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708 lines
21 KiB
Rust
708 lines
21 KiB
Rust
mod owning_ref {
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use super::super::OwningRef;
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use super::super::{BoxRef, Erased, ErasedBoxRef, RcRef};
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use std::cmp::{Ord, Ordering, PartialEq, PartialOrd};
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use std::collections::hash_map::DefaultHasher;
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use std::collections::HashMap;
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use std::hash::{Hash, Hasher};
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use std::rc::Rc;
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#[derive(Debug, PartialEq)]
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struct Example(u32, String, [u8; 3]);
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fn example() -> Example {
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Example(42, "hello world".to_string(), [1, 2, 3])
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}
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#[test]
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fn new_deref() {
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let or: OwningRef<Box<()>, ()> = OwningRef::new(Box::new(()));
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assert_eq!(&*or, &());
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}
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#[test]
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fn into() {
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let or: OwningRef<Box<()>, ()> = Box::new(()).into();
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assert_eq!(&*or, &());
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}
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#[test]
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fn map_offset_ref() {
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let or: BoxRef<Example> = Box::new(example()).into();
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let or: BoxRef<_, u32> = or.map(|x| &x.0);
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assert_eq!(&*or, &42);
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let or: BoxRef<Example> = Box::new(example()).into();
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let or: BoxRef<_, u8> = or.map(|x| &x.2[1]);
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assert_eq!(&*or, &2);
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}
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#[test]
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fn map_heap_ref() {
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let or: BoxRef<Example> = Box::new(example()).into();
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let or: BoxRef<_, str> = or.map(|x| &x.1[..5]);
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assert_eq!(&*or, "hello");
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}
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#[test]
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fn map_static_ref() {
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let or: BoxRef<()> = Box::new(()).into();
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let or: BoxRef<_, str> = or.map(|_| "hello");
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assert_eq!(&*or, "hello");
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}
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#[test]
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fn map_chained() {
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let or: BoxRef<String> = Box::new(example().1).into();
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let or: BoxRef<_, str> = or.map(|x| &x[1..5]);
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let or: BoxRef<_, str> = or.map(|x| &x[..2]);
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assert_eq!(&*or, "el");
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}
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#[test]
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fn map_chained_inference() {
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let or = BoxRef::new(Box::new(example().1)).map(|x| &x[..5]).map(|x| &x[1..3]);
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assert_eq!(&*or, "el");
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}
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#[test]
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fn owner() {
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let or: BoxRef<String> = Box::new(example().1).into();
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let or = or.map(|x| &x[..5]);
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assert_eq!(&*or, "hello");
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assert_eq!(&**or.owner(), "hello world");
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}
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#[test]
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fn into_inner() {
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let or: BoxRef<String> = Box::new(example().1).into();
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let or = or.map(|x| &x[..5]);
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assert_eq!(&*or, "hello");
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let s = *or.into_inner();
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assert_eq!(&s, "hello world");
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}
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#[test]
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fn fmt_debug() {
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let or: BoxRef<String> = Box::new(example().1).into();
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let or = or.map(|x| &x[..5]);
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let s = format!("{:?}", or);
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assert_eq!(&s, "OwningRef { owner: \"hello world\", reference: \"hello\" }");
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}
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#[test]
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fn erased_owner() {
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let o1: BoxRef<Example, str> = BoxRef::new(Box::new(example())).map(|x| &x.1[..]);
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let o2: BoxRef<String, str> = BoxRef::new(Box::new(example().1)).map(|x| &x[..]);
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let os: Vec<ErasedBoxRef<str>> = vec![o1.erase_owner(), o2.erase_owner()];
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assert!(os.iter().all(|e| &e[..] == "hello world"));
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}
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#[test]
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fn raii_locks() {
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use super::super::{MutexGuardRef, RwLockReadGuardRef, RwLockWriteGuardRef};
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use super::super::{RefMutRef, RefRef};
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use std::cell::RefCell;
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use std::sync::{Mutex, RwLock};
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{
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let a = RefCell::new(1);
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let a = {
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let a = RefRef::new(a.borrow());
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assert_eq!(*a, 1);
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a
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};
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assert_eq!(*a, 1);
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drop(a);
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}
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{
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let a = RefCell::new(1);
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let a = {
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let a = RefMutRef::new(a.borrow_mut());
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assert_eq!(*a, 1);
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a
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};
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assert_eq!(*a, 1);
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drop(a);
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}
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{
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let a = Mutex::new(1);
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let a = {
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let a = MutexGuardRef::new(a.lock().unwrap());
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assert_eq!(*a, 1);
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a
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};
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assert_eq!(*a, 1);
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drop(a);
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}
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{
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let a = RwLock::new(1);
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let a = {
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let a = RwLockReadGuardRef::new(a.read().unwrap());
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assert_eq!(*a, 1);
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a
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};
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assert_eq!(*a, 1);
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drop(a);
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}
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{
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let a = RwLock::new(1);
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let a = {
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let a = RwLockWriteGuardRef::new(a.write().unwrap());
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assert_eq!(*a, 1);
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a
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};
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assert_eq!(*a, 1);
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drop(a);
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}
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}
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#[test]
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fn eq() {
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let or1: BoxRef<[u8]> = BoxRef::new(vec![1, 2, 3].into_boxed_slice());
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let or2: BoxRef<[u8]> = BoxRef::new(vec![1, 2, 3].into_boxed_slice());
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assert_eq!(or1.eq(&or2), true);
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}
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#[test]
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fn cmp() {
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let or1: BoxRef<[u8]> = BoxRef::new(vec![1, 2, 3].into_boxed_slice());
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let or2: BoxRef<[u8]> = BoxRef::new(vec![4, 5, 6].into_boxed_slice());
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assert_eq!(or1.cmp(&or2), Ordering::Less);
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}
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#[test]
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fn partial_cmp() {
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let or1: BoxRef<[u8]> = BoxRef::new(vec![4, 5, 6].into_boxed_slice());
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let or2: BoxRef<[u8]> = BoxRef::new(vec![1, 2, 3].into_boxed_slice());
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assert_eq!(or1.partial_cmp(&or2), Some(Ordering::Greater));
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}
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#[test]
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fn hash() {
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let mut h1 = DefaultHasher::new();
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let mut h2 = DefaultHasher::new();
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let or1: BoxRef<[u8]> = BoxRef::new(vec![1, 2, 3].into_boxed_slice());
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let or2: BoxRef<[u8]> = BoxRef::new(vec![1, 2, 3].into_boxed_slice());
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or1.hash(&mut h1);
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or2.hash(&mut h2);
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assert_eq!(h1.finish(), h2.finish());
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}
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#[test]
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fn borrow() {
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let mut hash = HashMap::new();
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let key = RcRef::<String>::new(Rc::new("foo-bar".to_string())).map(|s| &s[..]);
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hash.insert(key.clone().map(|s| &s[..3]), 42);
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hash.insert(key.clone().map(|s| &s[4..]), 23);
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assert_eq!(hash.get("foo"), Some(&42));
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assert_eq!(hash.get("bar"), Some(&23));
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}
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#[test]
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fn total_erase() {
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let a: OwningRef<Vec<u8>, [u8]> = OwningRef::new(vec![]).map(|x| &x[..]);
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let b: OwningRef<Box<[u8]>, [u8]> =
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OwningRef::new(vec![].into_boxed_slice()).map(|x| &x[..]);
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let c: OwningRef<Rc<Vec<u8>>, [u8]> = unsafe { a.map_owner(Rc::new) };
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let d: OwningRef<Rc<Box<[u8]>>, [u8]> = unsafe { b.map_owner(Rc::new) };
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let e: OwningRef<Rc<dyn Erased>, [u8]> = c.erase_owner();
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let f: OwningRef<Rc<dyn Erased>, [u8]> = d.erase_owner();
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let _g = e.clone();
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let _h = f.clone();
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}
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#[test]
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fn total_erase_box() {
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let a: OwningRef<Vec<u8>, [u8]> = OwningRef::new(vec![]).map(|x| &x[..]);
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let b: OwningRef<Box<[u8]>, [u8]> =
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OwningRef::new(vec![].into_boxed_slice()).map(|x| &x[..]);
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let c: OwningRef<Box<Vec<u8>>, [u8]> = a.map_owner_box();
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let d: OwningRef<Box<Box<[u8]>>, [u8]> = b.map_owner_box();
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let _e: OwningRef<Box<dyn Erased>, [u8]> = c.erase_owner();
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let _f: OwningRef<Box<dyn Erased>, [u8]> = d.erase_owner();
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}
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#[test]
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fn try_map1() {
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use std::any::Any;
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let x = Box::new(123_i32);
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let y: Box<dyn Any> = x;
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assert!(OwningRef::new(y).try_map(|x| x.downcast_ref::<i32>().ok_or(())).is_ok());
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}
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#[test]
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fn try_map2() {
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use std::any::Any;
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let x = Box::new(123_i32);
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let y: Box<dyn Any> = x;
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assert!(!OwningRef::new(y).try_map(|x| x.downcast_ref::<i32>().ok_or(())).is_err());
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}
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}
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mod owning_handle {
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use super::super::OwningHandle;
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use super::super::RcRef;
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use std::cell::RefCell;
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use std::rc::Rc;
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use std::sync::Arc;
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use std::sync::RwLock;
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#[test]
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fn owning_handle() {
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use std::cell::RefCell;
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let cell = Rc::new(RefCell::new(2));
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let cell_ref = RcRef::new(cell);
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let mut handle =
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OwningHandle::new_with_fn(cell_ref, |x| unsafe { x.as_ref() }.unwrap().borrow_mut());
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assert_eq!(*handle, 2);
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*handle = 3;
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assert_eq!(*handle, 3);
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}
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#[test]
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fn try_owning_handle_ok() {
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use std::cell::RefCell;
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let cell = Rc::new(RefCell::new(2));
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let cell_ref = RcRef::new(cell);
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let mut handle = OwningHandle::try_new::<_, ()>(cell_ref, |x| {
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Ok(unsafe { x.as_ref() }.unwrap().borrow_mut())
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})
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.unwrap();
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assert_eq!(*handle, 2);
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*handle = 3;
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assert_eq!(*handle, 3);
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}
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#[test]
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fn try_owning_handle_err() {
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use std::cell::RefCell;
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let cell = Rc::new(RefCell::new(2));
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let cell_ref = RcRef::new(cell);
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let handle = OwningHandle::try_new::<_, ()>(cell_ref, |x| {
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if false {
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return Ok(unsafe { x.as_ref() }.unwrap().borrow_mut());
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}
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Err(())
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});
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assert!(handle.is_err());
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}
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#[test]
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fn nested() {
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use std::cell::RefCell;
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use std::sync::{Arc, RwLock};
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let result = {
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let complex = Rc::new(RefCell::new(Arc::new(RwLock::new("someString"))));
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let curr = RcRef::new(complex);
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let curr =
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OwningHandle::new_with_fn(curr, |x| unsafe { x.as_ref() }.unwrap().borrow_mut());
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let mut curr = OwningHandle::new_with_fn(curr, |x| {
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unsafe { x.as_ref() }.unwrap().try_write().unwrap()
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});
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assert_eq!(*curr, "someString");
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*curr = "someOtherString";
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curr
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};
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assert_eq!(*result, "someOtherString");
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}
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#[test]
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fn owning_handle_safe() {
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use std::cell::RefCell;
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let cell = Rc::new(RefCell::new(2));
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let cell_ref = RcRef::new(cell);
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let handle = OwningHandle::new(cell_ref);
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assert_eq!(*handle, 2);
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}
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#[test]
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fn owning_handle_mut_safe() {
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use std::cell::RefCell;
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let cell = Rc::new(RefCell::new(2));
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let cell_ref = RcRef::new(cell);
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let mut handle = OwningHandle::new_mut(cell_ref);
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assert_eq!(*handle, 2);
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*handle = 3;
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assert_eq!(*handle, 3);
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}
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#[test]
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fn owning_handle_safe_2() {
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let result = {
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let complex = Rc::new(RefCell::new(Arc::new(RwLock::new("someString"))));
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let curr = RcRef::new(complex);
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let curr =
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OwningHandle::new_with_fn(curr, |x| unsafe { x.as_ref() }.unwrap().borrow_mut());
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let mut curr = OwningHandle::new_with_fn(curr, |x| {
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unsafe { x.as_ref() }.unwrap().try_write().unwrap()
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});
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assert_eq!(*curr, "someString");
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*curr = "someOtherString";
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curr
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};
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assert_eq!(*result, "someOtherString");
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}
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}
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mod owning_ref_mut {
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use super::super::BoxRef;
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use super::super::{BoxRefMut, Erased, ErasedBoxRefMut, OwningRefMut};
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use std::cmp::{Ord, Ordering, PartialEq, PartialOrd};
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use std::collections::hash_map::DefaultHasher;
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use std::collections::HashMap;
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use std::hash::{Hash, Hasher};
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#[derive(Debug, PartialEq)]
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struct Example(u32, String, [u8; 3]);
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fn example() -> Example {
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Example(42, "hello world".to_string(), [1, 2, 3])
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}
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#[test]
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fn new_deref() {
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let or: OwningRefMut<Box<()>, ()> = OwningRefMut::new(Box::new(()));
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assert_eq!(&*or, &());
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}
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#[test]
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fn new_deref_mut() {
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let mut or: OwningRefMut<Box<()>, ()> = OwningRefMut::new(Box::new(()));
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assert_eq!(&mut *or, &mut ());
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}
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#[test]
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fn mutate() {
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let mut or: OwningRefMut<Box<usize>, usize> = OwningRefMut::new(Box::new(0));
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assert_eq!(&*or, &0);
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*or = 1;
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assert_eq!(&*or, &1);
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}
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#[test]
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fn into() {
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let or: OwningRefMut<Box<()>, ()> = Box::new(()).into();
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assert_eq!(&*or, &());
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}
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#[test]
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fn map_offset_ref() {
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let or: BoxRefMut<Example> = Box::new(example()).into();
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let or: BoxRef<_, u32> = or.map(|x| &mut x.0);
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assert_eq!(&*or, &42);
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let or: BoxRefMut<Example> = Box::new(example()).into();
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let or: BoxRef<_, u8> = or.map(|x| &mut x.2[1]);
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assert_eq!(&*or, &2);
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}
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#[test]
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fn map_heap_ref() {
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let or: BoxRefMut<Example> = Box::new(example()).into();
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let or: BoxRef<_, str> = or.map(|x| &mut x.1[..5]);
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assert_eq!(&*or, "hello");
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}
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#[test]
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fn map_static_ref() {
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let or: BoxRefMut<()> = Box::new(()).into();
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let or: BoxRef<_, str> = or.map(|_| "hello");
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assert_eq!(&*or, "hello");
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}
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#[test]
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fn map_mut_offset_ref() {
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let or: BoxRefMut<Example> = Box::new(example()).into();
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let or: BoxRefMut<_, u32> = or.map_mut(|x| &mut x.0);
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assert_eq!(&*or, &42);
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let or: BoxRefMut<Example> = Box::new(example()).into();
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let or: BoxRefMut<_, u8> = or.map_mut(|x| &mut x.2[1]);
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assert_eq!(&*or, &2);
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}
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#[test]
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fn map_mut_heap_ref() {
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let or: BoxRefMut<Example> = Box::new(example()).into();
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let or: BoxRefMut<_, str> = or.map_mut(|x| &mut x.1[..5]);
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assert_eq!(&*or, "hello");
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}
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#[test]
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fn map_mut_static_ref() {
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static mut MUT_S: [u8; 5] = *b"hello";
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let mut_s: &'static mut [u8] = unsafe { &mut MUT_S };
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let or: BoxRefMut<()> = Box::new(()).into();
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let or: BoxRefMut<_, [u8]> = or.map_mut(move |_| mut_s);
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assert_eq!(&*or, b"hello");
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}
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#[test]
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fn map_mut_chained() {
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let or: BoxRefMut<String> = Box::new(example().1).into();
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let or: BoxRefMut<_, str> = or.map_mut(|x| &mut x[1..5]);
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let or: BoxRefMut<_, str> = or.map_mut(|x| &mut x[..2]);
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assert_eq!(&*or, "el");
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}
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#[test]
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fn map_chained_inference() {
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let or = BoxRefMut::new(Box::new(example().1))
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.map_mut(|x| &mut x[..5])
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.map_mut(|x| &mut x[1..3]);
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assert_eq!(&*or, "el");
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}
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#[test]
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fn try_map_mut() {
|
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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);
|
|
}
|
|
}
|