Rollup merge of rust-lang#136289 - Pyr0de:oncecell-docs, r=tgross35

OnceCell & OnceLock docs: Using (un)initialized consistently

Changed
* `set` / `initialize` / `full` to `initialized state`
* `uninitialize` / `empty` to `uninitialized state`
* `f` to `f()`
* Added explaination of `uninitialized state` & `initialized state`

[OnceCell Docs](https://doc.rust-lang.org/nightly/std/cell/struct.OnceCell.html)
[OnceLock Docs](https://doc.rust-lang.org/nightly/std/sync/struct.OnceLock.html)

Fixes rust-lang#85716
`@rustbot` label +A-docs

Author: matthiaskrgr

library/core/src/cell/once.rs

@@ -8,6 +8,9 @@ use crate::{fmt, mem};
 /// only immutable references can be obtained unless one has a mutable reference to the cell
 /// itself. In the same vein, the cell can only be re-initialized with such a mutable reference.
 ///
+/// A `OnceCell` can be thought of as a safe abstraction over uninitialized data that becomes
+/// initialized once written.
+///
 /// For a thread-safe version of this struct, see [`std::sync::OnceLock`].
 ///
 /// [`RefCell`]: crate::cell::RefCell
@@ -35,7 +38,7 @@ pub struct OnceCell<T> {
 }
 
 impl<T> OnceCell<T> {
-    /// Creates a new empty cell.
+    /// Creates a new uninitialized cell.
     #[inline]
     #[must_use]
     #[stable(feature = "once_cell", since = "1.70.0")]
@@ -46,7 +49,7 @@ impl<T> OnceCell<T> {
 
     /// Gets the reference to the underlying value.
     ///
-    /// Returns `None` if the cell is empty.
+    /// Returns `None` if the cell is uninitialized.
     #[inline]
     #[stable(feature = "once_cell", since = "1.70.0")]
     pub fn get(&self) -> Option<&T> {
@@ -56,19 +59,19 @@ impl<T> OnceCell<T> {
 
     /// Gets the mutable reference to the underlying value.
     ///
-    /// Returns `None` if the cell is empty.
+    /// Returns `None` if the cell is uninitialized.
     #[inline]
     #[stable(feature = "once_cell", since = "1.70.0")]
     pub fn get_mut(&mut self) -> Option<&mut T> {
         self.inner.get_mut().as_mut()
     }
 
-    /// Sets the contents of the cell to `value`.
+    /// Initializes the contents of the cell to `value`.
     ///
     /// # Errors
     ///
-    /// This method returns `Ok(())` if the cell was empty and `Err(value)` if
-    /// it was full.
+    /// This method returns `Ok(())` if the cell was uninitialized
+    /// and `Err(value)` if it was already initialized.
     ///
     /// # Examples
     ///
@@ -92,13 +95,13 @@ impl<T> OnceCell<T> {
         }
     }
 
-    /// Sets the contents of the cell to `value` if the cell was empty, then
-    /// returns a reference to it.
+    /// Initializes the contents of the cell to `value` if the cell was
+    /// uninitialized, then returns a reference to it.
     ///
     /// # Errors
     ///
-    /// This method returns `Ok(&value)` if the cell was empty and
-    /// `Err(&current_value, value)` if it was full.
+    /// This method returns `Ok(&value)` if the cell was uninitialized
+    /// and `Err((&current_value, value))` if it was already initialized.
     ///
     /// # Examples
     ///
@@ -130,12 +133,12 @@ impl<T> OnceCell<T> {
         Ok(slot.insert(value))
     }
 
-    /// Gets the contents of the cell, initializing it with `f`
-    /// if the cell was empty.
+    /// Gets the contents of the cell, initializing it to `f()`
+    /// if the cell was uninitialized.
     ///
     /// # Panics
     ///
-    /// If `f` panics, the panic is propagated to the caller, and the cell
+    /// If `f()` panics, the panic is propagated to the caller, and the cell
     /// remains uninitialized.
     ///
     /// It is an error to reentrantly initialize the cell from `f`. Doing
@@ -164,11 +167,11 @@ impl<T> OnceCell<T> {
     }
 
     /// Gets the mutable reference of the contents of the cell,
-    /// initializing it with `f` if the cell was empty.
+    /// initializing it to `f()` if the cell was uninitialized.
     ///
     /// # Panics
     ///
-    /// If `f` panics, the panic is propagated to the caller, and the cell
+    /// If `f()` panics, the panic is propagated to the caller, and the cell
     /// remains uninitialized.
     ///
     /// # Examples
@@ -199,13 +202,13 @@ impl<T> OnceCell<T> {
         }
     }
 
-    /// Gets the contents of the cell, initializing it with `f` if
-    /// the cell was empty. If the cell was empty and `f` failed, an
-    /// error is returned.
+    /// Gets the contents of the cell, initializing it to `f()` if
+    /// the cell was uninitialized. If the cell was uninitialized
+    /// and `f()` failed, an error is returned.
     ///
     /// # Panics
     ///
-    /// If `f` panics, the panic is propagated to the caller, and the cell
+    /// If `f()` panics, the panic is propagated to the caller, and the cell
     /// remains uninitialized.
     ///
     /// It is an error to reentrantly initialize the cell from `f`. Doing
@@ -239,12 +242,12 @@ impl<T> OnceCell<T> {
     }
 
     /// Gets the mutable reference of the contents of the cell, initializing
-    /// it with `f` if the cell was empty. If the cell was empty and `f` failed,
-    /// an error is returned.
+    /// it to `f()` if the cell was uninitialized. If the cell was uninitialized
+    /// and `f()` failed, an error is returned.
     ///
     /// # Panics
     ///
-    /// If `f` panics, the panic is propagated to the caller, and the cell
+    /// If `f()` panics, the panic is propagated to the caller, and the cell
     /// remains uninitialized.
     ///
     /// # Examples
@@ -256,7 +259,7 @@ impl<T> OnceCell<T> {
     ///
     /// let mut cell: OnceCell<u32> = OnceCell::new();
     ///
-    /// // Failed initializers do not change the value
+    /// // Failed attempts to initialize the cell do not change its contents
     /// assert!(cell.get_mut_or_try_init(|| "not a number!".parse()).is_err());
     /// assert!(cell.get().is_none());
     ///
@@ -295,7 +298,7 @@ impl<T> OnceCell<T> {
 
     /// Consumes the cell, returning the wrapped value.
     ///
-    /// Returns `None` if the cell was empty.
+    /// Returns `None` if the cell was uninitialized.
     ///
     /// # Examples
     ///
@@ -321,7 +324,7 @@ impl<T> OnceCell<T> {
 
     /// Takes the value out of this `OnceCell`, moving it back to an uninitialized state.
     ///
-    /// Has no effect and returns `None` if the `OnceCell` hasn't been initialized.
+    /// Has no effect and returns `None` if the `OnceCell` is uninitialized.
     ///
     /// Safety is guaranteed by requiring a mutable reference.
     ///

library/std/src/sync/once_lock.rs

@@ -13,6 +13,9 @@ use crate::sync::Once;
 /// Where OnceLock shines is when LazyLock is too simple to support a given case, as LazyLock
 /// doesn't allow additional inputs to its function after you call [`LazyLock::new(|| ...)`].
 ///
+/// A `OnceLock` can be thought of as a safe abstraction over uninitialized data that becomes
+/// initialized once written.
+///
 /// [`OnceCell`]: crate::cell::OnceCell
 /// [`LazyLock<T, F>`]: crate::sync::LazyLock
 /// [`LazyLock::new(|| ...)`]: crate::sync::LazyLock::new
@@ -126,7 +129,7 @@ pub struct OnceLock<T> {
 }
 
 impl<T> OnceLock<T> {
-    /// Creates a new empty cell.
+    /// Creates a new uninitialized cell.
     #[inline]
     #[must_use]
     #[stable(feature = "once_cell", since = "1.70.0")]
@@ -141,8 +144,8 @@ impl<T> OnceLock<T> {
 
     /// Gets the reference to the underlying value.
     ///
-    /// Returns `None` if the cell is empty, or being initialized. This
-    /// method never blocks.
+    /// Returns `None` if the cell is uninitialized, or being initialized.
+    /// This method never blocks.
     #[inline]
     #[stable(feature = "once_cell", since = "1.70.0")]
     pub fn get(&self) -> Option<&T> {
@@ -156,7 +159,8 @@ impl<T> OnceLock<T> {
 
     /// Gets the mutable reference to the underlying value.
     ///
-    /// Returns `None` if the cell is empty. This method never blocks.
+    /// Returns `None` if the cell is uninitialized, or being initialized.
+    /// This method never blocks.
     #[inline]
     #[stable(feature = "once_cell", since = "1.70.0")]
     pub fn get_mut(&mut self) -> Option<&mut T> {
@@ -194,12 +198,13 @@ impl<T> OnceLock<T> {
         unsafe { self.get_unchecked() }
     }
 
-    /// Sets the contents of this cell to `value`.
+    /// Initializes the contents of the cell to `value`.
     ///
     /// May block if another thread is currently attempting to initialize the cell. The cell is
-    /// guaranteed to contain a value when set returns, though not necessarily the one provided.
+    /// guaranteed to contain a value when `set` returns, though not necessarily the one provided.
     ///
-    /// Returns `Ok(())` if the cell's value was set by this call.
+    /// Returns `Ok(())` if the cell was uninitialized and
+    /// `Err(value)` if the cell was already initialized.
     ///
     /// # Examples
     ///
@@ -228,13 +233,15 @@ impl<T> OnceLock<T> {
         }
     }
 
-    /// Sets the contents of this cell to `value` if the cell was empty, then
-    /// returns a reference to it.
+    /// Initializes the contents of the cell to `value` if the cell was uninitialized,
+    /// then returns a reference to it.
     ///
     /// May block if another thread is currently attempting to initialize the cell. The cell is
-    /// guaranteed to contain a value when set returns, though not necessarily the one provided.
+    /// guaranteed to contain a value when `try_insert` returns, though not necessarily the
+    /// one provided.
     ///
-    /// Returns `Ok(&value)` if the cell was empty and `Err(&current_value, value)` if it was full.
+    /// Returns `Ok(&value)` if the cell was uninitialized and
+    /// `Err((&current_value, value))` if it was already initialized.
     ///
     /// # Examples
     ///
@@ -267,16 +274,16 @@ impl<T> OnceLock<T> {
         }
     }
 
-    /// Gets the contents of the cell, initializing it with `f` if the cell
-    /// was empty.
+    /// Gets the contents of the cell, initializing it to `f()` if the cell
+    /// was uninitialized.
     ///
     /// Many threads may call `get_or_init` concurrently with different
     /// initializing functions, but it is guaranteed that only one function
     /// will be executed.
     ///
     /// # Panics
     ///
-    /// If `f` panics, the panic is propagated to the caller, and the cell
+    /// If `f()` panics, the panic is propagated to the caller, and the cell
     /// remains uninitialized.
     ///
     /// It is an error to reentrantly initialize the cell from `f`. The
@@ -306,13 +313,13 @@ impl<T> OnceLock<T> {
     }
 
     /// Gets the mutable reference of the contents of the cell, initializing
-    /// it with `f` if the cell was empty.
+    /// it to `f()` if the cell was uninitialized.
     ///
     /// This method never blocks.
     ///
     /// # Panics
     ///
-    /// If `f` panics, the panic is propagated to the caller, and the cell
+    /// If `f()` panics, the panic is propagated to the caller, and the cell
     /// remains uninitialized.
     ///
     /// # Examples
@@ -343,13 +350,13 @@ impl<T> OnceLock<T> {
         }
     }
 
-    /// Gets the contents of the cell, initializing it with `f` if
-    /// the cell was empty. If the cell was empty and `f` failed, an
-    /// error is returned.
+    /// Gets the contents of the cell, initializing it to `f()` if
+    /// the cell was uninitialized. If the cell was uninitialized
+    /// and `f()` failed, an error is returned.
     ///
     /// # Panics
     ///
-    /// If `f` panics, the panic is propagated to the caller, and
+    /// If `f()` panics, the panic is propagated to the caller, and
     /// the cell remains uninitialized.
     ///
     /// It is an error to reentrantly initialize the cell from `f`.
@@ -395,14 +402,14 @@ impl<T> OnceLock<T> {
     }
 
     /// Gets the mutable reference of the contents of the cell, initializing
-    /// it with `f` if the cell was empty. If the cell was empty and `f` failed,
-    /// an error is returned.
+    /// it to `f()` if the cell was uninitialized. If the cell was uninitialized
+    /// and `f()` failed, an error is returned.
     ///
     /// This method never blocks.
     ///
     /// # Panics
     ///
-    /// If `f` panics, the panic is propagated to the caller, and
+    /// If `f()` panics, the panic is propagated to the caller, and
     /// the cell remains uninitialized.
     ///
     /// # Examples
@@ -414,7 +421,7 @@ impl<T> OnceLock<T> {
     ///
     /// let mut cell: OnceLock<u32> = OnceLock::new();
     ///
-    /// // Failed initializers do not change the value
+    /// // Failed attempts to initialize the cell do not change its contents
     /// assert!(cell.get_mut_or_try_init(|| "not a number!".parse()).is_err());
     /// assert!(cell.get().is_none());
     ///
@@ -438,7 +445,7 @@ impl<T> OnceLock<T> {
     }
 
     /// Consumes the `OnceLock`, returning the wrapped value. Returns
-    /// `None` if the cell was empty.
+    /// `None` if the cell was uninitialized.
     ///
     /// # Examples
     ///
@@ -460,7 +467,7 @@ impl<T> OnceLock<T> {
 
     /// Takes the value out of this `OnceLock`, moving it back to an uninitialized state.
     ///
-    /// Has no effect and returns `None` if the `OnceLock` hasn't been initialized.
+    /// Has no effect and returns `None` if the `OnceLock` was uninitialized.
     ///
     /// Safety is guaranteed by requiring a mutable reference.
     ///
@@ -526,7 +533,7 @@ impl<T> OnceLock<T> {
 
     /// # Safety
     ///
-    /// The value must be initialized
+    /// The cell must be initialized
     #[inline]
     unsafe fn get_unchecked(&self) -> &T {
         debug_assert!(self.is_initialized());
@@ -535,7 +542,7 @@ impl<T> OnceLock<T> {
 
     /// # Safety
     ///
-    /// The value must be initialized
+    /// The cell must be initialized
     #[inline]
     unsafe fn get_unchecked_mut(&mut self) -> &mut T {
         debug_assert!(self.is_initialized());
@@ -560,7 +567,7 @@ impl<T: UnwindSafe> UnwindSafe for OnceLock<T> {}
 
 #[stable(feature = "once_cell", since = "1.70.0")]
 impl<T> Default for OnceLock<T> {
-    /// Creates a new empty cell.
+    /// Creates a new uninitialized cell.
     ///
     /// # Example
     ///