Required Associated Types

type MapValue<NewVal>

Output type, should be Self but with OldVal replaced with NewVal.

Required Methods

fn map_values<NewVal, MapFn>(self, map_fn: MapFn) -> Self::MapValue<NewVal>

where MapFn: FnMut(OldVal) -> NewVal,

Map the values into using the map_fn.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl<Key, OldVal> MapMapValues<OldVal> for BTreeMap<Key, OldVal>

where Key: Eq + Ord,

Available on crate feature alloc only.

type MapValue<NewVal> = BTreeMap<Key, NewVal>

fn map_values<NewVal, MapFn>(self, map_fn: MapFn) -> Self::MapValue<NewVal>

where MapFn: FnMut(OldVal) -> NewVal,

impl<Key, OldVal> MapMapValues<OldVal> for HashMap<Key, OldVal>

where Key: Eq + Hash,

Available on crate feature std only.

type MapValue<NewVal> = HashMap<Key, NewVal>

fn map_values<NewVal, MapFn>(self, map_fn: MapFn) -> Self::MapValue<NewVal>

where MapFn: FnMut(OldVal) -> NewVal,

Implementors

impl<K, OldVal, const N: usize> MapMapValues<OldVal> for ArrayMap<K, OldVal, N>

type MapValue<NewVal> = ArrayMap<K, NewVal, N>

impl<K, OldVal> MapMapValues<OldVal> for OptionMap<K, OldVal>

type MapValue<NewVal> = OptionMap<K, NewVal>

impl<K, OldVal> MapMapValues<OldVal> for SingletonMap<K, OldVal>

type MapValue<NewVal> = SingletonMap<K, NewVal>

impl<K, OldVal> MapMapValues<OldVal> for VecMap<K, OldVal>

Available on crate feature alloc only.

type MapValue<NewVal> = VecMap<K, NewVal>