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A successful advance is now signalled by returning `0` and other values now represent the remaining number
of steps that couldn't be advanced as opposed to the amount of steps that have been advanced during a partial advance_by.
This simplifies adapters a bit, replacing some `match`/`if` with arithmetic. Whether this is beneficial overall depends
on whether `advance_by` is mostly used as a building-block for other iterator methods and adapters or whether
we also see uses by users where `Result` might be more useful.
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Implement Default for some alloc/core iterators
Add `Default` impls to the following collection iterators:
* slice::{Iter, IterMut}
* binary_heap::IntoIter
* btree::map::{Iter, IterMut, Keys, Values, Range, IntoIter, IntoKeys, IntoValues}
* btree::set::{Iter, IntoIter, Range}
* linked_list::IntoIter
* vec::IntoIter
and these adapters:
* adapters::{Chain, Cloned, Copied, Rev, Enumerate, Flatten, Fuse, Rev}
For iterators which are generic over allocators it only implements it for the global allocator because we can't conjure an allocator from nothing or would have to turn the allocator field into an `Option` just for this change.
These changes will be insta-stable.
ACP: https://github.com/rust-lang/libs-team/issues/77
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Remove the assume(!is_null) from Vec::as_ptr
At a guess, this code is leftover from LLVM was worse at keeping track of the niche information here. In any case, we don't need this anymore: Removing this `assume` doesn't get rid of the `nonnull` attribute on the return type.
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Global implements Default so we can use that as bound for all allocators
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This way one can `mem::take()` them out of structs or #[derive(Default)] on structs containing them.
These changes will be insta-stable.
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Now that #63351 is fixed, there's no reason not to.
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In the past, Vec::clone_from was implemented using slice::clone_into.
The code from clone_into was later duplicated into clone_from in
8725e4c337, which is the commit that adds custom allocator support to
Vec. Presumably this was done because the slice::clone_into only works
for vecs with the default allocator so it would have the wrong type to
clone into Vec<T, A>.
Now that the clone_into implementation is moved out into a specializable
trait anyway we might as well use that to share the code between the two
methods.
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Implement `alloc::vec::IsZero` for `Option<$NUM>` types
Fixes #106911
Mirrors the `NonZero$NUM` implementations with an additional `assert_zero_valid`.
`None::<i32>` doesn't stricly satisfy `IsZero` but for the purpose of allocating we can produce more efficient codegen.
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vec::Splice can invalidate the slice::Iter inside vec::Drain.
So we replace them with dangling pointers which, unlike ones to
deallocated memory, are allowed.
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correct allocator.
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`extend(array.iter().copied())`
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Also makes the code dryer.
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Fixed a typo that has been found on two locations in comments.
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Fixes #103326
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Remove incorrect comment in `Vec::drain`
r? ``@scottmcm``
Turns out this comment wasn't correct for 6 years, since #34951, which switched from using `slice::IterMut` into using `slice::Iter`.
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Allow `Vec::leak` when using `no_global_oom_handling`
As [the documentation notes](https://doc.rust-lang.org/std/vec/struct.Vec.html#method.leak), `Vec::leak` hasn't allocated since 1.57.
cc `@Ericson2314` in case I'm missing something.
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Signed-off-by: Alex Saveau <saveau.alexandre@gmail.com>
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Do the `calloc` optimization for `Option<bool>`
Inspired by <https://old.reddit.com/r/rust/comments/xtiqj8/why_is_this_functional_version_faster_than_my_for/iqqy37b/>.
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add Vec::push_within_capacity - fallible, does not allocate
This method can serve several purposes. It
* is fallible
* guarantees that items in Vec aren't moved
* allows loops that do `reserve` and `push` separately to avoid pulling in the allocation machinery a second time in the `push` part which should make things easier on the optimizer
* eases the path towards `ArrayVec` a bit since - compared to `push()` - there are fewer questions around how it should be implemented
I haven't named it `try_push` because that should probably occupy a middle ground that will still try to reserve and only return an error in the unlikely OOM case.
resolves #84649
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Fix in-place collection leak when remaining element destructor panic
Fixes #101628
cc `@the8472`
I went for the drop guard route, placing it immediately before the `forget_allocation_drop_remaining` call and after the comment, as to signal they are closely related.
I also updated the test to check for the leak, though the only change really needed was removing the leak clean up for miri since now that's no longer leaked.
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docs: be less harsh in wording for Vec::from_raw_parts
In particular, be clear that it is sound to specify memory not
originating from a previous `Vec` allocation. That is already suggested
in other parts of the documentation about zero-alloc conversions to Box<[T]>.
Incorporate a constraint from `slice::from_raw_parts` that was missing
but needs to be fulfilled, since a `Vec` can be converted into a slice.
Fixes https://github.com/rust-lang/rust/issues/98780.
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Inspired by <https://old.reddit.com/r/rust/comments/xtiqj8/why_is_this_functional_version_faster_than_my_for/iqqy37b/>.
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There's a bunch of these checks because of special handing for ZSTs in various unsafe implementations of stuff.
This lets them be `T::IS_ZST` instead of `mem::size_of::<T>() == 0` every time, making them both more readable and more terse.
*Not* proposed for stabilization at this time. Would be `pub(crate)` except `alloc` wants to use it too.
(And while it doesn't matter now, if we ever get something like 85836 making it a const can help codegen be simpler.)
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Fix a bunch of typo
This PR will fix some typos detected by [typos].
I only picked the ones I was sure were spelling errors to fix, mostly in
the comments.
[typos]: https://github.com/crate-ci/typos
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This PR will fix some typos detected by [typos].
I only picked the ones I was sure were spelling errors to fix, mostly in
the comments.
[typos]: https://github.com/crate-ci/typos
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Add `vec::Drain{,Filter}::keep_rest`
This PR adds `keep_rest` methods to `vec::Drain` and `vec::DrainFilter` under `drain_keep_rest` feature gate:
```rust
// mod alloc::vec
impl<T, A: Allocator> Drain<'_, T, A> {
pub fn keep_rest(self);
}
impl<T, F, A: Allocator> DrainFilter<'_, T, F, A>
where
F: FnMut(&mut T) -> bool,
{
pub fn keep_rest(self);
}
```
Both these methods cancel draining of elements that were not yet yielded from the iterators. While this needs more testing & documentation, I want at least start the discussion. This may be a potential way out of the "should `DrainFilter` exhaust itself on drop?" argument.
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