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Merge pull request #3747 from ncave/rust
[Rust] Updated module let bindings
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,45 +1,86 @@ | ||
| /// Lazy values and one-time initialization. | ||
| // Lazy values and one-time initialization. | ||
|
|
||
| use core::fmt::Debug; | ||
| use crate::Native_::MutCell; | ||
| #[cfg(feature = "threaded")] | ||
| pub type OnceInit<T> = std::sync::OnceLock<T>; | ||
| #[cfg(not(feature = "threaded"))] | ||
| pub type OnceInit<T> = NonSyncLazy::OnceInit<T>; | ||
|
|
||
| pub struct Lazy<T, F = fn() -> T> { | ||
| cell: MutCell<Option<T>>, | ||
| init: MutCell<Option<F>>, | ||
| } | ||
| #[cfg(not(feature = "threaded"))] | ||
| mod NonSyncLazy { | ||
| use crate::Native_::MutCell; | ||
| use core::fmt::Debug; | ||
|
|
||
| impl<T: Clone + Debug, F> Debug for Lazy<T, F> { | ||
| fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result { | ||
| f.debug_struct("Lazy").field("cell", &self.cell).field("init", &"..").finish() | ||
| #[repr(transparent)] | ||
| pub struct OnceInit<T> { | ||
| value: MutCell<Option<T>>, | ||
| } | ||
| } | ||
|
|
||
| impl<T, F> Lazy<T, F> { | ||
| pub const fn new(init: F) -> Lazy<T, F> { | ||
| Lazy { cell: MutCell::new(None), init: MutCell::new(Some(init)) } | ||
| impl<T> OnceInit<T> { | ||
| #[inline] | ||
| pub const fn new() -> OnceInit<T> { | ||
| OnceInit { | ||
| value: MutCell::new(None), | ||
| } | ||
| } | ||
|
|
||
| #[inline] | ||
| pub fn get_or_init<F>(&self, f: F) -> &T | ||
| where | ||
| F: FnOnce() -> T, | ||
| { | ||
| match self.value.get() { | ||
| Some(v) => v, | ||
| None => { | ||
| self.value.set(Some(f())); | ||
| self.value.get().as_ref().unwrap() | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| pub struct Lazy<T, F = fn() -> T> { | ||
| cell: MutCell<Option<T>>, | ||
| init: MutCell<Option<F>>, | ||
| } | ||
| } | ||
|
|
||
| impl<T: Clone, F: Fn() -> T> Lazy<T, F> { | ||
| pub fn force(self: &Lazy<T, F>) -> T { | ||
| match self.cell.get() { | ||
| Some(val) => val, | ||
| None => { | ||
| let val = | ||
| match self.init.take() { | ||
| impl<T: Clone + Debug, F> Debug for Lazy<T, F> { | ||
| fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result { | ||
| f.debug_struct("Lazy") | ||
| .field("cell", &self.cell) | ||
| .field("init", &"..") | ||
| .finish() | ||
| } | ||
| } | ||
|
|
||
| impl<T, F> Lazy<T, F> { | ||
| pub const fn new(init: F) -> Lazy<T, F> { | ||
| Lazy { | ||
| cell: MutCell::new(None), | ||
| init: MutCell::new(Some(init)), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl<T: Clone, F: Fn() -> T> Lazy<T, F> { | ||
| pub fn force(self: &Lazy<T, F>) -> &T { | ||
| match self.cell.get() { | ||
| Some(val) => val, | ||
| None => { | ||
| let val = match self.init.take() { | ||
| Some(f) => f(), | ||
| None => panic!("`Lazy` instance has already been initialized"), | ||
| }; | ||
| self.cell.set(Some(val.clone())); | ||
| val | ||
| self.cell.set(Some(val)); | ||
| self.cell.get().as_ref().unwrap() | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl<T: Default> Default for Lazy<T> { | ||
| /// Creates a new lazy value using `Default` as the initializing function. | ||
| fn default() -> Lazy<T> { | ||
| Lazy::new(T::default) | ||
| impl<T: Default> Default for Lazy<T> { | ||
| /// Creates a new lazy value using `Default` as the initializing function. | ||
| fn default() -> Lazy<T> { | ||
| Lazy::new(T::default) | ||
| } | ||
| } | ||
| } |
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