Trait serde::de::VariantVisitor

pub trait VariantVisitor {
    type Error: Error;
    fn visit_variant<V>(&mut self) -> Result<V, Self::Error>
    where
        V: Deserialize;

    fn visit_unit(&mut self) -> Result<(), Self::Error> { ... }
    fn visit_newtype<T>(&mut self) -> Result<T, Self::Error>
    where
        T: Deserialize,
    { ... }
    fn visit_tuple<V>(
        &mut self, 
        _len: usize, 
        _visitor: V
    ) -> Result<V::Value, Self::Error>
    where
        V: Visitor,
    { ... }
    fn visit_struct<V>(
        &mut self, 
        _fields: &'static [&'static str], 
        _visitor: V
    ) -> Result<V::Value, Self::Error>
    where
        V: Visitor,
    { ... }
}

VariantVisitor is a visitor that is created by the Deserializer and passed to the Deserialize in order to deserialize a specific enum variant.

Associated Types

type Error: Error

The error type that can be returned if some error occurs during deserialization.

Required Methods

fn visit_variant<V>(&mut self) -> Result<V, Self::Error> where
    V: Deserialize, 

visit_variant is called to identify which variant to deserialize.

Provided Methods

fn visit_unit(&mut self) -> Result<(), Self::Error>

visit_unit is called when deserializing a variant with no values.

fn visit_newtype<T>(&mut self) -> Result<T, Self::Error> where
    T: Deserialize, 

visit_newtype is called when deserializing a variant with a single value. By default this uses the visit_tuple method to deserialize the value.

fn visit_tuple<V>(
    &mut self,
    _len: usize,
    _visitor: V
) -> Result<V::Value, Self::Error> where
    V: Visitor, 

visit_tuple is called when deserializing a tuple-like variant.

fn visit_struct<V>(
    &mut self,
    _fields: &'static [&'static str],
    _visitor: V
) -> Result<V::Value, Self::Error> where
    V: Visitor, 

visit_struct is called when deserializing a struct-like variant.

Implementations on Foreign Types

impl<'a, T> VariantVisitor for &'a mut T where     T: VariantVisitor,

type Error = T::Error

fn visit_variant<V>(&mut self) -> Result<V, T::Error> where     V: Deserialize,

fn visit_unit(&mut self) -> Result<(), T::Error>

fn visit_newtype<D>(&mut self) -> Result<D, T::Error> where     D: Deserialize,

fn visit_tuple<V>(     &mut self,     len: usize,     visitor: V ) -> Result<V::Value, T::Error> where     V: Visitor,

fn visit_struct<V>(     &mut self,     fields: &'static [&'static str],     visitor: V ) -> Result<V::Value, T::Error> where     V: Visitor,

Implementors

• impl<'a> VariantVisitor for StrDeserializer<'a> type Error = Error;

• impl<'a> VariantVisitor for StringDeserializer type Error = Error;