Struct serde_tagged::de::adj::struc::KnownVisitor

pub struct KnownVisitor<T, V> { /* private fields */ }

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

This visitor handles a struct-based adjacently tagged value, which is represented by a struct containing exactly two fields. The first field of this tuple is named according to tag-key and contains tag, the second field is named according to value-key and contains the value. Thus this visitor will return an error if the visited type is not a map or sequence with two entries.

name is the name with which the struct that will be serialized.

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<T, V> KnownVisitor<T, V>

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

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

Trait Implementations

impl<'de, T, V> Visitor<'de> for KnownVisitor<T, V>

where T: DeserializeSeed<'de>, V: DeserializeSeed<'de>,

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_seq<A>(self, seq: A) -> Result<Self::Value, A::Error>

where A: SeqAccess<'de>,

The input contains a sequence of elements.

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

where A: EnumAccess<'de>,

The input contains an enum.