mirror of https://github.com/rust-lang/book
25 lines
519 B
Rust
25 lines
519 B
Rust
#[derive(Debug)]
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enum List {
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Cons(Rc<RefCell<i32>>, Rc<List>),
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Nil,
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}
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use crate::List::{Cons, Nil};
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use std::cell::RefCell;
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use std::rc::Rc;
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fn main() {
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let value = Rc::new(RefCell::new(5));
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let a = Rc::new(Cons(Rc::clone(&value), Rc::new(Nil)));
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let b = Cons(Rc::new(RefCell::new(3)), Rc::clone(&a));
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let c = Cons(Rc::new(RefCell::new(4)), Rc::clone(&a));
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*value.borrow_mut() += 10;
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println!("a after = {a:?}");
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println!("b after = {b:?}");
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println!("c after = {c:?}");
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}
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