Struct Encoder 

pub struct Encoder { /* private fields */ }

FIX message encoder.

The encoder builds FIX messages by appending fields in tag=value format. It handles BeginString, BodyLength, and Checksum fields automatically.

Implementations

impl Encoder

pub fn new(begin_string: &'static str) -> Encoder

Creates a new encoder with the specified BeginString.

Arguments

• begin_string - The FIX version string (e.g., “FIX.4.4”)

pub fn with_capacity(begin_string: &'static str, capacity: usize) -> Encoder

Creates a new encoder with pre-allocated capacity.

Arguments

• begin_string - The FIX version string
• capacity - Initial buffer capacity in bytes

pub fn put_str(&mut self, tag: u32, value: &str)

Appends a field with a string value.

Arguments

• tag - The field tag number
• value - The field value

pub fn put_int(&mut self, tag: u32, value: i64)

Appends a field with an integer value.

Arguments

• tag - The field tag number
• value - The field value

pub fn put_uint(&mut self, tag: u32, value: u64)

Appends a field with an unsigned integer value.

Arguments

• tag - The field tag number
• value - The field value

pub fn put_bool(&mut self, tag: u32, value: bool)

Appends a field with a boolean value (Y/N).

Arguments

• tag - The field tag number
• value - The field value

pub fn put_char(&mut self, tag: u32, value: char)

Appends a field with a single character value.

Arguments

• tag - The field tag number
• value - The field value

pub fn put_raw(&mut self, tag: u32, value: &[u8])

Appends a field with raw bytes.

Arguments

• tag - The field tag number
• value - The field value bytes

pub fn finish(self) -> BytesMut

Finalizes the message and returns the complete encoded bytes.

This method:

1. Prepends BeginString (tag 8) and BodyLength (tag 9)
2. Appends Checksum (tag 10)

Returns

The complete FIX message as bytes.

pub fn body_len(&self) -> usize

Returns the current body length.

pub fn clear(&mut self)

Clears the encoder for reuse.

Trait Implementations

impl Debug for Encoder

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

Formats the value using the given formatter.

impl Default for Encoder

fn default() -> Encoder

Returns the “default value” for a type.