# Trait serde::ser::SerializeStructVariant [−] [src]

    pub trait SerializeStructVariant {
        type Ok;
        type Error: Error;
        fn serialize_field<T: ?Sized>(
            &mut self,
            key: &'static str,
            value: &T
        ) -> Result<(), Self::Error>
        where
            T: Serialize;
        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.

## Associated Types

### `type Ok` [src]

Must match the `Ok` type of our `Serializer`.

### `type Error: Error` [src]

Must match the `Error` type of our `Serializer`.

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## Required methods

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

Serialize a struct variant field.

### `fn end(self) -> Result<Self::Ok, Self::Error>` [src]

Finish serializing a struct variant.

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## Provided methods

### `fn skip_field(&mut self, key: &'static str) -> Result<(), Self::Error>` [src]

Indicate that a struct variant field has been skipped.

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## Implementors

### `impl<Ok, Error> SerializeStructVariant for Impossible<Ok, Error> where
Error: Error,` [src]

#### `type Ok = Ok`

#### `type Error = Error`

#### `fn serialize_field<T: ?Sized>(
&mut self,
key: &'static str,
value: &T
) -> Result<(), Error> where
T: Serialize,` [src]

#### `fn end(self) -> Result<Ok, Error>` [src]

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