81 lines
1.7 KiB
Rust
81 lines
1.7 KiB
Rust
use std::cell::{Cell, RefCell};
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use std::rc::Rc;
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use std::sync::Arc;
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use std::fmt::Debug;
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fn rc_refcell() {
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let r = Rc::new(RefCell::new(42));
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let r2 = r.clone();
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*r.borrow_mut() += 10;
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let x = *r2.borrow();
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assert_eq!(x, 52);
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}
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fn rc_cell() {
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let r = Rc::new(Cell::new(42));
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let r2 = r.clone();
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let x = r.get();
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r2.set(x + x);
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assert_eq!(r.get(), 84);
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}
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fn rc_refcell2() {
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let r = Rc::new(RefCell::new(42));
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let r2 = r.clone();
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*r.borrow_mut() += 10;
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let x = r2.borrow();
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let r3 = r.clone();
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let y = r3.borrow();
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assert_eq!((*x + *y)/2, 52);
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}
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fn rc_raw() {
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let r = Rc::new(0);
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let r2 = Rc::into_raw(r.clone());
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let r2 = unsafe { Rc::from_raw(r2) };
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assert!(Rc::ptr_eq(&r, &r2));
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drop(r);
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assert!(Rc::try_unwrap(r2).is_ok());
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}
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fn arc() {
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fn test() -> Arc<i32> {
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let a = Arc::new(42);
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a
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}
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assert_eq!(*test(), 42);
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}
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// Make sure this Rc doesn't fall apart when touched
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fn check_unique_rc<T: ?Sized>(mut r: Rc<T>) {
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let r2 = r.clone();
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assert!(Rc::get_mut(&mut r).is_none());
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drop(r2);
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assert!(Rc::get_mut(&mut r).is_some());
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}
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fn rc_from() {
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check_unique_rc::<[_]>(Rc::from(&[1,2,3] as &[_]));
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check_unique_rc::<[_]>(Rc::from(vec![1,2,3]));
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check_unique_rc::<[_]>(Rc::from(Box::new([1,2,3]) as Box<[_]>));
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check_unique_rc::<str>(Rc::from("Hello, World!"));
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}
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fn rc_fat_ptr_eq() {
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let p = Rc::new(1) as Rc<Debug>;
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let a: *const Debug = &*p;
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let r = Rc::into_raw(p);
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assert!(a == r);
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drop(unsafe { Rc::from_raw(r) });
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}
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fn main() {
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rc_fat_ptr_eq();
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rc_refcell();
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rc_refcell2();
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rc_cell();
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rc_raw();
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rc_from();
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arc();
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}
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