use std::collections::HashMap;fn main() {let mut map: HashMap = HashMap::new();map.insert(1, "apple");map.insert(2, "banana");map.insert(3, "orange");let mut drained: Vec<(u32, &str)> = Vec::new();map.retain(|key, value| {if key % 2 == 0 {drained.push((*key, ...
let led = LED.get_or_insert_with(|| { cortex_m::interrupt::free(|cs| { G_LED.borrow(cs).replace(None).unwrap() }) }); let tim = TIM.get_or_insert_with(|| { cortex_m::interrupt::free(|cs| { G_TIM.borrow(cs).replace(None).unwrap() }) }); let temp = cortex_m::int...
ReadResult::Timeout => { async_send_render_to_screen(bytes).await; render_deadline = None; } ReadResult::Ok(n_bytes) => { let bytes = &buf[..n_bytes]; async_send_data_to_screen(bytes).await; render_deadline.get_or_insert(Instant::now() + render_pause); } } } } }) 复制...
map_fruit.insert("Lemon".to_string(), 66); map_fruit.insert("Apple".to_string(), 99); // 访问存在的键 if let Some(value) = map_fruit.get_mut("Apple") { *value = 100; } else { println!("not found"); } // 输出:{"Apple": 100, "Lemon": 66} println!("{:?}", map_...
insert、remove、get等方法:用于对哈希表执行增加、删除和获取操作。 UndoLog枚举类型定义了用于记录每个操作的日志。该枚举类型包含以下变体: Insert { key: K, value: V }:插入操作的日志记录。 Remove { key: K }:删除操作的日志记录。 这些日志记录在stack字段中按照执行顺序保存,以便在需要时可以回滚到之前...
(user_id) DO UPDATE SET session_id = EXCLUDED.session_id") .bind(&session_id) .bind(res.get::<i32, _>("id")) .execute(&state.postgres) .await .expect("Couldn't insert session :("); let cookie = Cookie::build("foo", session_id) .secure(true) .same_...
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.insert(header::SERVER, HeaderValue::from_static("Salvo")); } 然后将它添加到路由中: Router::new().hoop(add_header).get(hello) 这就是一个简单的中间件,它向Response的头部添加了Header, 查看完整源码。 可链式书写的树状路由系统 正常情况下我们是这样写路由的: ...
(builder, merge_block); let else_block = llvm::core::LLVMGetInsertBlock(builder); // Insert the phi node llvm::core::LLVMPositionBuilderAtEnd(builder, merge_block); let phi_name = CString::new("iftmp").unwrap(); let phi = llvm::core::LLVMBuildPhi(builder, int_type, phi_name.as...
let visits: usize = session.get("visits").unwrap_or_default(); session.insert("visits", visits + 1).unwrap(); request }, )); // 定义了一个处理根路径的GET请求的路由。这个路由通过 async move 来处理请求,获取会话中的访问计数,并返回一个包含访问次数的字符串。