zerovec 0.11.6: zerovec::ZeroVec

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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 zerovec::ZeroVec in pkg:cargo/zerovec@0.11.6
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/zerovec@0.11.6
Demonstrate these symbols/APIs:
  - zerovec::ZeroVec

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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  "symbols": [
    "zerovec::ZeroVec"
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//! Clean-room verification sample for zerovec::ZeroVec.

pub use zerovec::ZeroVec;

use zerovec::ZeroVec;

fn main() {
    // 1. ZeroVec parses little-endian byte buffers into zero-copy slices and retrieves elements by index
    let bytes: &[u8] = &[0x0A, 0x00, 0x14, 0x00, 0x1E, 0x00]; // 10, 20, 30 as u16 LE
    let zv: ZeroVec<u16> = ZeroVec::parse_bytes(bytes).expect("valid u16 byte slice");
    assert_eq!(zv.len(), 3);
    assert!(!zv.is_empty());
    assert_eq!(zv.get(0), Some(10));
    assert_eq!(zv.get(1), Some(20));
    assert_eq!(zv.get(2), Some(30));
    assert_eq!(zv.get(3), None);
    assert_eq!(zv.as_bytes(), bytes);
    assert!(!zv.is_owned());

    // 2. ZeroVec constructs empty instances and borrows directly from typed slices
    let empty: ZeroVec<u16> = ZeroVec::new();
    assert_eq!(empty.len(), 0);
    assert!(empty.is_empty());
    assert_eq!(empty.get(0), None);

    let slice_data: &[u16] = &[100, 200, 300, 400];
    let borrowed_zv = ZeroVec::try_from_slice(slice_data).expect("borrowable slice");
    assert_eq!(borrowed_zv.len(), 4);
    assert_eq!(borrowed_zv.get(1), Some(200));
    assert_eq!(borrowed_zv.first(), Some(100));
    assert_eq!(borrowed_zv.last(), Some(400));
    assert!(!borrowed_zv.is_owned());

    // 3. ZeroVec allocates owned instances from slices and supports in-place element mutation
    let nums: &[u32] = &[1, 2, 3];
    let mut owned_zv: ZeroVec<u32> = ZeroVec::alloc_from_slice(nums);
    assert_eq!(owned_zv.len(), 3);
    assert!(owned_zv.is_owned());
    assert_eq!(owned_zv.to_vec(), vec![1, 2, 3]);
    owned_zv.for_each_mut(|item| *item *= 10);
    assert_eq!(owned_zv.to_vec(), vec![10, 20, 30]);

    // 4. ZeroVec supports binary search and iteration over elements
    let sorted_bytes: &[u8] = &[0x05, 0x00, 0x0F, 0x00, 0x19, 0x00, 0x23, 0x00]; // 5, 15, 25, 35 as u16 LE
    let search_zv: ZeroVec<u16> = ZeroVec::parse_bytes(sorted_bytes).expect("valid u16 byte slice");
    assert_eq!(search_zv.binary_search(&15), Ok(1));
    assert_eq!(search_zv.binary_search(&20), Err(2));

    let collected: Vec<u16> = search_zv.iter().collect();
    assert_eq!(collected, vec![5, 15, 25, 35]);

    println!("All zerovec::ZeroVec contract assertions passed successfully.");
}