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2022-03-23Refactor set_ptr_value as with_metadata_ofAndreas Molzer-6/+7
By reversing the arguments we achieve several clarifications: - The function closely resembles `cast` but with an argument to initialized the metadata. This is easier to teach and answers an long outstanding question that had restricted cast to `Sized` targets initially. See multiples reviews of <https://github.com/rust-lang/rust/pull/47631> - The 'object identity', in the form or provenance, is now preserved from the call receiver to the result. This helps explain the method as a builder-style, instead of some kind of setter that would modify something in-place. Ensuring that the result has the identity of the `self` argument is also beneficial for an intuition of effects. - An outstanding concern, 'Correct argument type', is avoided by not committing to any specific argument type. This is consistent with cast which does not require its receiver to be a raw address.
2022-03-23Explicitly mention overflow is what we're checkingMichael Bradshaw-4/+4
2022-03-23Clarify that `Cow::into_owned` returns owned dataJonathan Giddy-3/+3
2022-03-22Format unsafe {} blocksMichael Bradshaw-2/+6
2022-03-22Optimize RcInnerPtr::inc_strong instruction countMichael Bradshaw-10/+24
Inspired by this internals thread: https://internals.rust-lang.org/t/rc-optimization-on-64-bit-targets/16362 [The generated assembly is a bit smaller](https://rust.godbolt.org/z/TeTnf6144) and is a more efficient usage of the CPU's instruction cache. `unlikely` doesn't impact any of the small artificial tests I've done, but I've included it in case it might help more complex scenarios when this is inlined.
2022-03-22Remove impossible panic note from `Vec::append`Tobias Bucher-1/+1
Neither the number of elements in a vector can overflow a `usize`, nor can the amount of elements in two vectors.
2022-03-22rename internal helper trait AsIntoIter to AsVecIntoIterThe 8472-10/+10
2022-03-21weaken needlessly restrictive orderings on `Arc::*_count`Ibraheem Ahmed-6/+6
2022-03-21add module-level documentation for vec's in-place iterationThe8472-20/+159
2022-03-21move AsIntoIter helper trait and mark it as unsafeThe8472-11/+14
2022-03-21rename module to better reflect its purposeThe8472-1/+1
2022-03-21Rename `~const Drop` to `~const Destruct`Deadbeef-11/+26
2022-03-20Auto merge of #92962 - frank-king:btree_entry_no_insert, r=Amanieubors-41/+86
BTreeMap::entry: Avoid allocating if no insertion This PR allows the `VacantEntry` to borrow from an empty tree with no root, and to lazily allocate a new root node when the user calls `.insert(value)`.
2022-03-18impl From<&[T; N]> and From<&mut [T; N]> for Vec<T>Jake Goulding-0/+42
2022-03-18Make Weak::new constCAD97-4/+6
2022-03-16Docs: make Vec::from_raw_parts documentation less strictJP Posma-3/+7
This is my first PR; be gentle! In https://users.rust-lang.org/t/why-does-vec-from-raw-parts-require-same-size-and-not-same-size-capacity/73036/2?u=janpaul123 it was suggested to me that I should make a PR to make the documentation of `Vec::from_raw_parts` less strict, since we don't require `T` to have the same size, just `size_of::<T>() * capacity` to be the same, since that is what results in `Layout::size` being the same in `dealloc`, which is really what matters. Also in https://users.rust-lang.org/t/why-does-vec-from-raw-parts-require-same-size-and-not-same-size-capacity/73036/8?u=janpaul123 it was suggested that it's better to use `slice::from_raw_parts`, which I think is useful advise that could also be mentioned in the docs, so I added that too. Let me know what you think! :)
2022-03-16BTree: evaluate static type-related check at compile timeStein Somers-7/+9
2022-03-15fix typosDylan DPC-1/+1
2022-03-14refactor: VecDeques Iter fields to privateDeveloperC-16/+17
Made the fields of VecDeque's Iter private by creating a Iter::new(...) function to create a new instance of Iter and migrating usage to use Iter::new(...).
2022-03-11Auto merge of #94472 - JmPotato:use_maybeuninit_for_vecdeque, r=m-ou-sebors-30/+95
Use MaybeUninit in VecDeque to remove the undefined behavior of slice Signed-off-by: JmPotato <ghzpotato@gmail.com> Ref https://github.com/rust-lang/rust/issues/74189. Adjust the code to follow the [doc.rust-lang.org/reference/behavior-considered-undefined.html](https://doc.rust-lang.org/reference/behavior-considered-undefined.html). * Change the return type of `buffer_as_slice` from `&[T]` to `&[MaybeUninit<T>]`. * Add some corresponding safety comments. Benchmark results: master 8d6f527530f4ba974d922269267fe89050188789 ```rust test collections::vec_deque::tests::bench_pop_back_100 ... bench: 47 ns/iter (+/- 1) test collections::vec_deque::tests::bench_pop_front_100 ... bench: 50 ns/iter (+/- 4) test collections::vec_deque::tests::bench_push_back_100 ... bench: 69 ns/iter (+/- 10) test collections::vec_deque::tests::bench_push_front_100 ... bench: 72 ns/iter (+/- 6) test collections::vec_deque::tests::bench_retain_half_10000 ... bench: 145,891 ns/iter (+/- 7,975) test collections::vec_deque::tests::bench_retain_odd_10000 ... bench: 141,647 ns/iter (+/- 3,711) test collections::vec_deque::tests::bench_retain_whole_10000 ... bench: 120,132 ns/iter (+/- 4,078) ``` This PR ```rust test collections::vec_deque::tests::bench_pop_back_100 ... bench: 48 ns/iter (+/- 2) test collections::vec_deque::tests::bench_pop_front_100 ... bench: 51 ns/iter (+/- 3) test collections::vec_deque::tests::bench_push_back_100 ... bench: 73 ns/iter (+/- 2) test collections::vec_deque::tests::bench_push_front_100 ... bench: 73 ns/iter (+/- 2) test collections::vec_deque::tests::bench_retain_half_10000 ... bench: 131,796 ns/iter (+/- 5,440) test collections::vec_deque::tests::bench_retain_odd_10000 ... bench: 137,563 ns/iter (+/- 3,349) test collections::vec_deque::tests::bench_retain_whole_10000 ... bench: 128,815 ns/iter (+/- 3,289) ```
2022-03-11Classify BinaryHeap & LinkedList unit tests as suchStein Somers-8/+1179
2022-03-11Rollup merge of #94826 - allgoewer:fix-retain-documentation, r=yaahcDylan DPC-6/+6
Improve doc wording for retain on some collections I found the documentation wording on the various retain methods on many collections to be unusual. I tried to invert the relation by switching `such that` with `for which` .
2022-03-11Improve doc wording for retain on some collectionsMaik Allgöwer-6/+6
2022-03-10Rollup merge of #93950 - T-O-R-U-S:use-modern-formatting-for-format!-macros, ↵Dylan DPC-50/+50
r=Mark-Simulacrum Use modern formatting for format! macros This updates the standard library's documentation to use the new format_args syntax. The documentation is worthwhile to update as it should be more idiomatic (particularly for features like this, which are nice for users to get acquainted with). The general codebase is likely more hassle than benefit to update: it'll hurt git blame, and generally updates can be done by folks updating the code if (and when) that makes things more readable with the new format. A few places in the compiler and library code are updated (mostly just due to already having been done when this commit was first authored). `eprintln!("{}", e)` becomes `eprintln!("{e}")`, but `eprintln!("{}", e.kind())` remains untouched.
2022-03-10Use implicit capture syntax in format_argsT-O-R-U-S-50/+50
This updates the standard library's documentation to use the new syntax. The documentation is worthwhile to update as it should be more idiomatic (particularly for features like this, which are nice for users to get acquainted with). The general codebase is likely more hassle than benefit to update: it'll hurt git blame, and generally updates can be done by folks updating the code if (and when) that makes things more readable with the new format. A few places in the compiler and library code are updated (mostly just due to already having been done when this commit was first authored).
2022-03-10Revert accidental stabilizationOli Scherer-2/+1
2022-03-10Use MaybeUninit in VecDeque to remove the undefined behavior of sliceJmPotato-30/+95
Signed-off-by: JmPotato <ghzpotato@gmail.com>
2022-03-09BTreeMap::entry: Avoid allocating if no insertionFrank King-41/+86
2022-03-09Rollup merge of #94699 - ssomers:btree_prune_insert, r=Dylan-DPCDylan DPC-40/+19
BTree: remove dead data needlessly complicating insert Possibly needless instructions generated r? rust-lang/libs r? ``@Amanieu`` cc ``@frank-king``
2022-03-07Stabilize const_fn_fn_ptr_basics and const_fn_trait_boundEric Holk-1/+1
2022-03-07BTree: remove dead data needlessly complicating insertStein Somers-40/+19
2022-02-28Rollup merge of #92399 - Veeupup:fix_vec_typo, r=Dylan-DPCMatthias Krüger-4/+4
fix typo in btree/vec doc: Self -> self this pr fixes #92345 the documentation refers to the object the method is called for, not the type, so it should be using the lower case self.
2022-02-25Switch bootstrap cfgsMark Rousskov-1/+0
2022-02-25Rollup merge of #94184 - ssomers:btree_tests, r=Dylan-DPCMatthias Krüger-138/+118
BTree: simplify test code Mostly, use `from` & `from_iter`.
2022-02-22Auto merge of #83706 - a1phyr:fix_vec_layout_calculation, r=JohnTitorbors-5/+4
Fix a layout possible miscalculation in `alloc::RawVec` A layout miscalculation could happen in `RawVec` when used with a type whose size isn't a multiple of its alignment. I don't know if such type can exist in Rust, but the Layout API provides ways to manipulate such types. Anyway, it is better to calculate memory size in a consistent way.
2022-02-20BTree: simplify test codeStein Somers-138/+118
2022-02-19Fix some confusing wording and improve slice-search-related docsr00ster91-8/+20
2022-02-19Rollup merge of #92902 - ssomers:docter_drain, r=yaahcMatthias Krüger-25/+47
Improve the documentation of drain members hopefully fixes #92765
2022-02-19Collections: improve the documentation of drain membersStein Somers-25/+47
2022-02-18Rollup merge of #93613 - crlf0710:rename_to_async_iter, r=yaahcMatthias Krüger-4/+4
Move `{core,std}::stream::Stream` to `{core,std}::async_iter::AsyncIterator` Following amendments in https://github.com/rust-lang/rfcs/pull/3208/. cc #79024 cc ``@yoshuawuyts`` ``@joshtriplett``
2022-02-17Rollup merge of #89869 - kpreid:from-doc, r=yaahcMatthias Krüger-4/+13
Add documentation to more `From::from` implementations. For users looking at documentation through IDE popups, this gives them relevant information rather than the generic trait documentation wording “Performs the conversion”. For users reading the documentation for a specific type for any reason, this informs them when the conversion may allocate or copy significant memory versus when it is always a move or cheap copy. Notes on specific cases: * The new documentation for `From<T> for T` explains that it is not a conversion at all. * Also documented `impl<T, U> Into<U> for T where U: From<T>`, the other central blanket implementation of conversion. * The new documentation for construction of maps and sets from arrays of keys mentions the handling of duplicates. Future work could be to do this for *all* code paths that convert an iterable to a map or set. * I did not add documentation to conversions of a specific error type to a more general error type. * I did not add documentation to unstable code. This change was prepared by searching for the text "From<... for" and so may have missed some cases that for whatever reason did not match. I also looked for `Into` impls but did not find any worth documenting by the above criteria.
2022-02-14Describe VecDeque with more consistent namesStein Somers-110/+110
2022-02-12Stabilise inherent_ascii_escape (FCP in #77174)ltdk-2/+1
2022-02-12Fix typoAlphyr-1/+1
Co-authored-by: Josh Triplett <josh@joshtriplett.org>
2022-02-12Fix `shrink` and `capacity_from_bytes`Benoît du Garreau-2/+3
2022-02-12Fix a layout miscalculation in alloc::RawVecBenoît du Garreau-3/+1
2022-02-10Rollup merge of #93824 - Amanieu:stable_cfg_target_has_atomic, r=davidtwcoMatthias Krüger-1/+1
Stabilize cfg_target_has_atomic `target_has_atomic_equal_alignment` is now tracked separately in #93822. Closes #32976
2022-02-09Stabilize cfg_target_has_atomicAmanieu d'Antras-1/+1
Closes #32976
2022-02-09Fix typo in `std::fmt` docsTitus-1/+1
2022-02-08Allow comparing `Vec`s with different allocators using `==`Chayim Refael Friedman-1/+1
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