Created
January 20, 2020 16:38
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| use std::ops::Deref; | |
| use std::rc::Rc; | |
| #[derive(PartialEq, Debug, Clone)] | |
| struct Shoe { | |
| size: u32, | |
| style: String, | |
| } | |
| struct MyBox<T>(T); | |
| impl<T> MyBox<T> { | |
| fn new(t: T) -> MyBox<T> { | |
| MyBox(t) | |
| } | |
| } | |
| impl<T> Deref for MyBox<T> { | |
| type Target = T; | |
| fn deref(&self) -> &Self::Target { | |
| &self.0 | |
| } | |
| } | |
| fn select_size(shoes: &Vec<Shoe>, size: u32) -> Vec<&Shoe> { | |
| shoes | |
| .into_iter() | |
| .filter(|s| s.size == size) | |
| .collect::<Vec<&Shoe>>() | |
| } | |
| fn main() { | |
| let b = MyBox::new(19); | |
| println!("box: {}", *b); | |
| let mut a = Rc::new(10); | |
| let mut a3 = Rc::get_mut(&mut a).unwrap(); | |
| *a3 = 100; | |
| let a1 = Rc::clone(&a); | |
| let a2 = Rc::clone(&a); | |
| println!("Rc: {}, refs: {}", a1, Rc::strong_count(&a)); | |
| let v1 = vec![1, 2, 3]; | |
| let v2 = v1.iter().map(|n| n * *n).collect::<Vec<i32>>(); | |
| println!("{:?}", v2); | |
| println!( | |
| "{:?}", | |
| (1..=10) | |
| .collect::<Vec<u32>>() | |
| .iter() | |
| .fold(0, |acc, n| acc + *n) | |
| ); | |
| } | |
| #[cfg(test)] | |
| mod test { | |
| use super::*; | |
| #[test] | |
| fn filters_by_size() { | |
| let shoes = vec![ | |
| Shoe { | |
| size: 10, | |
| style: String::from("Allbirds"), | |
| }, | |
| Shoe { | |
| size: 13, | |
| style: String::from("Ultraboost"), | |
| }, | |
| ]; | |
| let in_my_size = select_size(&shoes, 10); | |
| println!("{:?}", in_my_size); | |
| assert_eq!( | |
| in_my_size, | |
| vec![&Shoe { | |
| size: 10, | |
| style: String::from("Allbirds") | |
| }] | |
| ); | |
| } | |
| } |
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