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Rust 代码片段 Box<dyn Any>:
use std::any::Any;
fn print_if_string(s: Box<dyn Any>) {
if s.is::<String>() {
println!("It's a string...");
} else {
println!("Not a string...");
}
}
fn main() {
let new_string = "hello".to_string();
print_if_string(Box::new(new_string));
}
use std::any::Any;
fn print_if_string(s: Box<dyn Any>) {
if s.is::<String>() {
println!("It's a string...");
} else {
println!("Not a string...");
}
}
fn main() {
let new_string = "hello".to_string();
print_if_string(Box::new(new_string));
}
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Rust 代码片段 -- dyn Any:
use std::any::Any;
fn print_if_string(s: &dyn Any) {
if s.is::<String>() {
println!("It's a string!");
} else {
println!("Not a string!");
}
}
fn main() {
print_if_string(&"hello".to_string());
}
use std::any::Any;
fn print_if_string(s: &dyn Any) {
if s.is::<String>() {
println!("It's a string!");
} else {
println!("Not a string!");
}
}
fn main() {
print_if_string(&"hello".to_string());
}
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Rust 代码片段 -- 之 dyn Any(with TypeId):
use std::any::{Any, TypeId};
fn main() {
fn is_string(s: &dyn Any) {
if TypeId::of::<String>() == s.type_id() {
println!("It's a string!");
} else {
println!("Not a string!");
}
}
is_string(&"hello".to_string());
}
use std::any::{Any, TypeId};
fn main() {
fn is_string(s: &dyn Any) {
if TypeId::of::<String>() == s.type_id() {
println!("It's a string!");
} else {
println!("Not a string!");
}
}
is_string(&"hello".to_string());
}
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Rust 为 newtype 实现 Display
struct Meters(u32);
impl fmt::Display for Meters {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.0)
}
}
struct Meters(u32);
impl fmt::Display for Meters {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.0)
}
}
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使用create-react-app创建项目，别忘记支持typescript，状态管理mobx已经使用了n+1年了，请问还有比react-router更好用的路由管理么，sass也已经使用了n+1年了--没办法改变了，material-ui开始使用的时候大概还只是1.x。再配合bun+rsbuild，这应该是一个"值得纪念的时刻"，因为未来的技术并非可以更好...
10
6
use std::sync::mpsc;
use std::thread;
fn main() {
let (tx, rx) = mpsc::channel();
thread::spawn(move || {
let val = String::from("hi");
tx.send(val).unwrap();
});
let received = rx.recv().unwrap();
println!("Got: {received}");
}
use std::thread;
fn main() {
let (tx, rx) = mpsc::channel();
thread::spawn(move || {
let val = String::from("hi");
tx.send(val).unwrap();
});
let received = rx.recv().unwrap();
println!("Got: {received}");
}
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css 背景图片自适应居中:
background-image: url("__url__");
background-repeat: no-repeat;
background-size: cover;
background-position: center;
background-image: url("__url__");
background-repeat: no-repeat;
background-size: cover;
background-position: center;
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