Struct serde_tagged::de::adj::map::KnownVisitor

pub struct KnownVisitor<'a, K, Kc: ?Sized + 'a, T, V> { /* private fields */ }

A visitor that can be used to deserialize a map-based adjacently tagged value of known type.

This visitor handles a map-based adjacently tagged value, which is represented by a map containing exactly two entries. One entry of this tuple is a mapping from tag-key to tag, the other entry contains a mapping from value-key to value. Thus this visitor will return an error if the visited type is not a map with two entries.

This visitor is intended for use of known values, i.e. when no tag-specific deserialization mehtod is required. Thus it does not need to cache values which can improve the performance.

Note

If you do not need to choose a specific deserialization-method based on the tag, you should prefer this visitor to Visitor.

Implementations

impl<'a, K, Kc: ?Sized, T, V> KnownVisitor<'a, K, Kc, T, V>

pub fn new( tag_seed: T, value_seed: V, tag_key: &'a Kc, value_key: &'a Kc ) -> Self

Creates a new visitor with the given tag-key and value-key.

Trait Implementations

impl<'de, 'a, K, Kc: ?Sized, T, V> Visitor<'de> for KnownVisitor<'a, K, Kc, T, V>

where T: DeserializeSeed<'de>, V: DeserializeSeed<'de>, K: Deserialize<'de> + PartialEq<&'a Kc>,

type Value = (<T as DeserializeSeed<'de>>::Value, <V as DeserializeSeed<'de>>::Value)

The value produced by this visitor.

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

Format a message stating what data this Visitor expects to receive.

fn visit_map<A>(self, map: A) -> Result<Self::Value, A::Error>

where A: MapAccess<'de>,

The input contains a key-value map.

fn visit_bool<E>(self, v: bool) -> Result<Self::Value, E>

where E: Error,

The input contains a boolean.

fn visit_i8<E>(self, v: i8) -> Result<Self::Value, E>

where E: Error,

The input contains an i8.

fn visit_i16<E>(self, v: i16) -> Result<Self::Value, E>

where E: Error,

The input contains an i16.

fn visit_i32<E>(self, v: i32) -> Result<Self::Value, E>

where E: Error,

The input contains an i32.

fn visit_i64<E>(self, v: i64) -> Result<Self::Value, E>

where E: Error,

The input contains an i64.

fn visit_i128<E>(self, v: i128) -> Result<Self::Value, E>

where E: Error,

The input contains a i128.

fn visit_u8<E>(self, v: u8) -> Result<Self::Value, E>

where E: Error,

The input contains a u8.

fn visit_u16<E>(self, v: u16) -> Result<Self::Value, E>

where E: Error,

The input contains a u16.

fn visit_u32<E>(self, v: u32) -> Result<Self::Value, E>

where E: Error,

The input contains a u32.

fn visit_u64<E>(self, v: u64) -> Result<Self::Value, E>

where E: Error,

The input contains a u64.

fn visit_u128<E>(self, v: u128) -> Result<Self::Value, E>

where E: Error,

The input contains a u128.

fn visit_f32<E>(self, v: f32) -> Result<Self::Value, E>

where E: Error,

The input contains an f32.

fn visit_f64<E>(self, v: f64) -> Result<Self::Value, E>

where E: Error,

The input contains an f64.

fn visit_char<E>(self, v: char) -> Result<Self::Value, E>

where E: Error,

The input contains a char.

fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>

where E: Error,

The input contains a string. The lifetime of the string is ephemeral and it may be destroyed after this method returns.

fn visit_borrowed_str<E>(self, v: &'de str) -> Result<Self::Value, E>

where E: Error,

The input contains a string that lives at least as long as the Deserializer.

fn visit_string<E>(self, v: String) -> Result<Self::Value, E>

where E: Error,

The input contains a string and ownership of the string is being given to the Visitor.

fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>

where E: Error,

The input contains a byte array. The lifetime of the byte array is ephemeral and it may be destroyed after this method returns.

fn visit_borrowed_bytes<E>(self, v: &'de [u8]) -> Result<Self::Value, E>

where E: Error,

The input contains a byte array that lives at least as long as the Deserializer.

fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E>

where E: Error,

The input contains a byte array and ownership of the byte array is being given to the Visitor.

fn visit_none<E>(self) -> Result<Self::Value, E>

where E: Error,

The input contains an optional that is absent.

fn visit_some<D>( self, deserializer: D ) -> Result<Self::Value, <D as Deserializer<'de>>::Error>

where D: Deserializer<'de>,

The input contains an optional that is present.

fn visit_unit<E>(self) -> Result<Self::Value, E>

where E: Error,

The input contains a unit ().

fn visit_newtype_struct<D>( self, deserializer: D ) -> Result<Self::Value, <D as Deserializer<'de>>::Error>

where D: Deserializer<'de>,

The input contains a newtype struct.

fn visit_seq<A>( self, seq: A ) -> Result<Self::Value, <A as SeqAccess<'de>>::Error>

where A: SeqAccess<'de>,

The input contains a sequence of elements.

fn visit_enum<A>( self, data: A ) -> Result<Self::Value, <A as EnumAccess<'de>>::Error>

where A: EnumAccess<'de>,

The input contains an enum.