在Rust编译器的源代码中,rust/compiler/rustc_data_structures/src/snapshot_map/mod.rs文件的作用是实现了一个用于记录快照状态的HashMap数据结构。 该文件定义了两个主要的结构体:SnapshotMap和UndoLog。这两个结构体一起实现了一个键值对映射的数据结构,可以支持快照和撤销操作。 SnapshotMap结构体是一个哈希表...
1221 Split a String In.. Rust 1226 The Dining Philosophers C++ 1227 Airplane Seat Assignment Probability Rust 1232 Check If It Is a Straight Line Rust 1248 Count Number of Nice Subarrays Rust 1251🔒 Average Selling Price SQL 1252 Cells with Odd Values in a Matrix Rust ...
Key = one , Value = 1 Key = two , Value = 2 Key = dos , Value = 2 Key = deux , Value = 2 Key = three , Value = 3 Key = four , Value = 4 代码语言:javascript 复制 use itertools::Itertools; use std::collections::HashMap; fn main() { let mut mymap = HashMap::new(...
这个结构体使用一种自定义的哈希函数来为每个定义路径生成一个唯一的哈希值,然后将值存储在内部的hashmap中。这样做的好处是可以快速查找某个定义路径对应的值,而不需要遍历整个HashMap表。 在这个文件中,还定义了几个struct:Config,ItemKey和ItemValue。Config结构体用于存储与DefPathHashMap的配置相关的信息。ItemKey...
regression: a value of type `HashMap<Pulse, u64>` cannot be built from #135669 commented on Jan 23, 2025 • 0 new comments regression: cannot borrow ... as immutable because it is also borrowed as mutable #135671 commented on Jan 23, 2025 • 0 new comments Type inference iss...
// Check for a specific one. if !books.contains("The Winds of Winter") { println!("We have {} books, but The Winds of Winter ain't one.", books.len()); } // Remove a book. books.remove("The Odyssey"); // Iterate over everything. for book in &books { println!("{}", ...
use std::collections::HashMap; let mut scores = HashMap::new(); scores.insert(String::from("Blue"), 10); scores.insert(String::from("Yellow"), 50); let team_name = String::from("Blue"); let score = scores.get(&team_name); // 根据健找值 for (key, value) in &scores { pr...
DebugCountersState:该结构体用于存储和更新调试计数器的状态。它包含一个HashMap字段,用于存储每个计数器的当前值。 DebugCounter:该结构体定义了一个调试计数器。它包含一个id字段用于唯一标识计数器,并跟踪计数器的值。 GraphvizData:该结构体在调试期间用于生成 Graphviz 数据。它包含多个字段,例如节点列表和边列表,...
CREATE TABLE IF NOT EXISTS sessions (id SERIAL PRIMARY KEY,session_id VARCHAR NOT NULL UNIQUE,user_id INT NOT NULL UNIQUE); 迁移会自动运行。但如果大家想要手动操作,也可以使用 sqlx migrate run --database-url 。这种操作之所以可行,是因为我们已经将 SQL 文件设置为幂等,就是说只要已经存在该表、则...
use std::collections::HashMap; type PlayerID = i32; #[derive(Debug, Default)] struct Player { score: i32, } fn start_game(player_a: PlayerID, player_b: PlayerID, server: &mut HashMap<PlayerID, Player>) { // get players from server or create & insert new players if they don't...