diff --git a/Cargo.lock b/Cargo.lock index f055335..a452459 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -1,58 +1,6 @@ # This file is automatically @generated by Cargo. # It is not intended for manual editing. -[[package]] -name = "hello_macro" -version = "0.1.0" - -[[package]] -name = "hello_macro_derive" -version = "0.1.0" -dependencies = [ - "quote 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)", - "syn 0.14.9 (registry+https://github.com/rust-lang/crates.io-index)", -] - -[[package]] -name = "proc-macro2" -version = "0.4.30" -source = "registry+https://github.com/rust-lang/crates.io-index" -dependencies = [ - "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)", -] - -[[package]] -name = "quote" -version = "0.6.13" -source = "registry+https://github.com/rust-lang/crates.io-index" -dependencies = [ - "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)", -] - [[package]] name = "rust_study" version = "0.1.0" -dependencies = [ - "hello_macro 0.1.0", - "hello_macro_derive 0.1.0", -] -[[package]] -name = "syn" -version = "0.14.9" -source = "registry+https://github.com/rust-lang/crates.io-index" -dependencies = [ - "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)", - "quote 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)", - "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)", -] - -[[package]] -name = "unicode-xid" -version = "0.1.0" -source = "registry+https://github.com/rust-lang/crates.io-index" - -[metadata] -"checksum proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)" = "cf3d2011ab5c909338f7887f4fc896d35932e29146c12c8d01da6b22a80ba759" -"checksum quote 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)" = "6ce23b6b870e8f94f81fb0a363d65d86675884b34a09043c81e5562f11c1f8e1" -"checksum syn 0.14.9 (registry+https://github.com/rust-lang/crates.io-index)" = "261ae9ecaa397c42b960649561949d69311f08eeaea86a65696e6e46517cf741" -"checksum unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "fc72304796d0818e357ead4e000d19c9c174ab23dc11093ac919054d20a6a7fc" diff --git a/Cargo.toml b/Cargo.toml index d35a953..4339955 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -5,5 +5,5 @@ authors = ["ehlxr "] edition = "2018" [dependencies] -hello_macro = { path = "../hello_macro" } -hello_macro_derive = { path = "../hello_macro/hello_macro_derive" } \ No newline at end of file +# hello_macro = { path = "../hello_macro" } +# hello_macro_derive = { path = "../hello_macro/hello_macro_derive" } \ No newline at end of file diff --git a/hello.txt b/hello.txt index ab66e28..e69de29 100644 --- a/hello.txt +++ b/hello.txt @@ -1 +0,0 @@ -ehlxr \ No newline at end of file diff --git a/hello2.txt b/hello2.txt new file mode 100644 index 0000000..e69de29 diff --git a/src/main.rs b/src/main.rs index 3cb063a..b506cf3 100644 --- a/src/main.rs +++ b/src/main.rs @@ -409,7 +409,7 @@ fn main() { leaf.parent.borrow().upgrade(), ); } // -> 离开作用域，此时，Rc 的强引用（strong_count）为 0，但是 Weak 弱引用数（weak_count）仍然为 1（引用 Weak 的 Rc 仍然存在）， - // weak_count 无需计数为 0 就能使 Rc 实例被清理。 + // weak_count 无需计数为 0 就能使 Rc 实例被清理。 println!( "leaf strong = {}, weak = {}, parent = {:?}", Rc::strong_count(&leaf), @@ -917,13 +917,13 @@ fn main() { // --------------------------- println!("---------------------------"); - use hello_macro::HelloMacro; - use hello_macro_derive::HelloMacro; + // use hello_macro::HelloMacro; + // use hello_macro_derive::HelloMacro; - #[derive(HelloMacro)] - struct Pancakes; + // #[derive(HelloMacro)] + // struct Pancakes; - Pancakes::hello_macro(); + // Pancakes::hello_macro(); let user1 = User { username: String::from("hllo"), @@ -948,7 +948,7 @@ fn main() { let s1 = String::from("Hello, "); let s2 = String::from("World!"); let s3 = s1 + &s2; // 注意 s1 被移动了，不能继续使用 - // println!("{} {} {}", s1, s3, s2); + // println!("{} {} {}", s1, s3, s2); println!("{} {}", s3, s2); let hello = "测试中文字符串"; @@ -962,7 +962,86 @@ fn main() { println!(""); // let s = hello[1]; // Rust 的字符串不支持索引 // 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 - print!("{}", &hello[0..3]); + println!("{}", &hello[0..3]); + + println!("--------------HashMap-----------"); + + let mut scores = HashMap::new(); + scores.insert(String::from("Blue"), 10); + scores.insert(String::from("Yellow"), 50); + println!("{:?}", scores); + for (k, v) in &scores { + println!("k {}, v {}", k, v); + } + // 只在键没有对应值时插入 + // Entry 的 or_insert 方法在键对应的值存在时就返回这个值的 Entry ， + // 如果不存在则将参数作为新值插入并返回修改过的 Entry + let x3 = scores.entry("Blue".to_string()).or_insert(60); + println!("{}", x3); + let x2 = scores.entry("Red".to_string()).or_insert(55); + println!("{}", x2); + println!("{:?}", scores); + + let nms = vec![String::from("Blue"), String::from("Yellow")]; + let scs = vec![10, 50]; + let scores: HashMap<_, _> = nms.iter().zip(scs.iter()).collect(); + println!("{:?}", scores); + + let field_name = String::from("hello"); + let field_value = 456; + let mut map1 = HashMap::new(); + map1.insert(field_name, field_value); + // borrow of moved value: `field_name` + // println!("{} {} {:?}", field_name, field_value, map1); + println!("{} {:?}", field_value, map1); + + let k = &String::from("hello"); + let v = String::from("world"); + let mut map1 = HashMap::new(); + map1.insert(k, v); + // borrow of moved value: `v` + // println!("{} {} {:?}", k, v, map1); + println!("{} {:?}", *k, map1); + + let option = map1.get(k); + println!("{}", option.unwrap()); + + let text = "hello world wonderful world"; + let mut map = HashMap::new(); + for tex in text.split_whitespace() { + let counts = map.entry(tex).or_insert(0); + *counts += 1; + } + println!("{:?}", map); + + println!("----------------错误处理-----------------"); + let fnames = "hello2.txt"; + let result = File::open(fnames); + let file = match result { + Ok(f) => f, + // Err(e) => { + // println!("Problem opening the file: {:?}", e); + // + // File::create(fnames).unwrap() + // } + Err(e) => match e.kind() { + ErrorKind::NotFound => { + match File::create(fnames) { + Ok(f) => f, + Err(e) => panic!("Problem creating the file: {:?}", e), + } + } + oe => panic!("Problem opening the file: {:?}", oe), + } + }; + println!("{:?}", file); + + println!("----------------match 匹配 枚举------------------"); + let m = Message::Quit; + match m { + Message::Write(s) => println!("{}", s), + abc => println!("{:?}", abc), + } } fn test_tuple(t: (i32, &str)) { @@ -1268,9 +1347,9 @@ impl ToString for Tweet { //} fn notify(t: &T, u: &U) -> String -where - T: Summary + ToString, - U: Summary, + where + T: Summary + ToString, + U: Summary, { format!("{}, {}", u.summarize(), t.to_string()) } @@ -1338,18 +1417,18 @@ fn longest<'a>(x: &'a str, y: &'a str) -> &'a str { } struct Cacher -where - T: Fn(&D) -> F, + where + T: Fn(&D) -> F, { calculation: T, value: HashMap, } impl Cacher -where - D: Hash + Eq, - F: Copy, - T: Fn(&D) -> F, + where + D: Hash + Eq, + F: Copy, + T: Fn(&D) -> F, { fn new(calculation: T) -> Cacher { Self {