Trait serde::de::VariantVisitor

pub trait VariantVisitor {
    type Error: Error;
    fn visit_unit(self) -> Result<(), Self::Error>;
    fn visit_newtype<T>(self) -> Result<T, Self::Error> where T: Deserialize;
    fn visit_tuple<V>(self,
                      len: usize,
                      visitor: V)
                      -> Result<V::Value, Self::Error> where V: Visitor;
    fn visit_struct<V>(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 to deserialize the content of a particular enum variant.

Associated Types

type Error: Error

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

Required Methods

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

visit_unit is called when deserializing a variant with no values.

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

visit_newtype is called when deserializing a variant with a single value. A good default is often to use the visit_tuple method to deserialize a (value,).

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

visit_tuple is called when deserializing a tuple-like variant. If no tuple variants are expected, yield a Err(serde::de::Error::invalid_type(serde::de::Type::TupleVariant))

fn visit_struct<V>(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. If no struct variants are expected, yield a Err(serde::de::Error::invalid_type(serde::de::Type::StructVariant))

Implementors