Sha256: 0bf23f7098f1902f181e43c2ffa82a3f86df2c0dbcb9bc0ebce6a0168dd8b060
Contents?: true
Size: 964 Bytes
Versions: 28
Compression:
Stored size: 964 Bytes
Contents
use core::cell::UnsafeCell;
pub struct LazyCell<T> {
contents: UnsafeCell<Option<T>>,
}
impl<T> LazyCell<T> {
pub fn new() -> LazyCell<T> {
LazyCell {
contents: UnsafeCell::new(None),
}
}
pub fn borrow(&self) -> Option<&T> {
unsafe { &*self.contents.get() }.as_ref()
}
pub fn borrow_with(&self, closure: impl FnOnce() -> T) -> &T {
// First check if we're already initialized...
let ptr = self.contents.get();
if let Some(val) = unsafe { &*ptr } {
return val;
}
// Note that while we're executing `closure` our `borrow_with` may
// be called recursively. This means we need to check again after
// the closure has executed. For that we use the `get_or_insert`
// method which will only perform mutation if we aren't already
// `Some`.
let val = closure();
unsafe { (*ptr).get_or_insert(val) }
}
}
Version data entries
28 entries across 26 versions & 1 rubygems