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BTreeMap: lightly refactor the split_off implementation
r? `@Mark-Simulacrum`
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BTree: remove Ord bound where it is absent elsewhere
Some btree methods don't really need an Ord bound and don't have one, while some methods that more obviously don't need it, do have one.
An example of the former is `iter`, even though it explicitly exposes the work of the Ord implementation (["sorted by key"](https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.iter) - but I'm not suggesting it should have the Ord bound). An example of the latter is `new`, which doesn't involve any keys whatsoever.
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btree: use Option's unwrap_unchecked()
Now that https://github.com/rust-lang/rust/issues/81383 is available, start using it.
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BTree: fix documentation of unstable public members
As rightfully requested in #62924 & #70530.
r? `@Mark-Simulacrum`
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BTreeMap: make Ord bound explicit, compile-test its absence
Most `BTreeMap` and `BTreeSet` members are subject to an `Ord` bound but a fair number of methods are not. To better convey and perhaps later tune the `Ord` bound, make it stand out in individual `where` clauses, instead of once far away at the beginning of an `impl` block. This PR does not introduce or remove any bounds.
Also adds compilation test cases checking that the bound doesn't creep in unintended on the historically unbounded methods.
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This reverts commit 4fef39113a514bb270f5661a82fdba17d3e41dbb.
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Add doc aliases for "delete"
This patch adds doc aliases for "delete". The added aliases are supposed to reference usages `delete` in other programming languages.
- `HashMap::remove`, `BTreeMap::remove` -> `Map#delete` and `delete` keyword in JavaScript.
- `HashSet::remove`, `BTreeSet::remove` -> `Set#delete` in JavaScript.
- `mem::drop` -> `delete` keyword in C++.
- `fs::remove_file`, `fs::remove_dir`, `fs::remove_dir_all`-> `File#delete` in Java, `File#delete` and `Dir#delete` in Ruby.
Before this change, searching for "delete" in documentation returned no results.
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This patch adds doc aliases for "delete". The added aliases are
supposed to reference usages `delete` in other programming
languages.
- `HashMap::remove`, `BTreeMap::remove` -> `Map#delete` and `delete`
keyword in JavaScript.
- `HashSet::remove`, `BTreeSet::remove` -> `Set#delete` in JavaScript.
- `mem::drop` -> `delete` keyword in C++.
- `fs::remove_file`, `fs::remove_dir`, `fs::remove_dir_all`
-> `File#delete` in Java, `File#delete` and `Dir#delete` in Ruby.
Before this change, searching for "delete" in documentation
returned no results.
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Stabilize raw ref macros
This stabilizes `raw_ref_macros` (https://github.com/rust-lang/rust/issues/73394), which is possible now that https://github.com/rust-lang/rust/issues/74355 is fixed.
However, as I already said in https://github.com/rust-lang/rust/issues/73394#issuecomment-751342185, I am not particularly happy with the current names of the macros. So I propose we also change them, which means I am proposing to stabilize the following in `core::ptr`:
```rust
pub macro const_addr_of($e:expr) {
&raw const $e
}
pub macro mut_addr_of($e:expr) {
&raw mut $e
}
```
The macro name change means we need another round of FCP. Cc `````@rust-lang/libs`````
Fixes #73394
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Now that https://github.com/rust-lang/rust/issues/81383 is available,
start using it.
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
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BTreeMap: prevent tree from ever being owned by non-root node
This introduces a new marker type, `Dying`, which is used to note trees which are in the process of deallocation. On such trees, some fields may be in an inconsistent state as we are deallocating the tree. Unfortunately, there's not a great way to express conditional unsafety, so the methods for traversal can cause UB if not invoked correctly, but not marked as such. This is not a regression from the previous state, but rather isolates the destructive methods to solely being called on the dying state.
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Trying to shrink_to greater than capacity should be no-op
Per the discussion in https://github.com/rust-lang/rust/issues/56431, `shrink_to` shouldn't panic if you try to make a vector shrink to a capacity greater than its current capacity.
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BTreeMap: test all borrowing interfaces and test more chaotic order behavior
Inspired by #81169, test what happens if you mess up order of the type with which you search (as opposed to the key type).
r? `@Mark-Simulacrum`
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BTreeMap: bring back the key slice for immutable lookup
Pave the way for binary search, by reverting a bit of #73971, which banned `keys` for misbehaving while it was defined for every `BorrowType`. Adding some `debug_assert`s along the way.
r? `@Mark-Simulacrum`
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Avoid hash_slice in VecDeque's Hash implementation
Fixes #80303.
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BTreeMap: prefer bulk_steal functions over specialized ones
The `steal_` functions (apart from their return value) are basically specializations of the more general `bulk_steal_` functions. This PR removes the specializations. The library/alloc benchmarks say this is never slower and up to 6% faster.
r? ``@Mark-Simulacrum``
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Fixes #80303.
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BTreeMap: offer merge in variants with more clarity
r? `@Mark-Simulacrum`
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BTreeMap: clean up a few more comments
And mark `pop` as unsafe.
r? ```@Mark-Simulacrum```
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BTreeMap: expose new_internal function and sanitize from_new_internal
`new_internal` is the functional core of the imperative `push_internal_level`, and `from_new_internal` can easily do a proper job instead of returning a half-baked node.
r? `@Mark-Simulacrum`
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Clarify what the effects of a 'logic error' are
This clarifies what a 'logic error' is (which is a term used to describe what happens if you put things in a hash table or btree and then use something like a refcell to break the internal ordering). This tries to be as vague as possible, as we don't really want to promise what happens, except "bad things, but not UB". This was discussed in #80657
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Always use extend in BinaryHeap::append
This is faster, see #77433.
Fixes #77433
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BTreeMap: tougher checks on code using raw into_kv_pointers
r? `@Mark-Simulacrum`
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See #77433 for why the new heuristic was chosen.
Fixes #77433
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Remove unreachable panics from VecDeque::{front/back}[_mut]
`VecDeque`'s `front`, `front_mut`, `back` and `back_mut` methods are implemented in terms of the index operator, which causes these functions to contain [unreachable panic calls](https://rust.godbolt.org/z/MTnq1o).
This PR reimplements these methods in terms of `get[_mut]` instead.
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Taken from #80293.
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