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193 Commits

Author SHA1 Message Date
Dylan DPC 5b8f76d564 Rollup merge of #76303 - jyn514:vec-assert-doc, r=Dylan-DPC 
Link to `#capacity-and-reallocation` when using with_capacity

Follow up to https://github.com/rust-lang/rust/pull/76058#discussion_r479655750.
r? @pickfire
 2020-09-07 01:17:56 +02:00
bors cdc8f0606d Auto merge of #76217 - RalfJung:maybe-uninit-slice, r=KodrAus 
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
 2020-09-05 21:02:18 +00:00
Ralf Jung cff5f56886 rename MaybeUninit slice methods 
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
 2020-09-05 17:24:22 +02:00
Dylan DPC 86cf7976e2 Rollup merge of #76060 - pickfire:patch-12, r=jyn514 
Link vec doc to & reference

It is not always obvious that people could see the docs for `&`
especially for beginners, it also helps learnability.
 2020-09-05 16:28:24 +02:00
Dylan DPC 4bd3f266b0 Rollup merge of #75994 - mental32:impl-rc-new-cyclic, r=KodrAus 
`impl Rc::new_cyclic`

References #75861

r? @Dylan-DPC
 2020-09-05 16:28:22 +02:00
bors 70c5f6efc4 Auto merge of #75200 - ssomers:btree_valmut, r=Mark-Simulacrum 
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
 2020-09-04 23:16:23 +00:00
bors ef55a0a92f Auto merge of #75207 - dylni:add-slice-check-range, r=KodrAus 
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
 2020-09-04 12:21:43 +00:00
Ivan Tham 85146b9db7 Add slice primitive link to vec 2020-09-04 09:50:50 +08:00
Joshua Nelson 7b823df489 Link to #capacity-and-reallocation when using with_capacity 2020-09-03 18:08:25 -04:00
The8472 2f23a0fcca fix debug assertion 
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.
 2020-09-03 22:15:47 +02:00
The8472 8e5fe5569b improve comments and naming 2020-09-03 20:59:37 +02:00
The8472 6464586542 add explanation to specialization marker 2020-09-03 20:59:36 +02:00
The8472 acdd441cc3 remove separate no-drop code path since it resulted in more LLVM IR 2020-09-03 20:59:36 +02:00
The8472 435219dd82 remove empty Vec extend optimization 
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
 2020-09-03 20:59:35 +02:00
The8472 9aeea00222 get things to work under min_specialization by leaning more heavily on #[rustc_unsafe_specialization_marker] 2020-09-03 20:59:34 +02:00
The8472 bec9f9223c apply required min_specialization attributes 2020-09-03 20:59:32 +02:00
The8472 5530858a08 generalize in-place collect to types of same size and alignment 2020-09-03 20:59:31 +02:00
The8472 fa34b39cd6 increase comment verbosity 2020-09-03 20:59:30 +02:00
The8472 872ab780c0 work around compiler overhead around lambdas in generics by extracting them into free functions 2020-09-03 20:59:29 +02:00
The8472 771b8ecc83 extract IntoIter drop/forget used by specialization into separate methods 2020-09-03 20:59:29 +02:00
The8472 a7a8b52e91 remove redundant cast 2020-09-03 20:59:28 +02:00
The8472 fe350dd82d move unsafety into method, not relevant to caller 2020-09-03 20:59:27 +02:00
The8472 0d2d033415 replace unsafe ptr::write with deref-write, benchmarks show no difference 2020-09-03 20:59:26 +02:00
The8472 9596e5a2f2 pacify tidy 2020-09-03 20:59:26 +02:00
The8472 6ed05fd995 replace drop flag with ManuallyDrop 2020-09-03 20:59:25 +02:00
The8472 ab382b7661 mark as_inner as unsafe and update comments 2020-09-03 20:59:24 +02:00
The8472 2a51e579f5 avoid exposing that binary heap's IntoIter is backed by vec::IntoIter, use a private trait instead 2020-09-03 20:59:24 +02:00
The8472 0856771248 fix build issue due to stabilized feature 2020-09-03 20:59:23 +02:00
The8472 e85cfa4f22 impl TrustedRandomAccess for vec::IntoIter 2020-09-03 20:59:22 +02:00
The8472 fbb3371e5b remove unecessary feature flag 
# Conflicts:
#	library/alloc/src/lib.rs
 2020-09-03 20:59:21 +02:00
The8472 085eb20a61 move free-standing method into trait impl 2020-09-03 20:59:19 +02:00
The8472 00a32eb54f fix some in-place-collect edge-cases 
- it's an allocation optimization, so don't attempt to do it on ZSTs
- drop the tail of partially exhausted iters
 2020-09-03 20:59:17 +02:00
The8472 8c816b96dd remove redundant code 2020-09-03 20:59:16 +02:00
The8472 cc67c8eb91 improve comments 2020-09-03 20:59:16 +02:00
The8472 290fe895ba specialize creating a Vec from a slice iterator where T: Copy 
this was already implemented for Extend but not for FromIterator
 2020-09-03 20:59:15 +02:00
The8472 dac0edfaaa restore SpecFrom<T, TrustedLen<Item=T>> specialization by nesting 
specializations
 2020-09-03 20:59:15 +02:00
The8472 582fbb1d62 use From specializations on extend if extended Vec is empty 
this enables in-place iteration and allocation reuse in additional cases
 2020-09-03 20:59:14 +02:00
The8472 a4e385a0d0 use memmove instead of generic in-place iteration for IntoIter source 
this is the original SpecExtend<_, IntoIter> logic except generalizing
the fast-path to include a memmove
 2020-09-03 20:59:11 +02:00
The8472 631543dcb4 restore Vec::extend specialization for vec::IntoIter sources that 
was lost during refactoring
 2020-09-03 20:59:11 +02:00
The8472 07a8c1b95a hide binary_heap::IntoIter internals behind impl Trait 2020-09-03 20:59:10 +02:00
The8472 232065074d recover vectorization 
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
 2020-09-03 20:59:09 +02:00
The8472 bead910b21 simplify pointer arithmetic 2020-09-03 20:59:08 +02:00
The8472 328a75f766 use add instead of offset 2020-09-03 20:59:07 +02:00
The8472 88b7ae642c implement drop handling 2020-09-03 20:59:06 +02:00
The8472 73a982e9ec assert that SourceIter requirements have not been violated by the pipeline 2020-09-03 20:59:06 +02:00
The8472 2a327394e4 mark SourceIter as unsafe, document invariants 2020-09-03 20:59:05 +02:00
The8472 bb2d533bb9 in-place collect for Vec. Box<[]> and BinaryHeap IntoIter and some adapters 2020-09-03 20:59:03 +02:00
The8472 076417e978 unrelated typo fix 2020-09-03 20:56:34 +02:00
Ivan Tham 4df64905ea Link & primitive using relative link 2020-09-03 23:02:27 +08:00
bors 08deb863bd Auto merge of #76235 - jyn514:std-intra-links, r=poliorcetics 
Convert many files to intra-doc links

Helps with https://github.com/rust-lang/rust/issues/75080
r? @poliorcetics
I recommend reviewing one commit at a time, but the diff is small enough you can do it all at once if you like :)
 2020-09-03 05:53:48 +00:00