zerovec 0.11.6

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zerovec = { version = "=0.11.6", features = ["alloc"] }

[[bin]]
name = "contract"
path = "test/contract.rs"

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@0.11.6
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/zerovec@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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  "goal": "verify pkg:cargo/zerovec@0.11.6",
  "kind": "HOW",
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  ]
}

//! Clean-room verification sample for zerovec.

pub use zerovec::*;

use zerovec::{VarZeroVec, ZeroMap, 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 in u16
    let zv: ZeroVec<u16> = ZeroVec::parse_bytes(bytes).expect("valid u16 bytes");
    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);

    // 2. ZeroVec allocates owned vectors from native slices and converts to standard vectors
    let nums: &[u32] = &[100, 200, 300];
    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![100, 200, 300]);
    owned_zv.for_each_mut(|item| *item += 1);
    assert_eq!(owned_zv.to_vec(), vec![101, 201, 301]);

    // 3. VarZeroVec stores variable-length strings with zero-copy parsing from serialized bytes
    let strings: &[&str] = &["zero", "copy", "vector"];
    let vzv: VarZeroVec<str> = VarZeroVec::from(strings);
    assert_eq!(vzv.len(), 3);
    assert!(!vzv.is_empty());
    assert_eq!(vzv.get(0), Some("zero"));
    assert_eq!(vzv.get(1), Some("copy"));
    assert_eq!(vzv.get(2), Some("vector"));
    assert_eq!(vzv.get(3), None);

    let vzv_bytes = vzv.as_bytes();
    let vzv_parsed: VarZeroVec<str> = VarZeroVec::parse_bytes(vzv_bytes).expect("valid VarZeroVec bytes");
    assert_eq!(vzv_parsed.len(), 3);
    assert_eq!(vzv_parsed.get(1), Some("copy"));

    // 4. ZeroMap provides sorted key-value lookups over zero-copy backing stores
    let mut map: ZeroMap<u32, str> = ZeroMap::new();
    map.insert(&1, "first");
    map.insert(&2, "second");
    map.insert(&3, "third");
    assert_eq!(map.len(), 3);
    assert!(!map.is_empty());
    assert_eq!(map.get(&1), Some("first"));
    assert_eq!(map.get(&2), Some("second"));
    assert_eq!(map.get(&3), Some("third"));
    assert_eq!(map.get(&4), None);
    assert!(map.contains_key(&2));
    assert!(!map.contains_key(&4));

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