Struct MessageBuilder 

pub struct MessageBuilder<const IS_INIT: bool> { /* private fields */ }

Generic builder for constructing Message instances.

The builder supports chaining calls to add header or body fields. Type-state (IS_INIT) tracks whether at least one body field was added, allowing MessageBuilder::build() to only be available after initialization.

Implementations

impl<const IS_INIT: bool> MessageBuilder<IS_INIT>

pub fn with_header(self, field: Field) -> Self

Adds a field to the message header.

pub fn with_field(self, field: Field) -> MessageBuilder<true>

Adds a field to the message body.

Each call appends a new Field in order of insertion. Once at least one field has been added, the builder transitions to an initialized state, enabling build.

impl MessageBuilder<true>

pub fn build(self) -> Message

Finalizes and returns the fully constructed Message.

Example usage:

use trafix_codec::message::{
    Message,
    field::{
        Field,
        value::{begin_string::BeginString, msg_type::MsgType},
    },
};

let msg = Message::builder(BeginString::FIX44, MsgType::Logout)
    .with_field(Field::Custom { tag: 58, value: b"Bye".to_vec() })
    .build();