Struct serde_with::MapFirstKeyWins
source · pub struct MapFirstKeyWins<K, V>(_);
Expand description
Ensure that the last value is taken, if duplicate values exist
By default serde has a first-value-wins implementation, if duplicate keys for a set exist. Sometimes the opposite strategy is desired. This helper implements a first-value-wins strategy.
The implementation supports both the HashSet
and the BTreeSet
from the standard library.
Trait Implementations§
source§impl<'de, K, V, KAs, VAs> DeserializeAs<'de, BTreeMap<K, V, Global>> for MapFirstKeyWins<KAs, VAs>where
KAs: DeserializeAs<'de, K>,
VAs: DeserializeAs<'de, V>,
K: Ord,
impl<'de, K, V, KAs, VAs> DeserializeAs<'de, BTreeMap<K, V, Global>> for MapFirstKeyWins<KAs, VAs>where KAs: DeserializeAs<'de, K>, VAs: DeserializeAs<'de, V>, K: Ord,
source§fn deserialize_as<D>(deserializer: D) -> Result<BTreeMap<K, V>, D::Error>where
D: Deserializer<'de>,
fn deserialize_as<D>(deserializer: D) -> Result<BTreeMap<K, V>, D::Error>where D: Deserializer<'de>,
Deserialize this value from the given Serde deserializer.
source§impl<'de, K, V, KAs, VAs, S> DeserializeAs<'de, HashMap<K, V, S>> for MapFirstKeyWins<KAs, VAs>where
KAs: DeserializeAs<'de, K>,
VAs: DeserializeAs<'de, V>,
K: Eq + Hash,
S: BuildHasher + Default,
impl<'de, K, V, KAs, VAs, S> DeserializeAs<'de, HashMap<K, V, S>> for MapFirstKeyWins<KAs, VAs>where KAs: DeserializeAs<'de, K>, VAs: DeserializeAs<'de, V>, K: Eq + Hash, S: BuildHasher + Default,
source§fn deserialize_as<D>(deserializer: D) -> Result<HashMap<K, V, S>, D::Error>where
D: Deserializer<'de>,
fn deserialize_as<D>(deserializer: D) -> Result<HashMap<K, V, S>, D::Error>where D: Deserializer<'de>,
Deserialize this value from the given Serde deserializer.
source§impl<'de, K, V, KAs, VAs, S> DeserializeAs<'de, IndexMap<K, V, S>> for MapFirstKeyWins<KAs, VAs>where
KAs: DeserializeAs<'de, K>,
VAs: DeserializeAs<'de, V>,
K: Eq + Hash,
S: BuildHasher + Default,
impl<'de, K, V, KAs, VAs, S> DeserializeAs<'de, IndexMap<K, V, S>> for MapFirstKeyWins<KAs, VAs>where KAs: DeserializeAs<'de, K>, VAs: DeserializeAs<'de, V>, K: Eq + Hash, S: BuildHasher + Default,
source§fn deserialize_as<D>(deserializer: D) -> Result<IndexMap<K, V, S>, D::Error>where
D: Deserializer<'de>,
fn deserialize_as<D>(deserializer: D) -> Result<IndexMap<K, V, S>, D::Error>where D: Deserializer<'de>,
Deserialize this value from the given Serde deserializer.
source§impl<K, KAs, V, VAs> SerializeAs<BTreeMap<K, V, Global>> for MapFirstKeyWins<KAs, VAs>where
KAs: SerializeAs<K>,
VAs: SerializeAs<V>,
impl<K, KAs, V, VAs> SerializeAs<BTreeMap<K, V, Global>> for MapFirstKeyWins<KAs, VAs>where KAs: SerializeAs<K>, VAs: SerializeAs<V>,
source§fn serialize_as<S>(
value: &BTreeMap<K, V>,
serializer: S
) -> Result<S::Ok, S::Error>where
S: Serializer,
fn serialize_as<S>( value: &BTreeMap<K, V>, serializer: S ) -> Result<S::Ok, S::Error>where S: Serializer,
Serialize this value into the given Serde serializer.
source§impl<K, KAs, V, VAs, H> SerializeAs<HashMap<K, V, H>> for MapFirstKeyWins<KAs, VAs>where
KAs: SerializeAs<K>,
VAs: SerializeAs<V>,
H: ?Sized + Sized,
impl<K, KAs, V, VAs, H> SerializeAs<HashMap<K, V, H>> for MapFirstKeyWins<KAs, VAs>where KAs: SerializeAs<K>, VAs: SerializeAs<V>, H: ?Sized + Sized,
source§fn serialize_as<S>(
value: &HashMap<K, V, H>,
serializer: S
) -> Result<S::Ok, S::Error>where
S: Serializer,
fn serialize_as<S>( value: &HashMap<K, V, H>, serializer: S ) -> Result<S::Ok, S::Error>where S: Serializer,
Serialize this value into the given Serde serializer.
source§impl<K, KAs, V, VAs, H> SerializeAs<IndexMap<K, V, H>> for MapFirstKeyWins<KAs, VAs>where
KAs: SerializeAs<K>,
VAs: SerializeAs<V>,
H: ?Sized + Sized,
impl<K, KAs, V, VAs, H> SerializeAs<IndexMap<K, V, H>> for MapFirstKeyWins<KAs, VAs>where KAs: SerializeAs<K>, VAs: SerializeAs<V>, H: ?Sized + Sized,
source§fn serialize_as<S>(
value: &IndexMap<K, V, H>,
serializer: S
) -> Result<S::Ok, S::Error>where
S: Serializer,
fn serialize_as<S>( value: &IndexMap<K, V, H>, serializer: S ) -> Result<S::Ok, S::Error>where S: Serializer,
Serialize this value into the given Serde serializer.