bjoernager/rust
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Auto merge of #87921 - kellerkindt:master, r=kennytm

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Add Saturating type (based on Wrapping type)

Tracking #87920

### Unresolved Questions
<!--
Include any open questions that need to be answered before the feature can be
stabilised.
-->

 - [x] ~`impl Div for Saturating<T>` falls back on inner integer division - which seems alright?~
    - [x] add `saturating_div`? (to respect division by `-1`)
 - [x] There is no `::saturating_shl` and `::saturating_shr`. (How to) implement `Shl`, `ShlAssign`, `Shr` and `ShrAssign`?
   - [naively](3f7d2ce28f8cf4dec56bf65fa2e6da0cf329ec55)
 - [x] ~`saturating_neg` is only implemented on [signed integer types](https://doc.rust-lang.org/std/?search=saturating_n)~
 - [x] Is the implementation copied over from the `Wrapping`-type correct for `Saturating`?
   - [x] `Saturating::rotate_left`
   - [x] `Saturating::rotate_right`
   - [x] `Not`
   - [x] `BitXorOr` and `BitXorOrAssign`
   - [x] `BitOr` and `BitOrAssign`
   - [x] `BitAnd` and `BitAndAssign`
   - [x] `Saturating::swap_bytes`
   - [x] `Saturating::reverse_bits`
This commit is contained in:
bors 2021-08-28 23:39:02 +00:00
commit 677b517e66
6 changed files with 1048 additions and 0 deletions
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2
library/std/src/lib.rs
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@ -310,6 +310,8 @@
#![feature(ptr_internals)]
#![feature(rustc_attrs)]
#![feature(rustc_private)]
#![feature(saturating_div)]
#![feature(saturating_int_impl)]
#![feature(slice_concat_ext)]
#![feature(slice_internals)]
#![feature(slice_ptr_get)]