Struct lazyonce::LazyOnce [−][src]
pub struct LazyOnce<T> { /* fields omitted */ }Wrapper type for lazy initialization
Methods
impl<T> LazyOnce<T>[src]
impl<T> LazyOnce<T>pub fn new() -> Self[src]
pub fn new() -> Selfpub fn get(
&self,
f: impl FnOnce() -> T
) -> &T[src]
pub fn get(
&self,
f: impl FnOnce() -> T
) -> &TGet cached value, or if no value has been cached yet, compute it using the callback function.
If the callback panics, any use of the cell will panic, too.
pub fn try_get(&self) -> Option<&T>[src]
pub fn try_get(&self) -> Option<&T>Get cached value or None if the cell is still empty
pub fn get_mut(
&mut self,
f: impl FnOnce() -> T
) -> &mut T[src]
pub fn get_mut(
&mut self,
f: impl FnOnce() -> T
) -> &mut TGet mutable reference to the cached value, or if no value has been cached yet, compute it using the callback function.
pub fn expect(&self, s: &str) -> &T[src]
pub fn expect(&self, s: &str) -> &TAssume the value has already been computed. Crash if the cell is empty.
Panics
If get() hasn't been called yet.
pub fn into_inner(self) -> Option<T>[src]
pub fn into_inner(self) -> Option<T>Return computed value or None if the cell is empty.
Unlike try_get this returns an owned value, permanently "unwrapping" the cell.