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2020-09-07Typo fix scottmcm-1/+1
Thanks, Amanieu Co-authored-by: Amanieu d'Antras <amanieu@gmail.com>
2020-09-07Rollup merge of #76303 - jyn514:vec-assert-doc, r=Dylan-DPCDylan DPC-0/+3
Link to `#capacity-and-reallocation` when using with_capacity Follow up to https://github.com/rust-lang/rust/pull/76058#discussion_r479655750. r? @pickfire
2020-09-05Auto merge of #76217 - RalfJung:maybe-uninit-slice, r=KodrAusbors-11/+15
rename MaybeUninit slice methods The `first` methods conceptually point to the whole slice, not just its first element, so rename them to be consistent with the raw ptr methods on ref-slices. Also, do the equivalent of https://github.com/rust-lang/rust/pull/76047 for the slice reference getters, and make them part of https://github.com/rust-lang/rust/issues/63569 (so far they somehow had no tracking issue). * first_ptr -> slice_as_ptr * first_ptr_mut -> slice_as_mut_ptr * slice_get_ref -> slice_assume_init_ref * slice_get_mut -> slice_assume_init_mut
2020-09-05Nightly is currently 1.48scottmcm-1/+1
2020-09-05rename MaybeUninit slice methodsRalf Jung-11/+15
first_ptr -> slice_as_ptr first_ptr_mut -> slice_as_mut_ptr slice_get_ref -> slice_assume_init_ref slice_get_mut -> slice_assume_init_mut
2020-09-05Rollup merge of #76060 - pickfire:patch-12, r=jyn514Dylan DPC-1/+3
Link vec doc to & reference It is not always obvious that people could see the docs for `&` especially for beginners, it also helps learnability.
2020-09-05Rollup merge of #75994 - mental32:impl-rc-new-cyclic, r=KodrAusDylan DPC-0/+110
`impl Rc::new_cyclic` References #75861 r? @Dylan-DPC
2020-09-04Re-export ArrayChunksMut in allocJosh Stone-0/+2
2020-09-04Auto merge of #75200 - ssomers:btree_valmut, r=Mark-Simulacrumbors-171/+319
BTreeMap: introduce marker::ValMut and reserve Mut for unique access The mutable BTreeMap iterators (apart from `DrainFilter`) are double-ended, meaning they have to rely on a front and a back handle that each represent a reference into the tree. Reserve a type category `marker::ValMut` for them, so that we guarantee that they cannot reach operations on handles with borrow type `marker::Mut`and that these operations can assume unique access to the tree. Including #75195, benchmarks report no genuine change: ``` benchcmp old new --threshold 5 name old ns/iter new ns/iter diff ns/iter diff % speedup btree::map::iter_100 3,333 3,023 -310 -9.30% x 1.10 btree::map::range_unbounded_vs_iter 36,624 31,569 -5,055 -13.80% x 1.16 ``` r? @Mark-Simulacrum
2020-09-04Auto merge of #75207 - dylni:add-slice-check-range, r=KodrAusbors-71/+22
Add `slice::check_range` This method is useful for [`RangeBounds`] parameters. It's even been [rewritten](https://github.com/rust-lang/rust/blob/22ee68dc586440f96b76b32fbd6087507c6afdb9/src/librustc_data_structures/sorted_map.rs#L214) [many](https://github.com/rust-lang/rust/blob/22ee68dc586440f96b76b32fbd6087507c6afdb9/library/alloc/src/vec.rs#L1299) [times](https://github.com/rust-lang/rust/blob/22ee68dc586440f96b76b32fbd6087507c6afdb9/library/core/src/slice/mod.rs#L2441) in the standard library, sometimes assuming that the bounds won't be [`usize::MAX`]. For example, [`Vec::drain`] creates an empty iterator when [`usize::MAX`] is used as an inclusive end bound: ```rust assert!(vec![1].drain(..=usize::max_value()).eq(iter::empty())); ``` If this PR is merged, I'll create another to use it for those methods. [`RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html [`usize::MAX`]: https://doc.rust-lang.org/std/primitive.usize.html#associatedconstant.MAX [`Vec::drain`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.drain
2020-09-03Add `[T; N]: TryFrom<Vec<T>>`Scott McMurray-0/+52
This is very similar to the existing `Box<[T; N]>: TryFrom<Box<[T]>>`, but allows avoiding the `shrink_to_fit` if you have a vector and not a boxed slice.
2020-09-04Add slice primitive link to vecIvan Tham-1/+2
2020-09-03Link to `#capacity-and-reallocation` when using with_capacityJoshua Nelson-0/+3
2020-09-03fix debug assertionThe8472-4/+18
The InPlaceIterable debug assert checks that the write pointer did not advance beyond the read pointer. But TrustedRandomAccess never advances the read pointer, thus triggering the assert. Skip the assert if the source pointer did not change during iteration.
2020-09-03improve comments and namingThe8472-25/+56
2020-09-03add explanation to specialization markerThe8472-0/+6
2020-09-03remove separate no-drop code path since it resulted in more LLVM IRThe8472-32/+15
2020-09-03remove empty Vec extend optimizationThe8472-14/+2
The optimization meant that every extend code path had to emit llvm IR for from_iter and extend spec_extend, which likely impacts compile times while only improving a few edge-cases
2020-09-03get things to work under min_specialization by leaning more heavily on ↵The8472-8/+14
#[rustc_unsafe_specialization_marker]
2020-09-03apply required min_specialization attributesThe8472-1/+7
2020-09-03generalize in-place collect to types of same size and alignmentThe8472-21/+31
2020-09-03increase comment verbosityThe8472-2/+2
2020-09-03work around compiler overhead around lambdas in generics by extracting them ↵The8472-34/+39
into free functions
2020-09-03extract IntoIter drop/forget used by specialization into separate methodsThe8472-15/+25
2020-09-03remove redundant castThe8472-1/+1
2020-09-03move unsafety into method, not relevant to callerThe8472-2/+2
2020-09-03replace unsafe ptr::write with deref-write, benchmarks show no differenceThe8472-10/+4
2020-09-03pacify tidyThe8472-6/+6
2020-09-03replace drop flag with ManuallyDropThe8472-6/+4
2020-09-03mark as_inner as unsafe and update commentsThe8472-5/+9
2020-09-03avoid exposing that binary heap's IntoIter is backed by vec::IntoIter, use a ↵The8472-9/+26
private trait instead
2020-09-03fix build issue due to stabilized featureThe8472-0/+1
2020-09-03impl TrustedRandomAccess for vec::IntoIterThe8472-1/+22
2020-09-03remove unecessary feature flagThe8472-1/+0
# Conflicts: # library/alloc/src/lib.rs
2020-09-03move free-standing method into trait implThe8472-79/+75
2020-09-03fix some in-place-collect edge-casesThe8472-0/+13
- it's an allocation optimization, so don't attempt to do it on ZSTs - drop the tail of partially exhausted iters
2020-09-03remove redundant codeThe8472-7/+1
2020-09-03improve commentsThe8472-7/+10
2020-09-03specialize creating a Vec from a slice iterator where T: CopyThe8472-0/+14
this was already implemented for Extend but not for FromIterator
2020-09-03restore SpecFrom<T, TrustedLen<Item=T>> specialization by nestingThe8472-1/+29
specializations
2020-09-03use From specializations on extend if extended Vec is emptyThe8472-3/+25
this enables in-place iteration and allocation reuse in additional cases
2020-09-03use memmove instead of generic in-place iteration for IntoIter sourceThe8472-2/+10
this is the original SpecExtend<_, IntoIter> logic except generalizing the fast-path to include a memmove
2020-09-03restore Vec::extend specialization for vec::IntoIter sources thatThe8472-0/+9
was lost during refactoring
2020-09-03hide binary_heap::IntoIter internals behind impl TraitThe8472-1/+2
2020-09-03recover vectorizationThe8472-23/+54
switch to try_fold and segregate the drop handling to keep collect::<Vec<u8>>() and similar optimizer-friendly It comes at the cost of less accurate debug_asserts and code complexity
2020-09-03simplify pointer arithmeticThe8472-11/+15
2020-09-03use add instead of offsetThe8472-1/+1
2020-09-03implement drop handlingThe8472-7/+26
2020-09-03assert that SourceIter requirements have not been violated by the pipelineThe8472-0/+2
2020-09-03mark SourceIter as unsafe, document invariantsThe8472-2/+2
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