Ejercicios 82/94
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@ -18,19 +18,17 @@
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// where the second TODO comment is. Try not to create any copies of the `numbers` Vec!
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// Execute `rustlings hint arc1` or use the `hint` watch subcommand for a hint.
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// I AM NOT DONE
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#![forbid(unused_imports)] // Do not change this, (or the next) line.
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use std::sync::Arc;
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use std::thread;
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fn main() {
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let numbers: Vec<_> = (0..100u32).collect();
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let shared_numbers = // TODO
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let shared_numbers = Arc::new(numbers);
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let mut joinhandles = Vec::new();
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for offset in 0..8 {
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let child_numbers = // TODO
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let child_numbers = Arc::clone(&shared_numbers);
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joinhandles.push(thread::spawn(move || {
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let sum: u32 = child_numbers.iter().filter(|n| *n % 8 == offset).sum();
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println!("Sum of offset {} is {}", offset, sum);
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@ -16,11 +16,9 @@
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//
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// Execute `rustlings hint box1` or use the `hint` watch subcommand for a hint.
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// I AM NOT DONE
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#[derive(PartialEq, Debug)]
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pub enum List {
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Cons(i32, List),
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Cons(i32, Box<List>),
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Nil,
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}
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@ -33,11 +31,11 @@ fn main() {
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}
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pub fn create_empty_list() -> List {
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todo!()
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List::Nil
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}
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pub fn create_non_empty_list() -> List {
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todo!()
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List::Cons(1, Box::new(List::Cons(2, Box::new(List::Nil))))
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}
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#[cfg(test)]
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@ -5,8 +5,6 @@
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// It can enclose and provide immutable access to borrowed data, and clone the data lazily when mutation or ownership is required.
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// The type is designed to work with general borrowed data via the Borrow trait.
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// I AM NOT DONE
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use std::borrow::Cow;
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fn abs_all<'a, 'b>(input: &'a mut Cow<'b, [i32]>) -> &'a mut Cow<'b, [i32]> {
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@ -41,8 +39,7 @@ fn main() {
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let slice = vec![-1, 0, 1];
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let mut input = Cow::from(slice);
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match abs_all(&mut input) {
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// TODO
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Cow::Borrowed(_) => println!("I own this slice!"),
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Cow::Owned(_) => println!("I own this slice!"),
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_ => panic!("expected borrowed value"),
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}
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}
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@ -5,8 +5,6 @@
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// Make this code compile by using the proper Rc primitives to express that the sun has multiple owners.
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// I AM NOT DONE
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use std::rc::Rc;
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#[derive(Debug)]
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@ -54,18 +52,15 @@ fn main() {
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println!("reference count = {}", Rc::strong_count(&sun)); // 6 references
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jupiter.details();
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// TODO
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let saturn = Planet::Saturn(Rc::new(Sun {}));
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let saturn = Planet::Saturn(Rc::clone(&sun));
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println!("reference count = {}", Rc::strong_count(&sun)); // 7 references
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saturn.details();
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// TODO
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let uranus = Planet::Uranus(Rc::new(Sun {}));
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let uranus = Planet::Uranus(Rc::clone(&sun));
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println!("reference count = {}", Rc::strong_count(&sun)); // 8 references
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uranus.details();
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// TODO
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let neptune = Planet::Neptune(Rc::new(Sun {}));
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let neptune = Planet::Neptune(Rc::clone(&sun));
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println!("reference count = {}", Rc::strong_count(&sun)); // 9 references
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neptune.details();
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@ -86,13 +81,13 @@ fn main() {
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drop(mars);
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println!("reference count = {}", Rc::strong_count(&sun)); // 4 references
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// TODO
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drop(earth);
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println!("reference count = {}", Rc::strong_count(&sun)); // 3 references
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// TODO
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drop(venus);
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println!("reference count = {}", Rc::strong_count(&sun)); // 2 references
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// TODO
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drop(mercury);
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println!("reference count = {}", Rc::strong_count(&sun)); // 1 reference
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assert_eq!(Rc::strong_count(&sun), 1);
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