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Pietro Albini
2024-06-10 14:50:54 +02:00
parent 534b5855a6
commit be9e27e490
24 changed files with 119 additions and 122 deletions
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22
library/std/src/sync/lazy_lock.rs
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@@ -64,7 +64,7 @@ union Data<T, F> {
/// println!("{}", *data.number);
/// }
/// ```
#[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "lazy_cell", since = "1.80.0")]
pub struct LazyLock<T, F = fn() -> T> {
once: Once,
data: UnsafeCell<Data<T, F>>,
@@ -85,8 +85,8 @@ impl<T, F: FnOnce() -> T> LazyLock<T, F> {
/// assert_eq!(&*lazy, "HELLO, WORLD!");
/// ```
#[inline]
#[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
#[rustc_const_stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "lazy_cell", since = "1.80.0")]
#[rustc_const_stable(feature = "lazy_cell", since = "1.80.0")]
pub const fn new(f: F) -> LazyLock<T, F> {
LazyLock { once: Once::new(), data: UnsafeCell::new(Data { f: ManuallyDrop::new(f) }) }
}
@@ -152,7 +152,7 @@ impl<T, F: FnOnce() -> T> LazyLock<T, F> {
/// assert_eq!(&*lazy, &92);
/// ```
#[inline]
#[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "lazy_cell", since = "1.80.0")]
pub fn force(this: &LazyLock<T, F>) -> &T {
this.once.call_once(|| {
// SAFETY: `call_once` only runs this closure once, ever.
@@ -188,7 +188,7 @@ impl<T, F> LazyLock<T, F> {
}
}
#[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "lazy_cell", since = "1.80.0")]
impl<T, F> Drop for LazyLock<T, F> {
fn drop(&mut self) {
match self.once.state() {
@@ -201,7 +201,7 @@ impl<T, F> Drop for LazyLock<T, F> {
}
}
#[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "lazy_cell", since = "1.80.0")]
impl<T, F: FnOnce() -> T> Deref for LazyLock<T, F> {
type Target = T;
@@ -216,7 +216,7 @@ impl<T, F: FnOnce() -> T> Deref for LazyLock<T, F> {
}
}
#[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "lazy_cell", since = "1.80.0")]
impl<T: Default> Default for LazyLock<T> {
/// Creates a new lazy value using `Default` as the initializing function.
#[inline]
@@ -225,7 +225,7 @@ impl<T: Default> Default for LazyLock<T> {
}
}
#[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "lazy_cell", since = "1.80.0")]
impl<T: fmt::Debug, F> fmt::Debug for LazyLock<T, F> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let mut d = f.debug_tuple("LazyLock");
@@ -239,13 +239,13 @@ impl<T: fmt::Debug, F> fmt::Debug for LazyLock<T, F> {
// We never create a `&F` from a `&LazyLock<T, F>` so it is fine
// to not impl `Sync` for `F`.
#[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "lazy_cell", since = "1.80.0")]
unsafe impl<T: Sync + Send, F: Send> Sync for LazyLock<T, F> {}
// auto-derived `Send` impl is OK.
#[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "lazy_cell", since = "1.80.0")]
impl<T: RefUnwindSafe + UnwindSafe, F: UnwindSafe> RefUnwindSafe for LazyLock<T, F> {}
#[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "lazy_cell", since = "1.80.0")]
impl<T: UnwindSafe, F: UnwindSafe> UnwindSafe for LazyLock<T, F> {}
#[cfg(test)]

2
library/std/src/sync/mod.rs
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@@ -182,7 +182,7 @@ pub use self::rwlock::{MappedRwLockReadGuard, MappedRwLockWriteGuard};
#[stable(feature = "rust1", since = "1.0.0")]
pub use self::rwlock::{RwLock, RwLockReadGuard, RwLockWriteGuard};
#[stable(feature = "lazy_cell", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "lazy_cell", since = "1.80.0")]
pub use self::lazy_lock::LazyLock;
#[stable(feature = "once_cell", since = "1.70.0")]
pub use self::once_lock::OnceLock;