zerovec 0.11.6: zerovec::ZeroMap

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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::ZeroMap 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::ZeroMap

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.
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  - Keep it under 200 files and 256KB packed.

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  "kind": "HOW",
  "packages": [
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  "symbols": [
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//! Clean-room verification sample for zerovec.

pub use zerovec::*;

use zerovec::ule::AsULE;
use zerovec::ZeroMap;

fn main() {
    // 1. ZeroMap::new creates an empty map with len 0 and is_empty true
    let mut map: ZeroMap<u32, str> = ZeroMap::new();
    assert!(map.is_empty());
    assert_eq!(map.len(), 0);

    // 2. ZeroMap::insert inserts key-value pairs maintaining binary-searchable sorted order
    assert_eq!(map.insert(&10, "ten"), None);
    assert_eq!(map.insert(&30, "thirty"), None);
    assert_eq!(map.insert(&20, "twenty"), None);
    assert_eq!(map.len(), 3);
    assert!(!map.is_empty());
    let entries: Vec<(u32, &str)> = map.iter().map(|(k, v)| (u32::from_unaligned(*k), v)).collect();
    assert_eq!(entries, vec![(10, "ten"), (20, "twenty"), (30, "thirty")]);

    // 3. ZeroMap::get retrieves values for existing keys and returns None for missing keys
    assert_eq!(map.get(&10), Some("ten"));
    assert_eq!(map.get(&20), Some("twenty"));
    assert_eq!(map.get(&30), Some("thirty"));
    assert_eq!(map.get(&40), None);

    // 4. ZeroMap::contains_key accurately reports key membership
    assert!(map.contains_key(&10));
    assert!(map.contains_key(&20));
    assert!(map.contains_key(&30));
    assert!(!map.contains_key(&40));

    // 5. ZeroMap::remove removes existing key-value pairs and returns previous value
    let removed = map.remove(&20);
    assert_eq!(removed.as_deref(), Some("twenty"));
    assert_eq!(map.len(), 2);
    assert_eq!(map.get(&20), None);
    assert!(!map.contains_key(&20));

    // 6. ZeroMap::try_append appends strictly increasing keys and rejects out-of-order keys
    let mut append_map: ZeroMap<u32, str> = ZeroMap::new();
    assert!(append_map.try_append(&1, "one").is_none());
    assert!(append_map.try_append(&5, "five").is_none());
    assert!(append_map.try_append(&5, "duplicate").is_some());
    assert!(append_map.try_append(&2, "two").is_some());
    assert_eq!(append_map.len(), 2);
    assert_eq!(append_map.get(&1), Some("one"));
    assert_eq!(append_map.get(&5), Some("five"));
    assert_eq!(append_map.get(&2), None);

    // 7. ZeroMap::get_copied retrieves copied primitive values for fixed-size types
    let mut copied_map: ZeroMap<u32, u64> = ZeroMap::new();
    copied_map.insert(&1, &100);
    copied_map.insert(&2, &200);
    assert_eq!(copied_map.get_copied(&1), Some(100));
    assert_eq!(copied_map.get_copied(&2), Some(200));
    assert_eq!(copied_map.get_copied(&3), None);

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