zerovec-derive 0.11.6

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Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify pkg:cargo/zerovec-derive@0.11.6
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/zerovec-derive@0.11.6

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

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}

//! Clean-room verification sample for zerovec-derive.

pub use zerovec_derive::*;

use zerovec::ule::AsULE;
use zerovec::ule::ULE;
use zerovec::ZeroVec;
use zerovec_derive::{make_ule, ULE as DeriveULE};

// 1. make_ule generates a ULE type and AsULE impl for a struct
#[make_ule(PointULE)]
#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
struct Point {
    x: u32,
    y: u32,
}

// 2. ULE derive macro implements ULE for a #[repr(C, packed)] struct
#[repr(C, packed)]
#[derive(Copy, Clone, Debug, PartialEq, Eq, DeriveULE)]
struct RawCoordULE {
    lat: <u32 as AsULE>::ULE,
    lon: <u32 as AsULE>::ULE,
}

// 3. make_ule generates ULE for a C-like repr(u8) enum
#[make_ule(StatusULE)]
#[repr(u8)]
#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
#[allow(dead_code)]
enum Status {
    Pending = 0,
    Active = 1,
    Completed = 2,
}

// 4. make_ule generates ULE for a tuple struct
#[make_ule(PairULE)]
#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
struct Pair(u8, u32);

fn main() {
    // 1. Struct with make_ule stored in ZeroVec
    let points = [Point { x: 10, y: 20 }, Point { x: 30, y: 40 }];
    let zv: ZeroVec<Point> = points.iter().copied().collect();
    assert_eq!(zv.len(), 2);
    assert_eq!(zv.get(0), Some(Point { x: 10, y: 20 }));
    let bytes = zv.as_bytes();
    let parsed: ZeroVec<Point> = ZeroVec::parse_bytes(bytes).expect("parse Point ZeroVec");
    assert_eq!(parsed, points.as_slice());

    // 2. Custom ULE struct validated with ULE::validate_bytes
    assert!(RawCoordULE::validate_bytes(bytes).is_ok());
    assert!(RawCoordULE::validate_bytes(&[0u8; 3]).is_err());

    // 3. Enum with make_ule parsed from bytes
    let s = Status::Active;
    assert_eq!(s as u8, 1);
    assert!(StatusULE::parse_bytes_to_slice(&[0]).is_ok());
    assert!(StatusULE::parse_bytes_to_slice(&[1]).is_ok());
    assert!(StatusULE::parse_bytes_to_slice(&[2]).is_ok());
    assert!(StatusULE::parse_bytes_to_slice(&[3]).is_err());

    // 4. Tuple struct with make_ule in ZeroVec
    let pairs = [Pair(1, 100), Pair(2, 200)];
    let zv_pairs: ZeroVec<Pair> = pairs.iter().copied().collect();
    assert_eq!(zv_pairs.len(), 2);
    let reparsed: ZeroVec<Pair> = ZeroVec::parse_bytes(zv_pairs.as_bytes()).expect("parse Pair ZeroVec");
    assert_eq!(reparsed, pairs.as_slice());

    println!("All zerovec_derive contract assertions passed successfully.");
}