Struct MapField

pub struct MapField<K, V, EK, EV>(/* private fields */);

A field encoder for maps from K to V, using encoders EK and EV.

Trait Implementations

impl<T, K, V, EK, EV> DescribeField<T> for MapField<K, V, EK, EV>

where EK: DescribeField<K>, EV: DescribeField<V>,

const FIELD_TYPE: FieldType<'static>

The type of the field.

const PACKED_TYPE: Option<&'static str> = None

The type name of the field in a packed context.

impl<'a, K, V, T, EK, EV, R> FieldDecode<'a, T, R> for MapField<K, V, EK, EV>

where T: Default + Extend<(K, V)>, EK: FieldDecode<'a, K, R>, EV: FieldDecode<'a, V, R>,

fn read_field( item: &mut InplaceOption<'_, T>, reader: FieldReader<'a, '_, 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 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 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 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<K, V, T, EK, EV, R> FieldEncode<T, R> for MapField<K, V, EK, EV>

where T: IntoIterator<Item = (K, V)>, &'a mut T: for<'a> IntoIterator<Item = (&'a K, &'a mut V)>, EK: for<'a> FieldEncode<&'a K, R>, EV: FieldEncode<V, R>,

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 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 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 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.