update at 2020-06-21 19:00:26 by ehlxr
parent
939f409503
commit
26ab99279a
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@ -1,58 +1,6 @@
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# This file is automatically @generated by Cargo.
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# It is not intended for manual editing.
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[[package]]
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name = "hello_macro"
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version = "0.1.0"
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[[package]]
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name = "hello_macro_derive"
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version = "0.1.0"
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dependencies = [
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"quote 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
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"syn 0.14.9 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "proc-macro2"
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version = "0.4.30"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "quote"
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version = "0.6.13"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "rust_study"
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version = "0.1.0"
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dependencies = [
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"hello_macro 0.1.0",
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"hello_macro_derive 0.1.0",
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]
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[[package]]
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name = "syn"
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version = "0.14.9"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
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"quote 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
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"unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "unicode-xid"
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version = "0.1.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[metadata]
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"checksum proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)" = "cf3d2011ab5c909338f7887f4fc896d35932e29146c12c8d01da6b22a80ba759"
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"checksum quote 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)" = "6ce23b6b870e8f94f81fb0a363d65d86675884b34a09043c81e5562f11c1f8e1"
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"checksum syn 0.14.9 (registry+https://github.com/rust-lang/crates.io-index)" = "261ae9ecaa397c42b960649561949d69311f08eeaea86a65696e6e46517cf741"
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"checksum unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "fc72304796d0818e357ead4e000d19c9c174ab23dc11093ac919054d20a6a7fc"
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@ -5,5 +5,5 @@ authors = ["ehlxr <ehlxr.me@gmail.com>"]
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edition = "2018"
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[dependencies]
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hello_macro = { path = "../hello_macro" }
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hello_macro_derive = { path = "../hello_macro/hello_macro_derive" }
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# hello_macro = { path = "../hello_macro" }
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# hello_macro_derive = { path = "../hello_macro/hello_macro_derive" }
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113
src/main.rs
113
src/main.rs
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@ -409,7 +409,7 @@ fn main() {
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leaf.parent.borrow().upgrade(),
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);
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} // -> 离开作用域，此时，Rc<branch> 的强引用（strong_count）为 0，但是 Weak<branch> 弱引用数（weak_count）仍然为 1（引用 Weak<branch> 的 Rc<leaf> 仍然存在），
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// weak_count 无需计数为 0 就能使 Rc<branch> 实例被清理。
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// weak_count 无需计数为 0 就能使 Rc<branch> 实例被清理。
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println!(
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"leaf strong = {}, weak = {}, parent = {:?}",
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Rc::strong_count(&leaf),
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@ -917,13 +917,13 @@ fn main() {
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// ---------------------------
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println!("---------------------------");
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use hello_macro::HelloMacro;
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use hello_macro_derive::HelloMacro;
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// use hello_macro::HelloMacro;
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// use hello_macro_derive::HelloMacro;
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#[derive(HelloMacro)]
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struct Pancakes;
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// #[derive(HelloMacro)]
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// struct Pancakes;
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Pancakes::hello_macro();
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// Pancakes::hello_macro();
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let user1 = User {
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username: String::from("hllo"),
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@ -948,7 +948,7 @@ fn main() {
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let s1 = String::from("Hello, ");
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let s2 = String::from("World!");
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let s3 = s1 + &s2; // 注意 s1 被移动了，不能继续使用
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// println!("{} {} {}", s1, s3, s2);
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// println!("{} {} {}", s1, s3, s2);
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println!("{} {}", s3, s2);
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let hello = "测试中文字符串";
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@ -962,7 +962,86 @@ fn main() {
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println!("");
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// let s = hello[1]; // Rust 的字符串不支持索引
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// let s = &hello[0..4]; // thread 'main' panicked at 'byte index 4 is not a char boundary; it is inside '试' (bytes 3..6) of `测试中文字符串`', src/libcore/str/mod.rs:2219:5
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print!("{}", &hello[0..3]);
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println!("{}", &hello[0..3]);
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println!("--------------HashMap-----------");
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let mut scores = HashMap::new();
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scores.insert(String::from("Blue"), 10);
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scores.insert(String::from("Yellow"), 50);
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println!("{:?}", scores);
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for (k, v) in &scores {
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println!("k {}, v {}", k, v);
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}
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// 只在键没有对应值时插入
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// Entry 的 or_insert 方法在键对应的值存在时就返回这个值的 Entry ，
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// 如果不存在则将参数作为新值插入并返回修改过的 Entry
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let x3 = scores.entry("Blue".to_string()).or_insert(60);
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println!("{}", x3);
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let x2 = scores.entry("Red".to_string()).or_insert(55);
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println!("{}", x2);
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println!("{:?}", scores);
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let nms = vec![String::from("Blue"), String::from("Yellow")];
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let scs = vec![10, 50];
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let scores: HashMap<_, _> = nms.iter().zip(scs.iter()).collect();
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println!("{:?}", scores);
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let field_name = String::from("hello");
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let field_value = 456;
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let mut map1 = HashMap::new();
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map1.insert(field_name, field_value);
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// borrow of moved value: `field_name`
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// println!("{} {} {:?}", field_name, field_value, map1);
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println!("{} {:?}", field_value, map1);
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let k = &String::from("hello");
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let v = String::from("world");
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let mut map1 = HashMap::new();
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map1.insert(k, v);
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// borrow of moved value: `v`
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// println!("{} {} {:?}", k, v, map1);
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println!("{} {:?}", *k, map1);
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let option = map1.get(k);
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println!("{}", option.unwrap());
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let text = "hello world wonderful world";
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let mut map = HashMap::new();
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for tex in text.split_whitespace() {
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let counts = map.entry(tex).or_insert(0);
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*counts += 1;
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}
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println!("{:?}", map);
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println!("----------------错误处理-----------------");
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let fnames = "hello2.txt";
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let result = File::open(fnames);
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let file = match result {
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Ok(f) => f,
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// Err(e) => {
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// println!("Problem opening the file: {:?}", e);
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//
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// File::create(fnames).unwrap()
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// }
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Err(e) => match e.kind() {
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ErrorKind::NotFound => {
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match File::create(fnames) {
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Ok(f) => f,
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Err(e) => panic!("Problem creating the file: {:?}", e),
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}
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}
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oe => panic!("Problem opening the file: {:?}", oe),
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}
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};
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println!("{:?}", file);
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println!("----------------match 匹配 枚举------------------");
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let m = Message::Quit;
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match m {
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Message::Write(s) => println!("{}", s),
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abc => println!("{:?}", abc),
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}
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}
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fn test_tuple(t: (i32, &str)) {
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@ -1268,9 +1347,9 @@ impl ToString for Tweet {
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//}
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fn notify<T, U>(t: &T, u: &U) -> String
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where
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T: Summary + ToString,
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U: Summary,
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where
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T: Summary + ToString,
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U: Summary,
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{
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format!("{}, {}", u.summarize(), t.to_string())
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}
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@ -1338,18 +1417,18 @@ fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
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}
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struct Cacher<T, D, F>
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where
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T: Fn(&D) -> F,
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where
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T: Fn(&D) -> F,
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{
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calculation: T,
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value: HashMap<D, F>,
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}
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impl<T, D, F> Cacher<T, D, F>
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where
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D: Hash + Eq,
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F: Copy,
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T: Fn(&D) -> F,
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where
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D: Hash + Eq,
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F: Copy,
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T: Fn(&D) -> F,
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{
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fn new(calculation: T) -> Cacher<T, D, F> {
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Self {
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