Struct FixedExtension 

pub struct FixedExtension<const N: usize> {
    pub type: i8,
    /* private fields */
}

A fixed-capacity container for extension payloads of up to N bytes.

This type name refers to the fixed-size backing buffer, not the MessagePack header kind. The actual header used at encode-time depends on the current payload length:

• len == 1, 2, 4, 8, 16 → FixExtN
• otherwise (0..=255, 256..=65535, 65536..=u32::MAX) → Ext8/16/32

Fields

type: i8

Application‑defined extension type code.

Implementations

impl<const N: usize> FixedExtension<N>

pub fn new(type: i8, data: &[u8]) -> Option<Self>

Construct from a slice whose length must be <= N.

The chosen MessagePack format when encoding still follows the rules described in the type-level documentation above.

pub fn new_fixed(type: i8, data: [u8; N]) -> Self

Construct with an exact N-byte payload.

Note: Even when constructed with a fixed-size buffer, the encoder will emit FixExtN only if N is one of {1, 2, 4, 8, 16}. For any other N, the encoder uses Ext8/16/32 as appropriate.

pub fn as_ref(&self) -> ExtensionRef<'_>

Borrow as ExtensionRef for encoding.

pub fn len(&self) -> usize

Current payload length in bytes.

pub fn is_empty(&self) -> bool

Returns true if the payload is empty.

pub fn data(&self) -> &[u8]

Borrow the payload slice.

Trait Implementations

impl<const N: usize> Clone for FixedExtension<N>

fn clone(&self) -> FixedExtension<N>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<const N: usize> Debug for FixedExtension<N>

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

Formats the value using the given formatter.

impl<'a, const N: usize> Decode<'a> for FixedExtension<N>

type Value = FixedExtension<N>

The materialised value type.

fn decode(buf: &'a [u8]) -> Result<(Self::Value, &'a [u8]), Error>

Decode a value from the front of buf, returning the value and the remaining slice.

fn decode_with_format( format: Format, buf: &'a [u8], ) -> Result<(Self::Value, &'a [u8]), Error>

Decode a value assuming the leading MessagePack format has already been read by the caller. Implementations must validate that format is appropriate for the type and return an error otherwise.

impl<const N: usize, W: IoWrite> Encode<W> for FixedExtension<N>

fn encode(&self, writer: &mut W) -> Result<usize, Error<W::Error>>

Encode this value to MessagePack and write bytes to writer.

impl<const N: usize> Ord for FixedExtension<N>

fn cmp(&self, other: &FixedExtension<N>) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl<const N: usize> PartialEq for FixedExtension<N>

fn eq(&self, other: &FixedExtension<N>) -> 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<const N: usize> PartialOrd for FixedExtension<N>

fn partial_cmp(&self, other: &FixedExtension<N>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<const N: usize> Eq for FixedExtension<N>

impl<const N: usize> StructuralPartialEq for FixedExtension<N>