IronFix Core

Core types, traits, and error definitions for the IronFix FIX protocol engine.

This is the root of the workspace dependency graph: it depends on no other IronFix crate, and every other crate speaks the vocabulary defined here.

• Error types: [FixError] and its children [DecodeError], [EncodeError], [SessionError] and [StoreError], all built with thiserror
• Field types: [FieldTag], [FieldRef], [FieldValue], and the [FixField] trait
• Message types: [RawMessage], [OwnedMessage], [MsgType], and the [FixMessage] trait
• Core types: [SeqNum], [Timestamp], [CompId] (an inline ArrayString, not a String), and [Side]
• Protocol versions: [FixVersion], the single mapping from a FIX version to its BeginString (8) and ApplVerID (1128 / 1137)

Zero-Copy Design

The core abstractions support both zero-copy borrowed views (for hot-path processing) and owned representations (for storage and cross-thread transfer).