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-rw-r--r--compiler/rustc_data_structures/src/owning_ref/tests.rs711
1 files changed, 711 insertions, 0 deletions
diff --git a/compiler/rustc_data_structures/src/owning_ref/tests.rs b/compiler/rustc_data_structures/src/owning_ref/tests.rs
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+++ b/compiler/rustc_data_structures/src/owning_ref/tests.rs
@@ -0,0 +1,711 @@
+// FIXME: owning_ref is not sound under stacked borrows. Preferably, get rid of it.
+#[cfg(not(miri))]
+mod owning_ref {
+ use super::super::OwningRef;
+ use super::super::{BoxRef, Erased, ErasedBoxRef, RcRef};
+ use std::cmp::{Ord, Ordering, PartialEq, PartialOrd};
+ use std::collections::hash_map::DefaultHasher;
+ use std::collections::HashMap;
+ use std::hash::{Hash, Hasher};
+ use std::rc::Rc;
+
+ #[derive(Debug, PartialEq)]
+ struct Example(u32, String, [u8; 3]);
+ fn example() -> Example {
+ Example(42, "hello world".to_string(), [1, 2, 3])
+ }
+
+ #[test]
+ fn new_deref() {
+ let or: OwningRef<Box<()>, ()> = OwningRef::new(Box::new(()));
+ assert_eq!(&*or, &());
+ }
+
+ #[test]
+ fn into() {
+ let or: OwningRef<Box<()>, ()> = Box::new(()).into();
+ assert_eq!(&*or, &());
+ }
+
+ #[test]
+ fn map_offset_ref() {
+ let or: BoxRef<Example> = Box::new(example()).into();
+ let or: BoxRef<_, u32> = or.map(|x| &x.0);
+ assert_eq!(&*or, &42);
+
+ let or: BoxRef<Example> = Box::new(example()).into();
+ let or: BoxRef<_, u8> = or.map(|x| &x.2[1]);
+ assert_eq!(&*or, &2);
+ }
+
+ #[test]
+ fn map_heap_ref() {
+ let or: BoxRef<Example> = Box::new(example()).into();
+ let or: BoxRef<_, str> = or.map(|x| &x.1[..5]);
+ assert_eq!(&*or, "hello");
+ }
+
+ #[test]
+ fn map_static_ref() {
+ let or: BoxRef<()> = Box::new(()).into();
+ let or: BoxRef<_, str> = or.map(|_| "hello");
+ assert_eq!(&*or, "hello");
+ }
+
+ #[test]
+ fn map_chained() {
+ let or: BoxRef<String> = Box::new(example().1).into();
+ let or: BoxRef<_, str> = or.map(|x| &x[1..5]);
+ let or: BoxRef<_, str> = or.map(|x| &x[..2]);
+ assert_eq!(&*or, "el");
+ }
+
+ #[test]
+ fn map_chained_inference() {
+ let or = BoxRef::new(Box::new(example().1)).map(|x| &x[..5]).map(|x| &x[1..3]);
+ assert_eq!(&*or, "el");
+ }
+
+ #[test]
+ fn owner() {
+ let or: BoxRef<String> = Box::new(example().1).into();
+ let or = or.map(|x| &x[..5]);
+ assert_eq!(&*or, "hello");
+ assert_eq!(&**or.owner(), "hello world");
+ }
+
+ #[test]
+ fn into_inner() {
+ let or: BoxRef<String> = Box::new(example().1).into();
+ let or = or.map(|x| &x[..5]);
+ assert_eq!(&*or, "hello");
+ let s = *or.into_inner();
+ assert_eq!(&s, "hello world");
+ }
+
+ #[test]
+ fn fmt_debug() {
+ let or: BoxRef<String> = Box::new(example().1).into();
+ let or = or.map(|x| &x[..5]);
+ let s = format!("{:?}", or);
+ assert_eq!(&s, "OwningRef { owner: \"hello world\", reference: \"hello\" }");
+ }
+
+ #[test]
+ fn erased_owner() {
+ let o1: BoxRef<Example, str> = BoxRef::new(Box::new(example())).map(|x| &x.1[..]);
+
+ let o2: BoxRef<String, str> = BoxRef::new(Box::new(example().1)).map(|x| &x[..]);
+
+ let os: Vec<ErasedBoxRef<str>> = vec![o1.erase_owner(), o2.erase_owner()];
+ assert!(os.iter().all(|e| &e[..] == "hello world"));
+ }
+
+ #[test]
+ fn raii_locks() {
+ use super::super::{MutexGuardRef, RwLockReadGuardRef, RwLockWriteGuardRef};
+ use super::super::{RefMutRef, RefRef};
+ use std::cell::RefCell;
+ use std::sync::{Mutex, RwLock};
+
+ {
+ let a = RefCell::new(1);
+ let a = {
+ let a = RefRef::new(a.borrow());
+ assert_eq!(*a, 1);
+ a
+ };
+ assert_eq!(*a, 1);
+ drop(a);
+ }
+ {
+ let a = RefCell::new(1);
+ let a = {
+ let a = RefMutRef::new(a.borrow_mut());
+ assert_eq!(*a, 1);
+ a
+ };
+ assert_eq!(*a, 1);
+ drop(a);
+ }
+ {
+ let a = Mutex::new(1);
+ let a = {
+ let a = MutexGuardRef::new(a.lock().unwrap());
+ assert_eq!(*a, 1);
+ a
+ };
+ assert_eq!(*a, 1);
+ drop(a);
+ }
+ {
+ let a = RwLock::new(1);
+ let a = {
+ let a = RwLockReadGuardRef::new(a.read().unwrap());
+ assert_eq!(*a, 1);
+ a
+ };
+ assert_eq!(*a, 1);
+ drop(a);
+ }
+ {
+ let a = RwLock::new(1);
+ let a = {
+ let a = RwLockWriteGuardRef::new(a.write().unwrap());
+ assert_eq!(*a, 1);
+ a
+ };
+ assert_eq!(*a, 1);
+ drop(a);
+ }
+ }
+
+ #[test]
+ fn eq() {
+ let or1: BoxRef<[u8]> = BoxRef::new(vec![1, 2, 3].into_boxed_slice());
+ let or2: BoxRef<[u8]> = BoxRef::new(vec![1, 2, 3].into_boxed_slice());
+ assert_eq!(or1.eq(&or2), true);
+ }
+
+ #[test]
+ fn cmp() {
+ let or1: BoxRef<[u8]> = BoxRef::new(vec![1, 2, 3].into_boxed_slice());
+ let or2: BoxRef<[u8]> = BoxRef::new(vec![4, 5, 6].into_boxed_slice());
+ assert_eq!(or1.cmp(&or2), Ordering::Less);
+ }
+
+ #[test]
+ fn partial_cmp() {
+ let or1: BoxRef<[u8]> = BoxRef::new(vec![4, 5, 6].into_boxed_slice());
+ let or2: BoxRef<[u8]> = BoxRef::new(vec![1, 2, 3].into_boxed_slice());
+ assert_eq!(or1.partial_cmp(&or2), Some(Ordering::Greater));
+ }
+
+ #[test]
+ fn hash() {
+ let mut h1 = DefaultHasher::new();
+ let mut h2 = DefaultHasher::new();
+
+ let or1: BoxRef<[u8]> = BoxRef::new(vec![1, 2, 3].into_boxed_slice());
+ let or2: BoxRef<[u8]> = BoxRef::new(vec![1, 2, 3].into_boxed_slice());
+
+ or1.hash(&mut h1);
+ or2.hash(&mut h2);
+
+ assert_eq!(h1.finish(), h2.finish());
+ }
+
+ #[test]
+ fn borrow() {
+ let mut hash = HashMap::new();
+ let key = RcRef::<String>::new(Rc::new("foo-bar".to_string())).map(|s| &s[..]);
+
+ hash.insert(key.clone().map(|s| &s[..3]), 42);
+ hash.insert(key.clone().map(|s| &s[4..]), 23);
+
+ assert_eq!(hash.get("foo"), Some(&42));
+ assert_eq!(hash.get("bar"), Some(&23));
+ }
+
+ #[test]
+ fn total_erase() {
+ let a: OwningRef<Vec<u8>, [u8]> = OwningRef::new(vec![]).map(|x| &x[..]);
+ let b: OwningRef<Box<[u8]>, [u8]> =
+ OwningRef::new(vec![].into_boxed_slice()).map(|x| &x[..]);
+
+ let c: OwningRef<Rc<Vec<u8>>, [u8]> = unsafe { a.map_owner(Rc::new) };
+ let d: OwningRef<Rc<Box<[u8]>>, [u8]> = unsafe { b.map_owner(Rc::new) };
+
+ let e: OwningRef<Rc<dyn Erased>, [u8]> = c.erase_owner();
+ let f: OwningRef<Rc<dyn Erased>, [u8]> = d.erase_owner();
+
+ let _g = e.clone();
+ let _h = f.clone();
+ }
+
+ #[test]
+ fn total_erase_box() {
+ let a: OwningRef<Vec<u8>, [u8]> = OwningRef::new(vec![]).map(|x| &x[..]);
+ let b: OwningRef<Box<[u8]>, [u8]> =
+ OwningRef::new(vec![].into_boxed_slice()).map(|x| &x[..]);
+
+ let c: OwningRef<Box<Vec<u8>>, [u8]> = a.map_owner_box();
+ let d: OwningRef<Box<Box<[u8]>>, [u8]> = b.map_owner_box();
+
+ let _e: OwningRef<Box<dyn Erased>, [u8]> = c.erase_owner();
+ let _f: OwningRef<Box<dyn Erased>, [u8]> = d.erase_owner();
+ }
+
+ #[test]
+ fn try_map1() {
+ use std::any::Any;
+
+ let x = Box::new(123_i32);
+ let y: Box<dyn Any> = x;
+
+ assert!(OwningRef::new(y).try_map(|x| x.downcast_ref::<i32>().ok_or(())).is_ok());
+ }
+
+ #[test]
+ fn try_map2() {
+ use std::any::Any;
+
+ let x = Box::new(123_i32);
+ let y: Box<dyn Any> = x;
+
+ assert!(!OwningRef::new(y).try_map(|x| x.downcast_ref::<i32>().ok_or(())).is_err());
+ }
+}
+
+mod owning_handle {
+ use super::super::OwningHandle;
+ use super::super::RcRef;
+ use std::cell::RefCell;
+ use std::rc::Rc;
+ use std::sync::Arc;
+ use std::sync::RwLock;
+
+ #[test]
+ fn owning_handle() {
+ use std::cell::RefCell;
+ let cell = Rc::new(RefCell::new(2));
+ let cell_ref = RcRef::new(cell);
+ let mut handle =
+ OwningHandle::new_with_fn(cell_ref, |x| unsafe { x.as_ref() }.unwrap().borrow_mut());
+ assert_eq!(*handle, 2);
+ *handle = 3;
+ assert_eq!(*handle, 3);
+ }
+
+ #[test]
+ fn try_owning_handle_ok() {
+ use std::cell::RefCell;
+ let cell = Rc::new(RefCell::new(2));
+ let cell_ref = RcRef::new(cell);
+ let mut handle = OwningHandle::try_new::<_, ()>(cell_ref, |x| {
+ Ok(unsafe { x.as_ref() }.unwrap().borrow_mut())
+ })
+ .unwrap();
+ assert_eq!(*handle, 2);
+ *handle = 3;
+ assert_eq!(*handle, 3);
+ }
+
+ #[test]
+ fn try_owning_handle_err() {
+ use std::cell::RefCell;
+ let cell = Rc::new(RefCell::new(2));
+ let cell_ref = RcRef::new(cell);
+ let handle = OwningHandle::try_new::<_, ()>(cell_ref, |x| {
+ if false {
+ return Ok(unsafe { x.as_ref() }.unwrap().borrow_mut());
+ }
+ Err(())
+ });
+ assert!(handle.is_err());
+ }
+
+ #[test]
+ fn nested() {
+ use std::cell::RefCell;
+ use std::sync::{Arc, RwLock};
+
+ let result = {
+ let complex = Rc::new(RefCell::new(Arc::new(RwLock::new("someString"))));
+ let curr = RcRef::new(complex);
+ let curr =
+ OwningHandle::new_with_fn(curr, |x| unsafe { x.as_ref() }.unwrap().borrow_mut());
+ let mut curr = OwningHandle::new_with_fn(curr, |x| {
+ unsafe { x.as_ref() }.unwrap().try_write().unwrap()
+ });
+ assert_eq!(*curr, "someString");
+ *curr = "someOtherString";
+ curr
+ };
+ assert_eq!(*result, "someOtherString");
+ }
+
+ #[test]
+ fn owning_handle_safe() {
+ use std::cell::RefCell;
+ let cell = Rc::new(RefCell::new(2));
+ let cell_ref = RcRef::new(cell);
+ let handle = OwningHandle::new(cell_ref);
+ assert_eq!(*handle, 2);
+ }
+
+ #[test]
+ fn owning_handle_mut_safe() {
+ use std::cell::RefCell;
+ let cell = Rc::new(RefCell::new(2));
+ let cell_ref = RcRef::new(cell);
+ let mut handle = OwningHandle::new_mut(cell_ref);
+ assert_eq!(*handle, 2);
+ *handle = 3;
+ assert_eq!(*handle, 3);
+ }
+
+ #[test]
+ fn owning_handle_safe_2() {
+ let result = {
+ let complex = Rc::new(RefCell::new(Arc::new(RwLock::new("someString"))));
+ let curr = RcRef::new(complex);
+ let curr =
+ OwningHandle::new_with_fn(curr, |x| unsafe { x.as_ref() }.unwrap().borrow_mut());
+ let mut curr = OwningHandle::new_with_fn(curr, |x| {
+ unsafe { x.as_ref() }.unwrap().try_write().unwrap()
+ });
+ assert_eq!(*curr, "someString");
+ *curr = "someOtherString";
+ curr
+ };
+ assert_eq!(*result, "someOtherString");
+ }
+}
+
+// FIXME: owning_ref is not sound under stacked borrows. Preferably, get rid of it.
+#[cfg(not(miri))]
+mod owning_ref_mut {
+ use super::super::BoxRef;
+ use super::super::{BoxRefMut, Erased, ErasedBoxRefMut, OwningRefMut};
+ use std::cmp::{Ord, Ordering, PartialEq, PartialOrd};
+ use std::collections::hash_map::DefaultHasher;
+ use std::collections::HashMap;
+ use std::hash::{Hash, Hasher};
+
+ #[derive(Debug, PartialEq)]
+ struct Example(u32, String, [u8; 3]);
+ fn example() -> Example {
+ Example(42, "hello world".to_string(), [1, 2, 3])
+ }
+
+ #[test]
+ fn new_deref() {
+ let or: OwningRefMut<Box<()>, ()> = OwningRefMut::new(Box::new(()));
+ assert_eq!(&*or, &());
+ }
+
+ #[test]
+ fn new_deref_mut() {
+ let mut or: OwningRefMut<Box<()>, ()> = OwningRefMut::new(Box::new(()));
+ assert_eq!(&mut *or, &mut ());
+ }
+
+ #[test]
+ fn mutate() {
+ let mut or: OwningRefMut<Box<usize>, usize> = OwningRefMut::new(Box::new(0));
+ assert_eq!(&*or, &0);
+ *or = 1;
+ assert_eq!(&*or, &1);
+ }
+
+ #[test]
+ fn into() {
+ let or: OwningRefMut<Box<()>, ()> = Box::new(()).into();
+ assert_eq!(&*or, &());
+ }
+
+ #[test]
+ fn map_offset_ref() {
+ let or: BoxRefMut<Example> = Box::new(example()).into();
+ let or: BoxRef<_, u32> = or.map(|x| &mut x.0);
+ assert_eq!(&*or, &42);
+
+ let or: BoxRefMut<Example> = Box::new(example()).into();
+ let or: BoxRef<_, u8> = or.map(|x| &mut x.2[1]);
+ assert_eq!(&*or, &2);
+ }
+
+ #[test]
+ fn map_heap_ref() {
+ let or: BoxRefMut<Example> = Box::new(example()).into();
+ let or: BoxRef<_, str> = or.map(|x| &mut x.1[..5]);
+ assert_eq!(&*or, "hello");
+ }
+
+ #[test]
+ fn map_static_ref() {
+ let or: BoxRefMut<()> = Box::new(()).into();
+ let or: BoxRef<_, str> = or.map(|_| "hello");
+ assert_eq!(&*or, "hello");
+ }
+
+ #[test]
+ fn map_mut_offset_ref() {
+ let or: BoxRefMut<Example> = Box::new(example()).into();
+ let or: BoxRefMut<_, u32> = or.map_mut(|x| &mut x.0);
+ assert_eq!(&*or, &42);
+
+ let or: BoxRefMut<Example> = Box::new(example()).into();
+ let or: BoxRefMut<_, u8> = or.map_mut(|x| &mut x.2[1]);
+ assert_eq!(&*or, &2);
+ }
+
+ #[test]
+ fn map_mut_heap_ref() {
+ let or: BoxRefMut<Example> = Box::new(example()).into();
+ let or: BoxRefMut<_, str> = or.map_mut(|x| &mut x.1[..5]);
+ assert_eq!(&*or, "hello");
+ }
+
+ #[test]
+ fn map_mut_static_ref() {
+ static mut MUT_S: [u8; 5] = *b"hello";
+
+ let mut_s: &'static mut [u8] = unsafe { &mut MUT_S };
+
+ let or: BoxRefMut<()> = Box::new(()).into();
+ let or: BoxRefMut<_, [u8]> = or.map_mut(move |_| mut_s);
+ assert_eq!(&*or, b"hello");
+ }
+
+ #[test]
+ fn map_mut_chained() {
+ let or: BoxRefMut<String> = Box::new(example().1).into();
+ let or: BoxRefMut<_, str> = or.map_mut(|x| &mut x[1..5]);
+ let or: BoxRefMut<_, str> = or.map_mut(|x| &mut x[..2]);
+ assert_eq!(&*or, "el");
+ }
+
+ #[test]
+ fn map_chained_inference() {
+ let or = BoxRefMut::new(Box::new(example().1))
+ .map_mut(|x| &mut x[..5])
+ .map_mut(|x| &mut x[1..3]);
+ assert_eq!(&*or, "el");
+ }
+
+ #[test]
+ fn try_map_mut() {
+ let or: BoxRefMut<String> = Box::new(example().1).into();
+ let or: Result<BoxRefMut<_, str>, ()> = or.try_map_mut(|x| Ok(&mut x[1..5]));
+ assert_eq!(&*or.unwrap(), "ello");
+
+ let or: BoxRefMut<String> = Box::new(example().1).into();
+ let or: Result<BoxRefMut<_, str>, ()> = or.try_map_mut(|_| Err(()));
+ assert!(or.is_err());
+ }
+
+ #[test]
+ fn owner() {
+ let or: BoxRefMut<String> = Box::new(example().1).into();
+ let or = or.map_mut(|x| &mut x[..5]);
+ assert_eq!(&*or, "hello");
+ assert_eq!(&**or.owner(), "hello world");
+ }
+
+ #[test]
+ fn into_inner() {
+ let or: BoxRefMut<String> = Box::new(example().1).into();
+ let or = or.map_mut(|x| &mut x[..5]);
+ assert_eq!(&*or, "hello");
+ let s = *or.into_inner();
+ assert_eq!(&s, "hello world");
+ }
+
+ #[test]
+ fn fmt_debug() {
+ let or: BoxRefMut<String> = Box::new(example().1).into();
+ let or = or.map_mut(|x| &mut x[..5]);
+ let s = format!("{:?}", or);
+ assert_eq!(&s, "OwningRefMut { owner: \"hello world\", reference: \"hello\" }");
+ }
+
+ #[test]
+ fn erased_owner() {
+ let o1: BoxRefMut<Example, str> =
+ BoxRefMut::new(Box::new(example())).map_mut(|x| &mut x.1[..]);
+
+ let o2: BoxRefMut<String, str> =
+ BoxRefMut::new(Box::new(example().1)).map_mut(|x| &mut x[..]);
+
+ let os: Vec<ErasedBoxRefMut<str>> = vec![o1.erase_owner(), o2.erase_owner()];
+ assert!(os.iter().all(|e| &e[..] == "hello world"));
+ }
+
+ #[test]
+ fn raii_locks() {
+ use super::super::RefMutRefMut;
+ use super::super::{MutexGuardRefMut, RwLockWriteGuardRefMut};
+ use std::cell::RefCell;
+ use std::sync::{Mutex, RwLock};
+
+ {
+ let a = RefCell::new(1);
+ let a = {
+ let a = RefMutRefMut::new(a.borrow_mut());
+ assert_eq!(*a, 1);
+ a
+ };
+ assert_eq!(*a, 1);
+ drop(a);
+ }
+ {
+ let a = Mutex::new(1);
+ let a = {
+ let a = MutexGuardRefMut::new(a.lock().unwrap());
+ assert_eq!(*a, 1);
+ a
+ };
+ assert_eq!(*a, 1);
+ drop(a);
+ }
+ {
+ let a = RwLock::new(1);
+ let a = {
+ let a = RwLockWriteGuardRefMut::new(a.write().unwrap());
+ assert_eq!(*a, 1);
+ a
+ };
+ assert_eq!(*a, 1);
+ drop(a);
+ }
+ }
+
+ #[test]
+ fn eq() {
+ let or1: BoxRefMut<[u8]> = BoxRefMut::new(vec![1, 2, 3].into_boxed_slice());
+ let or2: BoxRefMut<[u8]> = BoxRefMut::new(vec![1, 2, 3].into_boxed_slice());
+ assert_eq!(or1.eq(&or2), true);
+ }
+
+ #[test]
+ fn cmp() {
+ let or1: BoxRefMut<[u8]> = BoxRefMut::new(vec![1, 2, 3].into_boxed_slice());
+ let or2: BoxRefMut<[u8]> = BoxRefMut::new(vec![4, 5, 6].into_boxed_slice());
+ assert_eq!(or1.cmp(&or2), Ordering::Less);
+ }
+
+ #[test]
+ fn partial_cmp() {
+ let or1: BoxRefMut<[u8]> = BoxRefMut::new(vec![4, 5, 6].into_boxed_slice());
+ let or2: BoxRefMut<[u8]> = BoxRefMut::new(vec![1, 2, 3].into_boxed_slice());
+ assert_eq!(or1.partial_cmp(&or2), Some(Ordering::Greater));
+ }
+
+ #[test]
+ fn hash() {
+ let mut h1 = DefaultHasher::new();
+ let mut h2 = DefaultHasher::new();
+
+ let or1: BoxRefMut<[u8]> = BoxRefMut::new(vec![1, 2, 3].into_boxed_slice());
+ let or2: BoxRefMut<[u8]> = BoxRefMut::new(vec![1, 2, 3].into_boxed_slice());
+
+ or1.hash(&mut h1);
+ or2.hash(&mut h2);
+
+ assert_eq!(h1.finish(), h2.finish());
+ }
+
+ #[test]
+ fn borrow() {
+ let mut hash = HashMap::new();
+ let key1 = BoxRefMut::<String>::new(Box::new("foo".to_string())).map(|s| &s[..]);
+ let key2 = BoxRefMut::<String>::new(Box::new("bar".to_string())).map(|s| &s[..]);
+
+ hash.insert(key1, 42);
+ hash.insert(key2, 23);
+
+ assert_eq!(hash.get("foo"), Some(&42));
+ assert_eq!(hash.get("bar"), Some(&23));
+ }
+
+ #[test]
+ fn total_erase() {
+ let a: OwningRefMut<Vec<u8>, [u8]> = OwningRefMut::new(vec![]).map_mut(|x| &mut x[..]);
+ let b: OwningRefMut<Box<[u8]>, [u8]> =
+ OwningRefMut::new(vec![].into_boxed_slice()).map_mut(|x| &mut x[..]);
+
+ let c: OwningRefMut<Box<Vec<u8>>, [u8]> = unsafe { a.map_owner(Box::new) };
+ let d: OwningRefMut<Box<Box<[u8]>>, [u8]> = unsafe { b.map_owner(Box::new) };
+
+ let _e: OwningRefMut<Box<dyn Erased>, [u8]> = c.erase_owner();
+ let _f: OwningRefMut<Box<dyn Erased>, [u8]> = d.erase_owner();
+ }
+
+ #[test]
+ fn total_erase_box() {
+ let a: OwningRefMut<Vec<u8>, [u8]> = OwningRefMut::new(vec![]).map_mut(|x| &mut x[..]);
+ let b: OwningRefMut<Box<[u8]>, [u8]> =
+ OwningRefMut::new(vec![].into_boxed_slice()).map_mut(|x| &mut x[..]);
+
+ let c: OwningRefMut<Box<Vec<u8>>, [u8]> = a.map_owner_box();
+ let d: OwningRefMut<Box<Box<[u8]>>, [u8]> = b.map_owner_box();
+
+ let _e: OwningRefMut<Box<dyn Erased>, [u8]> = c.erase_owner();
+ let _f: OwningRefMut<Box<dyn Erased>, [u8]> = d.erase_owner();
+ }
+
+ #[test]
+ fn try_map1() {
+ use std::any::Any;
+
+ let x = Box::new(123_i32);
+ let y: Box<dyn Any> = x;
+
+ assert!(OwningRefMut::new(y).try_map_mut(|x| x.downcast_mut::<i32>().ok_or(())).is_ok());
+ }
+
+ #[test]
+ fn try_map2() {
+ use std::any::Any;
+
+ let x = Box::new(123_i32);
+ let y: Box<dyn Any> = x;
+
+ assert!(!OwningRefMut::new(y).try_map_mut(|x| x.downcast_mut::<i32>().ok_or(())).is_err());
+ }
+
+ #[test]
+ fn try_map3() {
+ use std::any::Any;
+
+ let x = Box::new(123_i32);
+ let y: Box<dyn Any> = x;
+
+ assert!(OwningRefMut::new(y).try_map(|x| x.downcast_ref::<i32>().ok_or(())).is_ok());
+ }
+
+ #[test]
+ fn try_map4() {
+ use std::any::Any;
+
+ let x = Box::new(123_i32);
+ let y: Box<dyn Any> = x;
+
+ assert!(!OwningRefMut::new(y).try_map(|x| x.downcast_ref::<i32>().ok_or(())).is_err());
+ }
+
+ #[test]
+ fn into_owning_ref() {
+ use super::super::BoxRef;
+
+ let or: BoxRefMut<()> = Box::new(()).into();
+ let or: BoxRef<()> = or.into();
+ assert_eq!(&*or, &());
+ }
+
+ struct Foo {
+ u: u32,
+ }
+ struct Bar {
+ f: Foo,
+ }
+
+ #[test]
+ fn ref_mut() {
+ use std::cell::RefCell;
+
+ let a = RefCell::new(Bar { f: Foo { u: 42 } });
+ let mut b = OwningRefMut::new(a.borrow_mut());
+ assert_eq!(b.f.u, 42);
+ b.f.u = 43;
+ let mut c = b.map_mut(|x| &mut x.f);
+ assert_eq!(c.u, 43);
+ c.u = 44;
+ let mut d = c.map_mut(|x| &mut x.u);
+ assert_eq!(*d, 44);
+ *d = 45;
+ assert_eq!(*d, 45);
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-11 22:55:50 +0000