Struct Tag 

pub struct Tag { /* private fields */ }

A parsed field tag (field number + wire type).

Implementations

impl Tag

pub fn new(field_number: u32, wire_type: WireType) -> Self

Create a new tag.

Panics

Panics if field_number is not in the valid range [1, 2^29 – 1]. This is a programming error (generated code always uses valid field numbers); the panic fires in all build profiles.

pub fn field_number(&self) -> u32

Returns the field number carried by this tag.

pub fn wire_type(&self) -> WireType

Returns the wire type carried by this tag.

pub fn encode(&self, buf: &mut impl BufMut)

Encode a tag to a buffer.

pub fn decode(buf: &mut impl Buf) -> Result<Self, DecodeError>

Decode a tag from a buffer.

Single-byte tags (field numbers 1–15, any wire type) are handled inline without a call into decode_varint. With plain #[inline], LLVM often declines to inline decode_varint (three code paths: single-byte, unrolled-slice, slow-fallback) into per-field decode loops, so handling the one-byte case here avoids the out-of-line call for the overwhelmingly common case.

Trait Implementations

impl Clone for Tag

fn clone(&self) -> Tag

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Tag

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for Tag

fn eq(&self, other: &Tag) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Tag

impl Eq for Tag

impl StructuralPartialEq for Tag