Trait ESExprOptionalFieldCodec

pub trait ESExprOptionalFieldCodec<'a>:
    ESExprEncodedEq
    + Sized
    + 'a {
    type Element: ESExprCodec<'a> + 'a;

    // Required methods
    fn encode_optional_field(&'a self) -> Option<ESExpr<'a>>;
    fn decode_optional_field(
        value: Option<ESExpr<'a>>,
    ) -> Result<Self, DecodeError>;
}

A field codec for optional fields.

Required Associated Types

type Element: ESExprCodec<'a> + 'a

The element type.

Required Methods

fn encode_optional_field(&'a self) -> Option<ESExpr<'a>>

Encode an optional field or None when the value should be excluded.

fn decode_optional_field(value: Option<ESExpr<'a>>) -> Result<Self, DecodeError>

Decode an optional field value.

Errors

Will return Err if decoding fails.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl<'a, A: ESExprCodec<'a>> ESExprOptionalFieldCodec<'a> for Option<A>

type Element = A

fn encode_optional_field(&'a self) -> Option<ESExpr<'a>>

fn decode_optional_field(value: Option<ESExpr<'a>>) -> Result<Self, DecodeError>

impl<'a, F: ESExprOptionalFieldCodec<'a>> ESExprOptionalFieldCodec<'a> for Box<F>

type Element = <F as ESExprOptionalFieldCodec<'a>>::Element

fn encode_optional_field(&'a self) -> Option<ESExpr<'a>>

fn decode_optional_field(value: Option<ESExpr<'a>>) -> Result<Self, DecodeError>

Implementors