// https://youerning.top/post/rust-text-processing-tutorial/ use std::collections::HashMap; use std::io::BufRead; use std::io::BufReader; use std::io::Result; use std::fs::File; use serde_json::Value; fn main() -> Result<()>{ let filepath = "caddy.log"; let file = Fi...
We create an empty HashMap usingHashMap::new(). Themutkeyword makes the HashMap mutable, allowing us to add key-value pairs later. scores.insert(String::from("Blue"), 10); scores.insert(String::from("Yellow"), 50); We insert key-value pairs into the HashMap using theinsertmethod. ...
jar: PrivateCookieJar) -> Result<PrivateCookieJar, StatusCode> { let Some(cookie) = jar.get("foo").map(|cookie| cookie.value().to_owned()) else { return Ok(jar) }; let query = sqlx::query("DELETE FROM sessions WHERE session_id = $1") .bind(cookie) .execute(...
struct S { map: HashMap<i64, String>, def: String }impl S {fn ensure_has_entry(&mut self, key: i64) {// Doesn't compile with Rust 2018:self.map.entry(key).or_insert_with(|| self.def.clone());// | --- --- ^^ --- second borrow occurs...// | | | ...
CREATE TABLE IF NOT EXISTS {} ( id BIGINT NOT NULL , name VARCHAR(128) NOT NULL, gender TINYINT NOT NULL, mobile VARCHAR(11) NOT NULL, create_time DATETIME NOT NULL, update_time DATETIME NOT NULL, PRIMARY KEY(id) ) ENGINE=InnoDB DEFAULT CHARSET=utf8;", ...
struct S { map: HashMap<i64, String>, def: String } impl S { fn ensure_has_entry(&mut self, key: i64) { // Doesn't compile with Rust 2018: self.map.entry(key).or_insert_with(|| self.def.clone()); // | --- --- ^^ --- second borrow occurs... // | | | | //...
File::open(path)?.read_to_string(&muts)?;println!("{}",s);// 再整DesignErrorif*m.get(&k).unwrap()==ov{ m.insert(k,nv); }else{returnOk(Err(DesignError{ov,nv})) };Ok(Ok(())) }fnuse_wrapper(m: &mutHashMap<i32,i32>,k:i32,ov:i32,nv:i32,path: &str)->Result<(),Un...
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pub struct InMemoryIndex { pub word_count: usize, pub terms: HashMap<String, Vec<Hit>>, pub docs: HashMap<usize, Document>, } pub struct Document { pub id: u32, pub path: PathBuf, } pub type Hit = Vec<u8>; Document: 文档封装。 id: 文档 id,唯一标识符。 path: 源文件路径。
insert(k,nv); }else { return Ok(Err(DesignError{ov,nv})) }; Ok(Ok(())) } fn use_wrapper(m: &mut HashMap<i32, i32>, k: i32, ov: i32, nv: i32, path: &str)->Result<(),UnExpectedError> { match maybe_err(m,k,ov,nv,path)? { Ok(())=>println!("{}","...