{"id":15579017,"url":"https://github.com/dapper91/rankmap","last_synced_at":"2025-03-29T07:44:32.295Z","repository":{"id":197228984,"uuid":"695855790","full_name":"dapper91/rankmap","owner":"dapper91","description":"Rust hash table supporting key 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Status][test-badge]][test-url]\n[![Documentation][doc-badge]][doc-url]\n\n[crates-badge]: https://img.shields.io/crates/v/rankmap.svg\n[crates-url]: https://crates.io/crates/rankmap\n[licence-badge]: https://img.shields.io/badge/license-Unlicense-blue.svg\n[licence-url]: https://github.com/dapper91/rankmap/blob/master/LICENSE\n[test-badge]: https://github.com/dapper91/rankmap/actions/workflows/test.yml/badge.svg?branch=master\n[test-url]: https://github.com/dapper91/rankmap/actions/workflows/test.yml\n[doc-badge]: https://docs.rs/rankmap/badge.svg\n[doc-url]: https://docs.rs/rankmap\n\n# rankmap\n\nRanked hash table.\n\nA [hash-table](https://en.wikipedia.org/wiki/Hash_table) / [binary-heap](https://en.wikipedia.org/wiki/Binary_heap) \ncombined data structure that supports the following operations:\n\n# Time complexity\n| [Description]                | [Operation]  | [Complexity] |\n|------------------------------|--------------|--------------|\n| get value by key             | get          | *O*(1)~      |\n| check key existence          | contains_key | *O*(1)~      |\n| pop element with lowest rank | pop          | *O*(log(N))  |\n| get element with lowest rank | top          | *O*(1)       |\n| insert element with rank     | insert       | *O*(log(N))  |\n| remove element               | remove       | *O*(log(N))  |\n\n```rust\nuse std::thread;\nuse std::time::{Duration, Instant};\n\nuse rankmap::RankMap;\n\nfn task1() {\n    println!(\"task1 finished\")\n}\n\nfn task2() {\n    println!(\"task2 finished\")\n}\n\nfn task3() {\n    println!(\"task3 finished\")\n}\n\nfn main() {\n    let mut scheduler: RankMap\u003c\u0026str, Box\u003cdyn Fn()\u003e, Instant\u003e = RankMap::new();\n\n    let tank_id = \"task1\";\n    let task = Box::new(task1);\n    let run_at = Instant::now() + Duration::from_secs(1);\n    scheduler.insert(tank_id, task, run_at);\n\n    let tank_id = \"task2\";\n    let task = Box::new(task2);\n    let run_at = Instant::now() + Duration::from_secs(2);\n    scheduler.insert(tank_id, task, run_at);\n\n    while let Some((task_name, task, run_at)) = scheduler.pop() {\n        let backoff = run_at - Instant::now();\n        thread::sleep(backoff);\n        println!(\"executing {}\", task_name);\n        task();\n    }\n\n    let tank_id = \"task3\";\n    let task = Box::new(task3);\n    let run_at = Instant::now() + Duration::from_secs(1);\n    scheduler.insert(tank_id, task, run_at);\n\n    if let Some((task, run_at)) = scheduler.remove(\u0026\"task3\") {\n        println!(\"task3 cancelled\");\n    }\n\n    assert!(scheduler.top().is_none());\n}\n```\n\nSee [documentation](https://docs.rs/rankmap) for more 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