Add Default impl

arcshift/CHANGELOG.md

@@ -0,0 +1,3 @@
+## 0.4.0
+
+`ArcShift<T>` now implements `Default` if `T:Default`.

arcshift/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "arcshift"
-version = "0.3.1"
+version = "0.4.0"
 documentation = "https://docs.rs/arcshift/"
 homepage = "https://github.com/avl/arcshift/"
 repository = "https://github.com/avl/arcshift/"

arcshift/src/cell.rs

@@ -12,8 +12,7 @@ use core::ops::Deref;
 /// a non-threadsafe `ArcShiftCellHandle<T>`. This handle implements Deref, giving access
 /// to the pointed to &T. This handle should not be leaked,
 /// but if it is leaked, the effect is that whatever value the ArcShiftCell-instance
-/// pointed to at that time, will forever leak also. All the linked-list nodes from
-/// that entry and onward will also leak. So make sure to not leak the handle!
+/// pointed to at that time, will forever leak also.
 pub struct ArcShiftCell<T: 'static + ?Sized> {
     // UnsafeCell makes ArcShiftCell invariant, which it needs to be
     inner: UnsafeCell<ArcShift<T>>,

arcshift/src/lib.rs

@@ -71,7 +71,8 @@
 //!   inner value). ArcShift can still be used with only shared access ([`ArcShift::shared_get`]),
 //!   and performance is still very good as long as the pointer is current. However, if
 //!   the ArcShift instance is stale (needs reloading, because an update has occurred), reads will
-//!   be approximately twice as costly as for RwLock.
+//!   be approximately twice as costly as for RwLock. One mitigation for this is to use
+//!   [`cell::ArcShiftCell`]. However, this type is not `Sync`, only `Send`.
 //! * When modifying the value, the old version of the value lingers in memory until
 //!   the last ArcShift that uses it has reloaded. Such a reload only happens when the ArcShift
 //!   is accessed using a unique (`&mut`) access (like [`ArcShift::get`] or [`ArcShift::reload`]).
@@ -416,6 +417,12 @@ where
     }
 }
 
+impl<T: Default> Default for ArcShift<T> {
+    fn default() -> Self {
+        ArcShift::new(Default::default())
+    }
+}
+
 impl<T: ?Sized> Debug for ArcShiftWeak<T>
 where
     T: Debug,