zerovec 0.11.7: 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 in pkg:cargo/zerovec@0.11.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/zerovec@0.11.7
Demonstrate these symbols/APIs:
  - 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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  "kind": "HOW",
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  "symbols": [
    "zerovec"
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}

//! Clean-room verification sample for zerovec.

pub use zerovec::*;

use zerovec::{ZeroVec, VarZeroVec, ZeroSlice, ZeroMap};

fn main() {
    // 1. ZeroVec constructs from slices, accesses elements by index, and converts to/from raw bytes
    let nums: &[u32] = &[10, 20, 30, 40, 50];
    let zv: ZeroVec<u32> = ZeroVec::alloc_from_slice(nums);
    assert_eq!(zv.len(), 5);
    assert!(!zv.is_empty());
    assert_eq!(zv.get(0), Some(10));
    assert_eq!(zv.get(4), Some(50));
    assert_eq!(zv.get(5), None);

    let bytes = zv.as_bytes();
    assert_eq!(bytes.len(), 20);
    let parsed: ZeroVec<u32> = ZeroVec::parse_bytes(bytes).expect("parse byte slice");
    assert_eq!(parsed, zv);
    assert_eq!(parsed.to_vec(), vec![10, 20, 30, 40, 50]);

    // Rejects unaligned or invalid length byte slices
    assert!(ZeroVec::<u32>::parse_bytes(&[1, 2, 3]).is_err());

    // 2. ZeroVec creates borrowed views from aligned slices without heap allocation
    let borrowed: ZeroVec<u32> = ZeroVec::try_from_slice(nums).expect("aligned little-endian slice");
    assert_eq!(borrowed, zv);
    assert!(!borrowed.is_owned());

    let empty: ZeroVec<u32> = ZeroVec::new();
    assert!(empty.is_empty());
    assert_eq!(empty.len(), 0);
    assert_eq!(empty.get(0), None);

    // 3. VarZeroVec handles variable-length elements such as UTF-8 strings
    let strings: &[&str] = &["apple", "banana", "cherry"];
    let vzv: VarZeroVec<str> = VarZeroVec::from(strings);
    assert_eq!(vzv.len(), 3);
    assert!(!vzv.is_empty());
    assert_eq!(vzv.get(0), Some("apple"));
    assert_eq!(vzv.get(1), Some("banana"));
    assert_eq!(vzv.get(2), Some("cherry"));
    assert_eq!(vzv.get(3), None);

    let vzv_bytes = vzv.as_bytes();
    let vzv_parsed: VarZeroVec<str> = VarZeroVec::parse_bytes(vzv_bytes).expect("parse var byte slice");
    assert_eq!(vzv_parsed, vzv);

    // Rejects invalid var byte slices
    assert!(VarZeroVec::<str>::parse_bytes(&[0xFF]).is_err());

    // 4. ZeroSlice provides read-only slice inspection, element extraction, and binary search
    let slice: &ZeroSlice<u32> = &*zv;
    assert_eq!(slice.len(), 5);
    assert_eq!(slice.first(), Some(10));
    assert_eq!(slice.last(), Some(50));
    assert_eq!(slice.get(2), Some(30));
    assert_eq!(slice.binary_search(&30), Ok(2));
    assert_eq!(slice.binary_search(&25), Err(2));

    // 5. ZeroMap enables key-value lookups over zero-copy backing stores
    let mut map: ZeroMap<u32, str> = ZeroMap::new();
    map.insert(&1, "one");
    map.insert(&2, "two");
    map.insert(&3, "three");
    assert_eq!(map.len(), 3);
    assert_eq!(map.get(&1), Some("one"));
    assert_eq!(map.get(&2), Some("two"));
    assert_eq!(map.get(&4), None);
    assert!(map.contains_key(&3));

    let removed = map.remove(&2);
    assert_eq!(removed, Some("two".into()));
    assert_eq!(map.len(), 2);
    assert_eq!(map.get(&2), None);

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