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-rw-r--r--rust/alloc/boxed.rs131
1 files changed, 64 insertions, 67 deletions
diff --git a/rust/alloc/boxed.rs b/rust/alloc/boxed.rs
index 14af9860c36c..c8173cea8317 100644
--- a/rust/alloc/boxed.rs
+++ b/rust/alloc/boxed.rs
@@ -152,16 +152,13 @@ use core::any::Any;
use core::async_iter::AsyncIterator;
use core::borrow;
use core::cmp::Ordering;
-use core::convert::{From, TryFrom};
use core::error::Error;
use core::fmt;
use core::future::Future;
use core::hash::{Hash, Hasher};
-#[cfg(not(no_global_oom_handling))]
-use core::iter::FromIterator;
-use core::iter::{FusedIterator, Iterator};
+use core::iter::FusedIterator;
use core::marker::Tuple;
-use core::marker::{Destruct, Unpin, Unsize};
+use core::marker::Unsize;
use core::mem;
use core::ops::{
CoerceUnsized, Deref, DerefMut, DispatchFromDyn, Generator, GeneratorState, Receiver,
@@ -218,6 +215,7 @@ impl<T> Box<T> {
#[inline(always)]
#[stable(feature = "rust1", since = "1.0.0")]
#[must_use]
+ #[rustc_diagnostic_item = "box_new"]
pub fn new(x: T) -> Self {
#[rustc_box]
Box::new(x)
@@ -287,9 +285,7 @@ impl<T> Box<T> {
#[must_use]
#[inline(always)]
pub fn pin(x: T) -> Pin<Box<T>> {
- (#[rustc_box]
- Box::new(x))
- .into()
+ Box::new(x).into()
}
/// Allocates memory on the heap then places `x` into it,
@@ -381,12 +377,11 @@ impl<T, A: Allocator> Box<T, A> {
/// ```
#[cfg(not(no_global_oom_handling))]
#[unstable(feature = "allocator_api", issue = "32838")]
- #[rustc_const_unstable(feature = "const_box", issue = "92521")]
#[must_use]
#[inline]
- pub const fn new_in(x: T, alloc: A) -> Self
+ pub fn new_in(x: T, alloc: A) -> Self
where
- A: ~const Allocator + ~const Destruct,
+ A: Allocator,
{
let mut boxed = Self::new_uninit_in(alloc);
unsafe {
@@ -411,12 +406,10 @@ impl<T, A: Allocator> Box<T, A> {
/// # Ok::<(), std::alloc::AllocError>(())
/// ```
#[unstable(feature = "allocator_api", issue = "32838")]
- #[rustc_const_unstable(feature = "const_box", issue = "92521")]
#[inline]
- pub const fn try_new_in(x: T, alloc: A) -> Result<Self, AllocError>
+ pub fn try_new_in(x: T, alloc: A) -> Result<Self, AllocError>
where
- T: ~const Destruct,
- A: ~const Allocator + ~const Destruct,
+ A: Allocator,
{
let mut boxed = Self::try_new_uninit_in(alloc)?;
unsafe {
@@ -446,13 +439,12 @@ impl<T, A: Allocator> Box<T, A> {
/// assert_eq!(*five, 5)
/// ```
#[unstable(feature = "allocator_api", issue = "32838")]
- #[rustc_const_unstable(feature = "const_box", issue = "92521")]
#[cfg(not(no_global_oom_handling))]
#[must_use]
// #[unstable(feature = "new_uninit", issue = "63291")]
- pub const fn new_uninit_in(alloc: A) -> Box<mem::MaybeUninit<T>, A>
+ pub fn new_uninit_in(alloc: A) -> Box<mem::MaybeUninit<T>, A>
where
- A: ~const Allocator + ~const Destruct,
+ A: Allocator,
{
let layout = Layout::new::<mem::MaybeUninit<T>>();
// NOTE: Prefer match over unwrap_or_else since closure sometimes not inlineable.
@@ -487,10 +479,9 @@ impl<T, A: Allocator> Box<T, A> {
/// ```
#[unstable(feature = "allocator_api", issue = "32838")]
// #[unstable(feature = "new_uninit", issue = "63291")]
- #[rustc_const_unstable(feature = "const_box", issue = "92521")]
- pub const fn try_new_uninit_in(alloc: A) -> Result<Box<mem::MaybeUninit<T>, A>, AllocError>
+ pub fn try_new_uninit_in(alloc: A) -> Result<Box<mem::MaybeUninit<T>, A>, AllocError>
where
- A: ~const Allocator + ~const Destruct,
+ A: Allocator,
{
let layout = Layout::new::<mem::MaybeUninit<T>>();
let ptr = alloc.allocate(layout)?.cast();
@@ -518,13 +509,12 @@ impl<T, A: Allocator> Box<T, A> {
///
/// [zeroed]: mem::MaybeUninit::zeroed
#[unstable(feature = "allocator_api", issue = "32838")]
- #[rustc_const_unstable(feature = "const_box", issue = "92521")]
#[cfg(not(no_global_oom_handling))]
// #[unstable(feature = "new_uninit", issue = "63291")]
#[must_use]
- pub const fn new_zeroed_in(alloc: A) -> Box<mem::MaybeUninit<T>, A>
+ pub fn new_zeroed_in(alloc: A) -> Box<mem::MaybeUninit<T>, A>
where
- A: ~const Allocator + ~const Destruct,
+ A: Allocator,
{
let layout = Layout::new::<mem::MaybeUninit<T>>();
// NOTE: Prefer match over unwrap_or_else since closure sometimes not inlineable.
@@ -559,10 +549,9 @@ impl<T, A: Allocator> Box<T, A> {
/// [zeroed]: mem::MaybeUninit::zeroed
#[unstable(feature = "allocator_api", issue = "32838")]
// #[unstable(feature = "new_uninit", issue = "63291")]
- #[rustc_const_unstable(feature = "const_box", issue = "92521")]
- pub const fn try_new_zeroed_in(alloc: A) -> Result<Box<mem::MaybeUninit<T>, A>, AllocError>
+ pub fn try_new_zeroed_in(alloc: A) -> Result<Box<mem::MaybeUninit<T>, A>, AllocError>
where
- A: ~const Allocator + ~const Destruct,
+ A: Allocator,
{
let layout = Layout::new::<mem::MaybeUninit<T>>();
let ptr = alloc.allocate_zeroed(layout)?.cast();
@@ -578,12 +567,11 @@ impl<T, A: Allocator> Box<T, A> {
/// construct a (pinned) `Box` in a different way than with [`Box::new_in`].
#[cfg(not(no_global_oom_handling))]
#[unstable(feature = "allocator_api", issue = "32838")]
- #[rustc_const_unstable(feature = "const_box", issue = "92521")]
#[must_use]
#[inline(always)]
- pub const fn pin_in(x: T, alloc: A) -> Pin<Self>
+ pub fn pin_in(x: T, alloc: A) -> Pin<Self>
where
- A: 'static + ~const Allocator + ~const Destruct,
+ A: 'static + Allocator,
{
Self::into_pin(Self::new_in(x, alloc))
}
@@ -592,8 +580,7 @@ impl<T, A: Allocator> Box<T, A> {
///
/// This conversion does not allocate on the heap and happens in place.
#[unstable(feature = "box_into_boxed_slice", issue = "71582")]
- #[rustc_const_unstable(feature = "const_box", issue = "92521")]
- pub const fn into_boxed_slice(boxed: Self) -> Box<[T], A> {
+ pub fn into_boxed_slice(boxed: Self) -> Box<[T], A> {
let (raw, alloc) = Box::into_raw_with_allocator(boxed);
unsafe { Box::from_raw_in(raw as *mut [T; 1], alloc) }
}
@@ -610,12 +597,8 @@ impl<T, A: Allocator> Box<T, A> {
/// assert_eq!(Box::into_inner(c), 5);
/// ```
#[unstable(feature = "box_into_inner", issue = "80437")]
- #[rustc_const_unstable(feature = "const_box", issue = "92521")]
#[inline]
- pub const fn into_inner(boxed: Self) -> T
- where
- Self: ~const Destruct,
- {
+ pub fn into_inner(boxed: Self) -> T {
*boxed
}
}
@@ -829,9 +812,8 @@ impl<T, A: Allocator> Box<mem::MaybeUninit<T>, A> {
/// assert_eq!(*five, 5)
/// ```
#[unstable(feature = "new_uninit", issue = "63291")]
- #[rustc_const_unstable(feature = "const_box", issue = "92521")]
#[inline]
- pub const unsafe fn assume_init(self) -> Box<T, A> {
+ pub unsafe fn assume_init(self) -> Box<T, A> {
let (raw, alloc) = Box::into_raw_with_allocator(self);
unsafe { Box::from_raw_in(raw as *mut T, alloc) }
}
@@ -864,9 +846,8 @@ impl<T, A: Allocator> Box<mem::MaybeUninit<T>, A> {
/// }
/// ```
#[unstable(feature = "new_uninit", issue = "63291")]
- #[rustc_const_unstable(feature = "const_box", issue = "92521")]
#[inline]
- pub const fn write(mut boxed: Self, value: T) -> Box<T, A> {
+ pub fn write(mut boxed: Self, value: T) -> Box<T, A> {
unsafe {
(*boxed).write(value);
boxed.assume_init()
@@ -1110,9 +1091,8 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
///
/// [memory layout]: self#memory-layout
#[unstable(feature = "allocator_api", issue = "32838")]
- #[rustc_const_unstable(feature = "const_box", issue = "92521")]
#[inline]
- pub const fn into_raw_with_allocator(b: Self) -> (*mut T, A) {
+ pub fn into_raw_with_allocator(b: Self) -> (*mut T, A) {
let (leaked, alloc) = Box::into_unique(b);
(leaked.as_ptr(), alloc)
}
@@ -1122,10 +1102,9 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
issue = "none",
reason = "use `Box::leak(b).into()` or `Unique::from(Box::leak(b))` instead"
)]
- #[rustc_const_unstable(feature = "const_box", issue = "92521")]
#[inline]
#[doc(hidden)]
- pub const fn into_unique(b: Self) -> (Unique<T>, A) {
+ pub fn into_unique(b: Self) -> (Unique<T>, A) {
// Box is recognized as a "unique pointer" by Stacked Borrows, but internally it is a
// raw pointer for the type system. Turning it directly into a raw pointer would not be
// recognized as "releasing" the unique pointer to permit aliased raw accesses,
@@ -1183,9 +1162,8 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
/// assert_eq!(*static_ref, [4, 2, 3]);
/// ```
#[stable(feature = "box_leak", since = "1.26.0")]
- #[rustc_const_unstable(feature = "const_box", issue = "92521")]
#[inline]
- pub const fn leak<'a>(b: Self) -> &'a mut T
+ pub fn leak<'a>(b: Self) -> &'a mut T
where
A: 'a,
{
@@ -1246,16 +1224,16 @@ unsafe impl<#[may_dangle] T: ?Sized, A: Allocator> Drop for Box<T, A> {
#[stable(feature = "rust1", since = "1.0.0")]
impl<T: Default> Default for Box<T> {
/// Creates a `Box<T>`, with the `Default` value for T.
+ #[inline]
fn default() -> Self {
- #[rustc_box]
Box::new(T::default())
}
}
#[cfg(not(no_global_oom_handling))]
#[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_const_unstable(feature = "const_default_impls", issue = "87864")]
-impl<T> const Default for Box<[T]> {
+impl<T> Default for Box<[T]> {
+ #[inline]
fn default() -> Self {
let ptr: Unique<[T]> = Unique::<[T; 0]>::dangling();
Box(ptr, Global)
@@ -1264,8 +1242,8 @@ impl<T> const Default for Box<[T]> {
#[cfg(not(no_global_oom_handling))]
#[stable(feature = "default_box_extra", since = "1.17.0")]
-#[rustc_const_unstable(feature = "const_default_impls", issue = "87864")]
-impl const Default for Box<str> {
+impl Default for Box<str> {
+ #[inline]
fn default() -> Self {
// SAFETY: This is the same as `Unique::cast<U>` but with an unsized `U = str`.
let ptr: Unique<str> = unsafe {
@@ -1461,8 +1439,7 @@ impl<T> From<T> for Box<T> {
}
#[stable(feature = "pin", since = "1.33.0")]
-#[rustc_const_unstable(feature = "const_box", issue = "92521")]
-impl<T: ?Sized, A: Allocator> const From<Box<T, A>> for Pin<Box<T, A>>
+impl<T: ?Sized, A: Allocator> From<Box<T, A>> for Pin<Box<T, A>>
where
A: 'static,
{
@@ -1482,9 +1459,36 @@ where
}
}
+/// Specialization trait used for `From<&[T]>`.
+#[cfg(not(no_global_oom_handling))]
+trait BoxFromSlice<T> {
+ fn from_slice(slice: &[T]) -> Self;
+}
+
+#[cfg(not(no_global_oom_handling))]
+impl<T: Clone> BoxFromSlice<T> for Box<[T]> {
+ #[inline]
+ default fn from_slice(slice: &[T]) -> Self {
+ slice.to_vec().into_boxed_slice()
+ }
+}
+
+#[cfg(not(no_global_oom_handling))]
+impl<T: Copy> BoxFromSlice<T> for Box<[T]> {
+ #[inline]
+ fn from_slice(slice: &[T]) -> Self {
+ let len = slice.len();
+ let buf = RawVec::with_capacity(len);
+ unsafe {
+ ptr::copy_nonoverlapping(slice.as_ptr(), buf.ptr(), len);
+ buf.into_box(slice.len()).assume_init()
+ }
+ }
+}
+
#[cfg(not(no_global_oom_handling))]
#[stable(feature = "box_from_slice", since = "1.17.0")]
-impl<T: Copy> From<&[T]> for Box<[T]> {
+impl<T: Clone> From<&[T]> for Box<[T]> {
/// Converts a `&[T]` into a `Box<[T]>`
///
/// This conversion allocates on the heap
@@ -1498,19 +1502,15 @@ impl<T: Copy> From<&[T]> for Box<[T]> {
///
/// println!("{boxed_slice:?}");
/// ```
+ #[inline]
fn from(slice: &[T]) -> Box<[T]> {
- let len = slice.len();
- let buf = RawVec::with_capacity(len);
- unsafe {
- ptr::copy_nonoverlapping(slice.as_ptr(), buf.ptr(), len);
- buf.into_box(slice.len()).assume_init()
- }
+ <Self as BoxFromSlice<T>>::from_slice(slice)
}
}
#[cfg(not(no_global_oom_handling))]
#[stable(feature = "box_from_cow", since = "1.45.0")]
-impl<T: Copy> From<Cow<'_, [T]>> for Box<[T]> {
+impl<T: Clone> From<Cow<'_, [T]>> for Box<[T]> {
/// Converts a `Cow<'_, [T]>` into a `Box<[T]>`
///
/// When `cow` is the `Cow::Borrowed` variant, this
@@ -1620,7 +1620,6 @@ impl<T, const N: usize> From<[T; N]> for Box<[T]> {
/// println!("{boxed:?}");
/// ```
fn from(array: [T; N]) -> Box<[T]> {
- #[rustc_box]
Box::new(array)
}
}
@@ -1899,8 +1898,7 @@ impl<T: ?Sized, A: Allocator> fmt::Pointer for Box<T, A> {
}
#[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_const_unstable(feature = "const_box", issue = "92521")]
-impl<T: ?Sized, A: Allocator> const Deref for Box<T, A> {
+impl<T: ?Sized, A: Allocator> Deref for Box<T, A> {
type Target = T;
fn deref(&self) -> &T {
@@ -1909,8 +1907,7 @@ impl<T: ?Sized, A: Allocator> const Deref for Box<T, A> {
}
#[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_const_unstable(feature = "const_box", issue = "92521")]
-impl<T: ?Sized, A: Allocator> const DerefMut for Box<T, A> {
+impl<T: ?Sized, A: Allocator> DerefMut for Box<T, A> {
fn deref_mut(&mut self) -> &mut T {
&mut **self
}
generated by cgit (git 2.34.1) at 2024-05-23 17:48:00 +0000