Struct ImpossibleField

pub struct ImpossibleField;

A field and message encoder for fields that cannot be instantiated.

Trait Implementations

impl<T> DescribeMessage<T> for ImpossibleField

const DESCRIPTION: MessageDescription<'static>

The message description.

impl<T, R> FieldDecode<'_, T, R> for ImpossibleField

fn read_field( _item: &mut InplaceOption<'_, T>, _reader: FieldReader<'_, '_, R>, ) -> Result<(), Error>

Reads a field into item.

fn default_field(_item: &mut InplaceOption<'_, T>) -> Result<(), Error>

Instantiates item with its default value, if there is one.

fn packed<'p, C>() -> Option<&'p dyn PackedDecode<'a, T, C>>

where C: CopyExtend<T>, T: 'p,

Unless packed()::must_pack() is true, the sequence decoder must detect the encoding (packed or not) and call the appropriate method.

fn wrap_in_sequence() -> bool

Returns whether this field is wrapped in a message when encoded nested in a sequence (such as a repeated field).

fn read_field_in_sequence( item: &mut InplaceOption<'_, T>, reader: FieldReader<'a, '_, R>, ) -> Result<(), Error>

Reads this field that was encoded as part of a sequence, unwrapping it from a message if necessary.

const ENTRY: DecoderEntry<'a, T, R> = _

The table decoder entry for this type, used in types from table::decode.

impl<T, R> FieldEncode<T, R> for ImpossibleField

fn write_field(_item: T, _writer: FieldWriter<'_, '_, R>)

Writes item as a field.

fn compute_field_size(_item: &mut T, _sizer: FieldSizer<'_>)

Computes the size of item as a field.

fn packed<'a>() -> Option<&'a dyn PackedEncode<T>>

where T: 'a,

Returns the encoder for writing multiple instances of this field in a packed list, or None if there is no packed encoding for this type.

fn wrap_in_sequence() -> bool

Returns whether this field should be wrapped in a message when encoded nested in a sequence (such as a repeated field).

fn write_field_in_sequence(item: T, writer: &mut SequenceWriter<'_, '_, R>)

Writes this field as part of a sequence, wrapping it in a message if necessary.

fn compute_field_size_in_sequence(item: &mut T, sizer: &mut SequenceSizer<'_>)

Computes the size of this field as part of a sequence, including the size of a wrapping message.

const ENTRY: EncoderEntry<T, R> = _

The table encoder entry for this type, used in types from table::encode.

impl<T, R> MessageDecode<'_, T, R> for ImpossibleField

fn read_message( _item: &mut InplaceOption<'_, T>, _reader: MessageReader<'_, '_, R>, ) -> Result<(), Error>

Reads a message into item.

impl<T, R> MessageEncode<T, R> for ImpossibleField

fn write_message(_item: T, _writer: MessageWriter<'_, '_, R>)

Writes item as a message.

fn compute_message_size(_item: &mut T, _sizer: MessageSizer<'_>)

Computes the size of item as a message.