Struct protobuf_codec::field::FieldDecoder

pub struct FieldDecoder<F, D: ValueDecode> { /* fields omitted */ }

Decoder for required scalar fields.

Methods

impl<F, D: ValueDecode> FieldDecoder<F, D>

pub fn new(field_num: F, value_decoder: D) -> Self

Makes a new FieldDecoder instance.

Trait Implementations

impl<F: Debug, D: Debug + ValueDecode> Debug for FieldDecoder<F, D>

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl<F: Default, D: Default + ValueDecode> Default for FieldDecoder<F, D>

fn default() -> FieldDecoder<F, D>

Returns the "default value" for a type.

impl<F, D> Decode for FieldDecoder<F, D> where
    F: Copy + Into<FieldNum>,
    D: ValueDecode, 

type Item = D::Item

The type of items to be decoded.

fn decode(&mut self, buf: &[u8], eos: Eos) -> Result<usize>

Consumes the given buffer (a part of a byte sequence), and proceeds the decoding process.

fn finish_decoding(&mut self) -> Result<Self::Item>

Finishes the current decoding process and returns the decoded item.

fn is_idle(&self) -> bool

Returns true if there are no items to be decoded by the decoder at the next invocation of decode method, otherwise false.

fn requiring_bytes(&self) -> ByteCount

Returns the lower bound of the number of bytes needed to decode the next item.

impl<F, D> FieldDecode for FieldDecoder<F, D> where
    F: Copy + Into<FieldNum>,
    D: ValueDecode, 

fn start_decoding(&mut self, tag: Tag) -> Result<bool>

Tries to start decoding a field.

impl<F, D> RequiredFieldDecode for FieldDecoder<F, D> where
    F: Copy + Into<FieldNum>,
    D: ValueDecode, 

fn is_present(&self) -> bool

Returns true if this field has been present in the target input stream, otherwise false.