Crate lazycell [−] [src]
This crate provides a LazyCell
struct which acts as a lazily filled
Cell
, but with frozen contents.
With a RefCell
, the inner contents cannot be borrowed for the lifetime of
the entire object, but only of the borrows returned. A LazyCell
is a
variation on RefCell
which allows borrows to be tied to the lifetime of
the outer object.
The limitation of a LazyCell
is that after it is initialized and shared,
it can be modified.
Example
The following example shows a quick example of the basic functionality of
LazyCell
.
use lazycell::LazyCell; let lazycell = LazyCell::new(); assert_eq!(lazycell.borrow(), None); assert!(!lazycell.filled()); lazycell.fill(1).ok(); assert!(lazycell.filled()); assert_eq!(lazycell.borrow(), Some(&1)); assert_eq!(lazycell.into_inner(), Some(1));
AtomicLazyCell
is a variant that uses an atomic variable to manage
coordination in a thread-safe fashion.
Structs
AtomicLazyCell |
A lazily filled |
LazyCell |
A lazily filled |