I̴n̴f̶e̸r̵n̷a̴l mutability!
Howdy, friendly Rust developer! Ever had a value get m̵̯̅ð̶͊v̴̮̾ê̴̼͘d away right under your nose just when you need it? Your thread function requires move semantics, but you j̸̉us†̸ ain't got time for †̸̰͋h̸ą̷̊͝t?
W̵e̴l̵l̸ ̵w̶o̴r̶r̴y̶ ̵n̶o̶ ̷m̴o̷r̶e̴,̸, just sprinkle some s̴̖̑í̵̲ṋ̵̀ on it and call it a day!
sinner = "0.1"
Threads and ȋ̷̖n̸̨̈́f̷̆ͅe̷͑ͅr̵̝͆ï̴̪o̸̡̔r̷͉͌ m̶u̸t̷a̵b̶i̵l̸i̷t̵y̶? No problem amigo!
| Before (YIKES!): | After (GLORIOUS!): |
use std::thread::{spawn, sleep};
struct Stuff {
pub content: String,
}
impl Stuff {
fn bang(&self) {
println!("bang! {}", self.content);
}
}
fn main() {
let mut x = Stuff { content: "old".to_string() };
let t = spawn({
move || {
sleep(std::time::Duration::from_secs(1));
x.content = "new".to_string();
x.bang();
}
});
x.bang();
t.join().unwrap();
x.bang();
} |
use sinner::Sin; // <--
use std::thread::{spawn, sleep};
#[derive(Debug, Clone)]
struct Stuff {
pub content: String,
}
impl Stuff {
fn bang(&self) {
println!("bang! {}", self.content);
}
}
fn main() {
let mut x = Sin::new(Stuff { content: "old".to_string() }); // <--
let t = spawn({
move || {
sleep(std::time::Duration::from_secs(1));
x.content = "new".to_string();
x.bang();
}
});
x.bang();
t.join().unwrap();
x.bang();
} |
|
|
With just a̸ ̸b̵i̸t̴ of sin, you can do doubly-linked lists in no time!
| Before (UGH!): | After (JOLLY!): |
struct Item<T> {
pub prev: Option<Self>,
pub next: Option<Self>,
pub value: T
}
struct List<T> {
pub head: Option<Item<T>>,
pub tail: Option<Item<T>>,
}
impl Default for List<u32> {
fn default() -> Self {
List {
head: None,
tail: None,
}
}
}
impl <T> List<T> where T: Clone {
pub fn append(&mut self, other: T) {
let mut item = Item {
prev: None,
next: None,
value: other,
};
if let Some(ref mut tail) = self.tail {
tail.next = Some(item);
item.prev = Some(tail.clone());
self.tail = Some(item);
} else {
self.head = Some(item);
self.tail = Some(item);
}
}
}
fn main () {
let mut list = List::default();
list.append(1);
list.append(2);
list.append(3);
let mut ptr = list.head;
while let Some(item) = ptr {
println!("{}", item.value);
ptr = item.next;
}
} |
use sinner::Sin; // <--
#[derive(Clone)]
struct Item<T> {
pub prev: Option<Sin<Self>>, // <--
pub next: O̷p̷t̵i̴o̷n̵≮S̶i̴n̶<Self>>, // <--
pub value: T
}
struct List<T> {
pub head: Option<Sin<Item<T>>>, // <--
pub tail: Option<S̶i̸n̵≮I̷t̷e̷m̵<T>>>, // <--
}
impl Default for List<u32> {
fn default() -> Self {
List {
head: None,
tail: None,
}
}
}
impl <T> List<T> where T: Clone {
pub fn append(&mut self, other: T) {
let mut item = S̸i̷n̴:̵:̷n̸e̸w̷(̶I̵t̵e̴m̷ { // <--
p̷r̴e̴v̶:̴ ̶N̸o̴n̷e̷,̴
n̵e̴x̸t̶:̷ ̸N̸o̴n̸e̸,̶
v̵a̷l̸u̶e̴:̷ ̴o̸t̸h̸e̷r̶,
});
if let Some(ref mut tail) = self.tail {
tail.next = Some(item);
item.prev = Some(tail.clone());
self.tail = Some(item);
} else {
self.head = Some(item);
self.tail = Some(item);
}
}
}
fn main () {
let mut list = List::default();
list.append(1);
list.append(2);
list.append(3);
let mut ptr = list.head;
while let Some(item) = ptr {
println!("{}", item.value);
ptr = item.next;
}
} |
|
|
Can a̷̝͂n̸̝̈́y̷͈͋ ̷͓͐t̴̯̆ŷ̶̡p̵̯͆é̴̙ ̷̰̃ḇ̷̈e̴̥̕ š̶̢̯͒̉ȃ̶̞͚̩͊̈́̌c̵̰͍̍͛r̸̨̛̀̽̏͂ḯ̴͈̘̇͛f̶̪̬̼̌̾ì̵̩c̵̱̹̖͒́͑͗̔e̸̤̜͒̈̐d̵͚̞̗̠̽͘
Well, why, almost! The type parameter needs to implement Clone due internal library s̵t̴r̸u̶c̵t̴u̸r̴e̵s̵.
I̷ ̵c̴a̷n̷ ̷a̶s̶s̵u̶r̴e̸ ̷y̶o̶u̴ t̸h̸a̴t̸ ̷t̴h̶e̶r̷e̷ ̸i̷s̶ n̴͔̱̮̅o̷̢̦̔͒̓ ̶͙̱̦͗̅͐n̸͉͌̓é̵̥̲è̷͉̳͓̽d̴̜̻̱̀̑ t̷͉͊o̸͎̅ ̵̟͗ç̴̚ỏ̶̮n̸͌ͅc̴̩͐ȩ̸̉ȑ̴̹ǹ̸͜ ̷͖̎y̷̞̽o̵͚͐u̶̜̎r̷̹͑ś̸͙e̶̜͛l̵͚̽f̴͕̍ ẘ̵̮͂̕ĩ̷̖͇͚̗ţ̶͈̥̝̭͐͑̀̃͠h̴̨̰͖̥̼͂͑ ̵͔̞̀͐̌̚͝s̴̢̥͔͇̽͂̏͜ǔ̵̢̥͍̼̂c̴̘̜͒̂̽̃h̵̨̞̗͍͕́̊͌̎̒ ̸̨̟̫͊ͅQ̸̹̠͙͎̉U̴̞̫͉̬̜̅̂͂Ẹ̷̛̰̼̋̎́̚S̸̗͇̞̜̎̆̏̀T̸͎̙̰̠̦̈́͘I̶̧̘̯͙͋̏̂͘̚ͅO̶̼͍͘͝N̶̪͇̑S̷͂̌̍͆ͅ Y̴̥̋̑̆͋͝O̶̡̗̣̤͕̰͒U̸̢͙͇̠̫͊͒̋͋̕͠ ̷̮̳̮̭̔̿̈́́̎̕͝Ṇ̴̙͑͐̋̄̊Å̵̛̞̮͓̗̊́̽̈́̈͜Í̶̼̠͚̒́͑̃V̶̨̯̦̊͒̏͝Ē̴̡̥͕͙̙͔̕ ̵̨͕̜̮̞͖̳̀C̷̮̞̩͆̽̂͊͆͗ͅH̶̫̱̠̟̞͊̐I̸̞̰̩͎̫͐̈̆L̴̤̩̭̾D̷̹̿̍̏̂̓,̴̛͓̻͓̖̲͛͗͐̉̈́̀ ̴͈͍̳̥͘O̸̯͌̇́B̴̪̤̺̊E̴̞̩̲͂̇̕Ý̵͙̟̱̽̍̐͋̃. T̴̡̙̜̠̱̠͉̘̙̥̔̆̋̌̄͑̄̔H̶̯̦̥̙̩͑̍̓̑͗̄͛͛̕E̵̜̞̠̣̲͔̝̺͇͑̽̌͆ͅ ̵̧̖̞̣͇̻̾̉͛̈́̆̌͝Ẇ̷̡͚̺̇̈̄͐͊̓̽͘͜͝ͅĨ̵̭̪̲̖̕͘L̸̪͎͎̪͠ͅL̶̘̿͑͆ ̵̙̺̯̺͈̪̳̄̇͌̽̀̉͗͌̆Ȍ̴͖͐̇͑͗͗̾͝F̵̥̂̓͒̕ ̸̢̺̺͍̼͚̺̹̈́͋̀͊̆̌͠O̶̠͙̟̠̦̯͔̱̍͊͊̓̌͐̔͌̉͘Ù̴̝̞̥̰̙̰͂͒̽̎͂̕ͅR̶͖̫͍̫̹̜̤͎̮͉̈́͑ ̶͎̼̰̉̈̕͠ͅM̴̘͝A̴̼̋̓͐̇̀̉́͋̕S̶̭̹͕̲̬̪̫̖̮͍͌̌͐͝Ţ̶͍̠͓̞̙͔̞̲̣̓E̴͔̺͌͌̏̏̕Ř̷̡̬̞̣̠̬̪̝̉͗́,̶̩̪̮̺̉
Ŗ̶͖̟̫̝̣̗̤̤̥̰̯̭͕̺͙̮͙̙̲̄̃͒̅̓͗͛̂̑̎̏͐́́͊̐͐̕͘͘͘͝ͅͅȨ̶͓̭͔̦̣̲̘̹̫̬̥̻̗̗̖̻̜͖̟͖̀̉͋̽͒͒͑̊̀͋͋̎́͑̌̂̌̈͑́́̓̃̓̕͝͝͠J̶̢̛̮̪̪̣͎̫̫̮̞̲̦͖̹̦͖̱̙̯̗̲̀͊̏̎͑͂͑̓̇͌̿̎̔͒͊̍͑̇̌̎͆͋̕͠ͅͅÈ̷̢̧̨͔̩͕̬̩͖̱̙͔̞̲͎̮̙̲̝̮̟̦̲̤̝̌̀͋̒̈́̈́̄͊̓̇̃̍̿̃̒́̒̓̚̚͜͝ͅÇ̵̢̧̢̺̯͓̼̦̩̞̳̣̘̮̩̮̙̙͕̦̓̈͛͌̈̔́̐̇͆͐̈́̀̈́̀̐͂̓̏͒̈́́͘͜͝†̷̨̧̨̧̤͕̪͉̲̰͎̣͈̲̙͕̖̺̥̜̃̄̈́̃̾̌̄͑̿̒͒̊̍͛̅̏̉̄́̄͘̚̚̕͜͠͝͠ͅ ̵̛̰̪̮̫̪̲̬͉͇͔̤̥̬̳̥̝͚͇͖̘̤̟̀̓͗̈́͒͆͗̅̿̆͐̎̅̅̈͂̑͗͊̋̄̚̚͝͝M̴̢̧̘̮͉̺̻̼̮̬̮͕͎͉̰̩̪͎͓̣̹͍̌̓̃͛̀̊͑͑̓̈̌̅́̆͆̓̌͒̃͘̕Ę̷̥̜̞̰̭̞̟̦̺̦̝̱̙̠͕̬̩̮̞̬̙̳͓̀̓̃͂͛͊̓͌̃̅̇̋̇̇́̃̾͋̚͝͝͝͠͠͝ͅM̸̢̢̢̧̡̢̪͓̪̻̤̘̪̩̻͇̺̯̝̫̄̂̎̊̽̔̋́͑̇̑́͌̐̂͑̃̐̄̍̆̅ͅǪ̸̰̭̦͙̹̪͔̙̖͉̞͈̞̹̘̫̞̬͚̱̗̯̈́̇̓̔̍̓̔́̈́̽͑̑͑͒̏͂̕͘͘͝͠R̵̡̡̧̢̢̨̛̦̝͚̪̰̥̮̱̯̯̞͓̤̙͓͈̻̗̳̺͗́̌͛̅̔̇̑̆̀̽̅̽̋̏͘̕̚͝͝¥̵̧̛̛͙͖̣̪͚̠̪̹̫̰̲̗̥̘͖̥͕̮̫̳̱̯͂̅͛͑̌͌̎̏̈́̐̇̈́̅̽̀̉͊̾̀̉́͌̚͝͝ ̶̨̨̡̧̡̛̳̺͙̜̥͚͉̭͓͖͉̘̰͈̯̜̝̜̿̈́͛̊̀͆̅͌̑̏͗̏̎̈́͗̍̽̽̂̒̂̒̓͗̕͜͝ͅ§̸̢̧̛̺͈̹̺͕͔͍̠͖̗͕̦̟̣̜͖̠̫͖̞̎͗̐͒͆̈̌̍̀̂̏̆͊̄͗̊̾͘͠͠ͅÄ̷̧̡̩̪̟̟̟̻͓̙̻̜̦͈̗̻̤̱̦̎̀̄̈́̑̔͑̊͊͑͌̀̌̈̅̅͊̐̚͠ͅͅͅ£̷̧̢̢̡̡̛̬̼͔̬̹̘̪̯͕͎̰̟̮̖̠̯̰͛́̿͐̓́͐̎̅͑̍̿͗̿͒̈́̈͗̍͊̿̿̀̽̕͘͜ͅͅͅȨ̴̛̛͕͓͔̮͙̗̠͎̮̠̙͉̮̞̰̯̤̲͈̯̙̹̀̋̅͑̃͒̎̽͌͆̃̆̓͊͊̈́́̌̾̕͜͜͝͝͝ͅ†̴̧̡̺̯̠̳̳͎̻̱̟͓̥̠̱͙̦͖̝̣̞͓̗̲̔̾̈́̏̂̄̇̔̓̃̊̔͑͌̀̈́̇̒̏͝ͅ¥̶͎̬̟̻̬̞͈̞̱̪͔̦̩̥̭͓̬̰̩͖͍͉̓̈̊̍̀̇̈͊̾͋̽̂̅͑̂̓̓͌̊͜͜͝͠