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Referencify bool type #940

Merged
merged 3 commits into from
Feb 8, 2021
Merged

Referencify bool type #940

merged 3 commits into from
Feb 8, 2021

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Havvy
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@Havvy Havvy commented Jan 21, 2021

I never knew there was so much to say about booleans.

@Havvy Havvy requested a review from ehuss January 21, 2021 23:40
@Havvy Havvy added A-types Area: Types Language Cleanup Improvements to existing language which is correct but not clear, or missing examples, or the like. S-waiting-on-review Status: The marked PR is awaiting review from a maintainer labels Jan 21, 2021
@Havvy Havvy force-pushed the bool branch 2 times, most recently from 19d8c56 to e821472 Compare January 22, 2021 04:16
I really don't know how to describe layout. I don't know if we should
call it a property of memory objects, specific values, types, or what.
I'm calling them objects here...

I gave all the links with a `p-` prefix that so that they can be
trivially copied and pasted into the other primitive types chapters.
This commit mostly adds links across the reference where things talked
about the boolean type. I also normalized the language so that it always
uses "boolean type". Other links were added as appropriate.

This commit also changes a few "x expressions" to "x operands" for if
and while expressions. The whole books needs this treatment, but while
I was here, I did it for these sections.

I also changed "`#[repr(C)]`" to "the C representation" in unions so
that I could actually link to them without breaking linkcheck.
In practice, this mostly means that constructors are not associated to the type
(e.g. `bool::true`).

Like all primitives, the boolean type [implements][p-impl] the
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Is there a reason this doesn't list other traits like the operator traits? It does seem like a little bit of a gray area of which trait impls are part of the "language", but it is not clear to me how that line is drawn.

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I just referenced the traits on the special traits page, and didn't think too much about the operator traits. It is an oversight, sorta. There's inherent behavior with the operators themselves, but the trait implementations are library-side:

macro_rules! bitand_impl {
    ($($t:ty)*) => ($(
        #[stable(feature = "rust1", since = "1.0.0")]
        impl BitAnd for $t {
            type Output = $t;

            #[inline]
            fn bitand(self, rhs: $t) -> $t { self & rhs }
        }

        forward_ref_binop! { impl BitAnd, bitand for $t, $t }
    )*)
}

bitand_impl! { bool usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 }

Comparison operators are also built-in that way.


How about I add truth tables for all the things you can do with a boolean, and then link to those from the operator expressions?

@Havvy Havvy added S-waiting-on-author Status: The marked PR is awaiting some action (such as code changes) from the PR author. and removed S-waiting-on-review Status: The marked PR is awaiting review from a maintainer labels Jan 25, 2021
@Havvy Havvy added S-waiting-on-review Status: The marked PR is awaiting review from a maintainer New Content Missing features or aspects of language not currently documented. and removed S-waiting-on-author Status: The marked PR is awaiting some action (such as code changes) from the PR author. labels Jan 26, 2021
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👍

@ehuss ehuss merged commit 5037683 into rust-lang:master Feb 8, 2021
@Havvy Havvy deleted the bool branch February 8, 2021 06:06
GuillaumeGomez added a commit to GuillaumeGomez/rust that referenced this pull request Feb 17, 2021
Update books

## nomicon

1 commits in bbf06ad39d1f45654047e9596b750cc6e6d1b693..adca786547d08fe676b2fc7a6f08c2ed5280ca38
2021-01-22 07:07:31 -0800 to 2021-02-16 16:34:20 +0900
- Merge pull request rust-lang/nomicon#254 from mdaverde/ml/adds-compiler-err-lifetimes

## reference

9 commits in f02b09eb6e8af340ad1256a54adb7aae2ff3163e..361367c126290ac17cb4089f8d38fd8b2ac43f98
2021-01-22 01:53:02 -0800 to 2021-02-15 09:58:13 -0800
- Define turbofish in the glossary (rust-lang/reference#964)
- Remove enum variant expr (rust-lang/reference#963)
- One sentence is one line src/expressions/* (rust-lang/reference#962)
- Referencify bool type (rust-lang/reference#940)
- Fix typo in type cast expression table (rust-lang/reference#959)
- Define rust (rust-lang/reference#953)
- Remove "Memory Ownership" chapter (rust-lang/reference#952)
- Added setting nightly as a requirement for running tests (rust-lang/reference#955)
- Refactored build steps for better readability (rust-lang/reference#936)

## book

13 commits in e724bd826580ff95df48a8533af7dec1080693d4..db5e8a5105aa22979490dce30e33b68d8645761d
2021-01-20 08:19:49 -0600 to 2021-02-12 16:58:20 -0500
- Update to Rust 1.50
- Fix issue rust-lang/book#2574 - Improve the explanation about the behaviour of `read_line`. (rust-lang/book#2575)
- closures: replace "is called" with "is defined" (rust-lang/book#2556)
- Minor clarification: types -> values in ch16-04 (rust-lang/book#2587)
- fixed hidden code listing (rust-lang/book#2610)
- Merge remote-tracking branch 'origin/pr/2604'
-  (rust-lang/book#2601)
- Merge remote-tracking branch 'origin/pr/2589'
- Fix text wrapping
- Some small rewordings I noticed while rereading just now
-  (rust-lang/book#2592)
- Removed 'of' between type alias in Ch 19-04. (rust-lang/book#2581)
- Merge remote-tracking branch 'origin/pr/2554'

## rust-by-example

2 commits in f633769acef68574427a6fae6c06f13bc2199573..551cc4bc8394feccea6acd21f86d9a4e1d2271a0
2021-01-13 20:58:25 -0300 to 2021-02-03 17:12:37 -0300
- remove // (rust-lang/rust-by-example#1409)
- Update arc.md (rust-lang/rust-by-example#1406)

## edition-guide

3 commits in b91a9a881ee007c12e74e844460ec407cf07a50f..1da3c411f17adb1ba5de1683bb6acee83362b54a
2020-11-02 11:02:03 -0600 to 2021-02-16 16:46:40 -0800
- Update link for no_std. (rust-lang/edition-guide#231)
- Add git link to the source. (rust-lang/edition-guide#228)
- Update musl libc link (rust-lang/edition-guide#230)

## embedded-book

1 commits in ceec19e873be87c6ee5666b030c6bb612f889a96..4cf7981696a85c3e633076c6401611bd3f6346c4
2021-01-03 13:13:10 +0000 to 2021-02-11 10:55:22 +0000
- Fix installing dateutil since it is now a dependency of the GHP import script  (rust-embedded/book#282)
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