Struct Encoder 

pub struct Encoder { /* private fields */ }

A reusable FIX message encoder.

Owns a body buffer that is allocated once and reused across every encode call — zero allocation per message on the hot path after the first call.

Example

let mut enc = Encoder::new();
let mut out = Vec::new();
enc.encode(&msg, &mut out)?;

Implementations

impl Encoder

pub fn new() -> Self

Create a new encoder with default inline body-buffer capacity.

pub fn with_capacity(capacity: usize) -> Self

Create a new encoder pre-allocated for capacity body bytes.

pub fn disable_auto_calculate_body_length(&mut self, disable: bool) -> &mut Self

When set to true, tag 9 (BodyLength) will not be auto-computed. If the message contains tag 9, its value is written as-is; otherwise the field is omitted entirely.

When false (the default), tag 9 is always computed from the body length.

pub fn disable_auto_calculate_checksum(&mut self, disable: bool) -> &mut Self

When set to true, tag 10 (CheckSum) will not be auto-computed. If the message contains tag 10, its value is written as-is; otherwise the field is omitted entirely.

When false (the default), tag 10 is always computed from the message bytes.

pub fn encode( &mut self, msg: &Message<'_>, out: &mut Vec<u8>, ) -> Result<(), FixError>

Encode msg as a complete FIX wire message into out.

out is cleared first. By default, tag 9 (BodyLength) and tag 10 (CheckSum) are computed automatically and any existing 9 or 10 fields in msg are ignored. Use disable_auto_calculate_body_length(true) or disable_auto_calculate_checksum(true) to write the message’s own values instead. If tag 8 (BeginString) is absent, FIX.4.4 is used as the default version.

Trait Implementations

impl Default for Encoder

fn default() -> Self

Returns the “default value” for a type.