update at 2020-06-21 19:00:26 by ehlxr
This commit is contained in:
parent
939f409503
commit
26ab99279a
52
Cargo.lock
generated
52
Cargo.lock
generated
@ -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"
|
||||
|
||||
@ -5,5 +5,5 @@ authors = ["ehlxr <ehlxr.me@gmail.com>"]
|
||||
edition = "2018"
|
||||
|
||||
[dependencies]
|
||||
hello_macro = { path = "../hello_macro" }
|
||||
hello_macro_derive = { path = "../hello_macro/hello_macro_derive" }
|
||||
# hello_macro = { path = "../hello_macro" }
|
||||
# hello_macro_derive = { path = "../hello_macro/hello_macro_derive" }
|
||||
0
hello2.txt
Normal file
0
hello2.txt
Normal file
113
src/main.rs
113
src/main.rs
@ -409,7 +409,7 @@ fn main() {
|
||||
leaf.parent.borrow().upgrade(),
|
||||
);
|
||||
} // -> 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），
|
||||
// weak_count 无需计数为 0 就能使 Rc<branch> 实例被清理。
|
||||
// weak_count 无需计数为 0 就能使 Rc<branch> 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, U>(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<T, D, F>
|
||||
where
|
||||
T: Fn(&D) -> F,
|
||||
where
|
||||
T: Fn(&D) -> F,
|
||||
{
|
||||
calculation: T,
|
||||
value: HashMap<D, F>,
|
||||
}
|
||||
|
||||
impl<T, D, F> Cacher<T, D, F>
|
||||
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<T, D, F> {
|
||||
Self {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user