[Rust] Circular Reference (순환 참조) 예제 (40일차)
use std::rc::Rc; use std::cell::RefCell; use List::{Cons, Nil}; #[derive(Debug)] enum List { Cons(i32, RefCell), Nil, } impl List { fn tail(&self) -> Option { match *self { Cons(_, ref item) => Some(item), Nil => None, } } } fn main() { let a = Rc::new(Cons(5, RefCell::new(Rc::new(Nil)))); println!("a initial rc count = {}", Rc::strong_count(&a)); println!("a next item = {:?}", a.tail()); let b ..
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