Crate structible_macros 

Procedural macro implementation for structible.

This crate provides the #[structible] attribute macro, which transforms structs into map-backed types with generated accessors. Users should depend on the main structible crate, which re-exports this macro.

Design

The macro generates several items from a single struct definition:

• A field enum used as map keys (one variant per field)
• A value enum used as map values (wrapping each field’s type)
• A fields struct for ownership extraction via into_fields()
• The main struct backed by the chosen map type
• An impl block with accessors for all fields

Invariants

Required fields (non-Option) are guaranteed to be present after construction. The generated constructor enforces this by requiring values for all required fields. Getters for required fields return references directly, not Option, because the field is always present.

Optional Field Storage

Fields typed as Option<T> are stored as T in the backing map, not as Option<T>. Presence or absence in the map represents Some or None. This means:

• Getters return Option<&T> (present = Some, absent = None)
• Setters accept Option<T> (Some inserts, None removes)
• Removers extract the value if present

Attribute Macros

structible

Transforms a struct into a map-backed type with generated accessors.