Trait serde::ser::SerializeStructVariant

pub trait SerializeStructVariant {
    type Ok;
    type Error: Error;

    fn serialize_field<T>(
        &mut self,
        key: &'static str,
        value: &T
    ) -> Result<(), Self::Error>
    where
        T: Serialize + ?Sized;
    fn end(self) -> Result<Self::Ok, Self::Error>;

    fn skip_field(&mut self, key: &'static str) -> Result<(), Self::Error> { ... }
}

Returned from Serializer::serialize_struct_variant.

Example use

use serde::ser::{Serialize, SerializeStructVariant, Serializer};

enum E {
    S { r: u8, g: u8, b: u8 },
}

impl Serialize for E {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        match *self {
            E::S {
                ref r,
                ref g,
                ref b,
            } => {
                let mut sv = serializer.serialize_struct_variant("E", 0, "S", 3)?;
                sv.serialize_field("r", r)?;
                sv.serialize_field("g", g)?;
                sv.serialize_field("b", b)?;
                sv.end()
            }
        }
    }
}

Example implementation

The example data format presented on the website demonstrates an implementation of SerializeStructVariant for a basic JSON data format.

Required Associated Types

type Ok

Must match the Ok type of our Serializer.

type Error: Error

Must match the Error type of our Serializer.

Required Methods

fn serialize_field<T>(
    &mut self,
    key: &'static str,
    value: &T
) -> Result<(), Self::Error>where
    T: Serialize + ?Sized,

Serialize a struct variant field.

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

Finish serializing a struct variant.

Provided Methods

fn skip_field(&mut self, key: &'static str) -> Result<(), Self::Error>

Indicate that a struct variant field has been skipped.

Implementors

impl<Ok, Error> SerializeStructVariant for Impossible<Ok, Error>where
    Error: Error,

type Ok = Ok

type Error = Error