pub struct LazyCell<T, F = fn() -> T> { /* private fields */ }
Expand description
A value which is initialized on the first access.
For a thread-safe version of this struct, see std::sync::LazyLock
.
§Examples
Implementations§
source§impl<T, F> LazyCell<T, F>where
F: FnOnce() -> T,
impl<T, F> LazyCell<T, F>where
F: FnOnce() -> T,
1.80.0 (const: 1.80.0) · sourcepub const fn new(f: F) -> LazyCell<T, F>
pub const fn new(f: F) -> LazyCell<T, F>
Creates a new lazy value with the given initializing function.
§Examples
sourcepub fn into_inner(this: LazyCell<T, F>) -> Result<T, F>
🔬This is a nightly-only experimental API. (lazy_cell_into_inner
#125623)
pub fn into_inner(this: LazyCell<T, F>) -> Result<T, F>
lazy_cell_into_inner
#125623)Consumes this LazyCell
returning the stored value.
Returns Ok(value)
if Lazy
is initialized and Err(f)
otherwise.
§Examples
Trait Implementations§
Auto Trait Implementations§
impl<T, F = fn() -> T> !Freeze for LazyCell<T, F>
impl<T, F = fn() -> T> !RefUnwindSafe for LazyCell<T, F>
impl<T, F> Send for LazyCell<T, F>
impl<T, F = fn() -> T> !Sync for LazyCell<T, F>
impl<T, F> Unpin for LazyCell<T, F>
impl<T, F> UnwindSafe for LazyCell<T, F>where
F: UnwindSafe,
T: UnwindSafe,
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more