Derive Macro EnumPath 

#[derive(EnumPath)]
{
    // Attributes available to this derive:
    #[type_hint]
    #[enum_path]
}

Derive macro for generating Arrow buffer implementations for enums.

This macro automatically generates code that calls impl_enum_buffer! from polars-structpath, which creates:

• A buffer struct (e.g., StatusBuffer) implementing ArrowBuffer
• Helper methods for index conversion (from_arrow_idx, rust_idx_to_arrow_idx)
• IntoArrow implementation for the enum
• FromArrow implementation for the enum

Requirements

• The enum must be a unit enum (no fields in variants)
• All variants must have explicit discriminant values

Attributes

• #[type_hint(...)]: Currently accepted but not used. Reserved for future use.
• #[enum_path(...)]: Currently accepted but not used. Reserved for future use.

Example

use polars_structpath::EnumPath;
use polars_structpath::{IntoArrow, ArrowBuffer};

#[derive(EnumPath)]
enum Status {
    Active = 1,
    Inactive = 2,
}

// Now Status implements IntoArrow and FromArrow
let mut buffer = Status::new_buffer(2);
buffer.push(Status::Active);
buffer.push(Status::Inactive);
let array = buffer.to_arrow().unwrap();