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Study56

[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 .. 2023. 1. 23.
[Rust] RefCell 예제 (39일차) #[derive(Debug)] enum List { Cons(Rc, Rc), Nil, } use List::{Cons, Nil}; use std::rc::Rc; use std::cell::RefCell; fn main() { let value = Rc::new(RefCell::new(5)); let a = Rc::new(Cons(Rc::clone(&value), Rc::new(Nil))); let b = Cons(Rc::new(RefCell::new(6)), Rc::clone(&a)); let c = Cons(Rc::new(RefCell::new(10)), Rc::clone(&a)); *value.borrow_mut() += 10; println!("a after = {:?}", a); println!(.. 2023. 1. 22.
[Rust] Rc<T> 참조 카운팅 스마트 포인터 예제 (38일자) enum List { Cons(i32, Rc), Nil, } use List::{Cons, Nil}; use std::rc::Rc; fn main() { let a = Rc::new(Cons(5, Rc::new(Cons(10, Rc::new(Nil))))); println!("count after creating a = {}", Rc::strong_count(&a)); let b = Cons(3, Rc::clone(&a)); println!("count after creating b = {}", Rc::strong_count(&a)); { let c = Cons(4, Rc::clone(&a)); println!("count after creating c = {}", Rc::strong_count(&a)).. 2023. 1. 21.
[Rust] Ownership(소유권) 기초 예제 : &str (37일차) [예제 코드_1] fn main() { let name: &'static str = "Rust"; do_something(name); do_something(name); } fn do_something(name: &str) { println!("Hello, {:?}!", name); } [실행 결과] Hello, Rust! Hello, Rust! [예제 코드_2] fn main() { let name: &'static str = "Rust"; do_something(name.clone()); do_something(name.clone()); } fn do_something(name: &str) { println!("Hello, {:?}!", name); } [실행 결과] Hello, Rust! Hello.. 2023. 1. 20.

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