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Add `impl<T> FromIterator<T> for Arc/Rc<[T]>` #61953

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merged 13 commits into from Jul 13, 2019

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commented Jun 19, 2019

Add implementations of FromIterator<T> for Arc/Rc<[T]> with symmetrical logic.

This also takes advantage of specialization in the case of iterators with known length (TrustedLen) to elide the final allocation/copying from a Vec<T> into Rc<[T]> because we can allocate the space for the Rc<[T]> directly when the size is known. This is the primary motivation and why this is to be preferred over iter.collect::<Vec<_>>().into(): Rc<[T]>.

Moreover, this PR does some refactoring in some places.

r? @RalfJung for the code
cc @alexcrichton from T-libs

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commented Jun 19, 2019

(#60667 will likely land much sooner; I'll rebase after that has happened)

Done.

@Centril Centril force-pushed the Centril:shared-from-iter branch from 096f5e2 to df5d3a4 Jun 19, 2019
@Centril Centril force-pushed the Centril:shared-from-iter branch from df5d3a4 to 4b44ad9 Jun 20, 2019
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commented Jun 20, 2019

Are there tests covering this new code? If not, could you add some? I'd like to run Miri on this.

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commented Jun 20, 2019

@RalfJung There are some doc-tests, but they might be sparse? Does miri run doc-tests?

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commented Jun 20, 2019

No it does not, unfortunately (rust-lang/miri#584). Could you add #[test] methods?

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commented Jun 20, 2019

Sure; I'll do that and try to exercise some more pathological cases also.

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commented Jun 20, 2019

Well done overall! This all looks great, and I wish more code was commented like this.
Just found one comment nit.

I'd like to run Miri though before r+'ing.

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commented Jun 21, 2019

Added some more tests... :)

src/liballoc/sync.rs Outdated Show resolved Hide resolved
@Centril Centril modified the milestones: 1.37, 1.38 Jul 2, 2019
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commented Jul 12, 2019

The final comment period, with a disposition to merge, as per the review above, is now complete.

As the automated representative of the governance process, I would like to thank the author for their work and everyone else who contributed.

The RFC will be merged soon.

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commented Jul 12, 2019

@bors: r=RalfJung

r? @RalfJung

Moving back to the technical reviewer

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commented Jul 12, 2019

📌 Commit 85def30 has been approved by RalfJung

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commented Jul 12, 2019

⌛️ Testing commit 85def30 with merge 7de19ce...

bors added a commit that referenced this pull request Jul 12, 2019
Add `impl<T> FromIterator<T> for Arc/Rc<[T]>`

Add implementations of `FromIterator<T> for Arc/Rc<[T]>` with symmetrical logic.

This also takes advantage of specialization in the case of iterators with known length (`TrustedLen`) to elide the final allocation/copying from a `Vec<T>` into `Rc<[T]>` because we can allocate the space for the `Rc<[T]>` directly when the size is known. This is the primary motivation and why this is to be preferred over `iter.collect::<Vec<_>>().into(): Rc<[T]>`.

Moreover, this PR does some refactoring in some places.

r? @RalfJung for the code
cc @alexcrichton from T-libs
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commented Jul 12, 2019

💔 Test failed - checks-azure

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commented Jul 12, 2019

@bors retry

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commented Jul 13, 2019

⌛️ Testing commit 85def30 with merge 4a95e97...

bors added a commit that referenced this pull request Jul 13, 2019
Add `impl<T> FromIterator<T> for Arc/Rc<[T]>`

Add implementations of `FromIterator<T> for Arc/Rc<[T]>` with symmetrical logic.

This also takes advantage of specialization in the case of iterators with known length (`TrustedLen`) to elide the final allocation/copying from a `Vec<T>` into `Rc<[T]>` because we can allocate the space for the `Rc<[T]>` directly when the size is known. This is the primary motivation and why this is to be preferred over `iter.collect::<Vec<_>>().into(): Rc<[T]>`.

Moreover, this PR does some refactoring in some places.

r? @RalfJung for the code
cc @alexcrichton from T-libs
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commented Jul 13, 2019

☀️ Test successful - checks-azure, checks-travis, status-appveyor
Approved by: RalfJung
Pushing 4a95e97 to master...

@bors bors added the merged-by-bors label Jul 13, 2019
@bors bors merged commit 85def30 into rust-lang:master Jul 13, 2019
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@Centril Centril deleted the Centril:shared-from-iter branch Jul 13, 2019
netbsd-srcmastr pushed a commit to NetBSD/pkgsrc that referenced this pull request Oct 2, 2019
Pkgsrc changes:
 * Adapt to the move of the implementation of random numbers.
 * Remove patch which is no longer relevant (Signals.inc)
 * Cross-build currently fails due to the still unresolved
   rust-lang/rust#62558, so bootstrap
   kits for 1.38.0 have to be built natively, and will follow shortly.
 * Bump bootstrap requirements to 1.37.0 except for armv7-unknown-netbsd-eabihf
   which I've neither managed to cross-build nor build natively.

Upstream changes:

Version 1.38.0 (2019-09-26)
==========================

Language
--------
- [The `#[global_allocator]` attribute can now be used in submodules.][62735]
- [The `#[deprecated]` attribute can now be used on macros.][62042]

Compiler
--------
- [Added pipelined compilation support to `rustc`.][62766] This will
  improve compilation times in some cases. For further information please refer
  to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals]
  thread.
- [Added tier 3\* support for the `aarch64-uwp-windows-msvc`,
  `i686-uwp-windows-gnu`, `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`,
  and `x86_64-uwp-windows-msvc` targets.][60260]
- [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
  `armv7-unknown-linux-musleabi` targets.][63107]
- [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
- [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]

\* Refer to Rust's [platform support page][forge-platform-support] for more
information on Rust's tiered platform support.

Libraries
---------
- [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
- [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
  available at the same path as the trait.][63056] (e.g. The `Clone` derive
  macro is available at `std::clone::Clone`). This also makes all built-in
  macros available in `std`/`core` root. e.g. `std::include_bytes!`.
- [`str::Chars` now implements `Debug`.][63000]
- [`slice::{concat, connect, join}` now accepts `&[T]` in addition to
   `&T`.][62528]
- [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
- [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
- [Added euclidean remainder and division operations (`div_euclid`,
  `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
  `overflowing`, and `wrapping` versions are available for all
  integer primitives.
- [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
  `PartialEq`.][61491]
- [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]

Stabilized APIs
---------------
- [`<*const T>::cast`]
- [`<*mut T>::cast`]
- [`Duration::as_secs_f32`]
- [`Duration::as_secs_f64`]
- [`Duration::div_duration_f32`]
- [`Duration::div_duration_f64`]
- [`Duration::div_f32`]
- [`Duration::div_f64`]
- [`Duration::from_secs_f32`]
- [`Duration::from_secs_f64`]
- [`Duration::mul_f32`]
- [`Duration::mul_f64`]
- [`any::type_name`]

Cargo
-----
- [Added pipelined compilation support to `cargo`.][cargo/7143]
- [You can now pass the `--features` option multiple times to enable
  multiple features.][cargo/7084]

Misc
----
- [`rustc` will now warn about some incorrect uses of
  `mem::{uninitialized, zeroed}` that are known to cause undefined
  behaviour.][63346]

Compatibility Notes
-------------------
- Unfortunately the [`x86_64-unknown-uefi` platform can not be built][62785]
  with rustc 1.39.0.
- The [`armv7-unknown-linux-gnueabihf` platform is also known to have
  issues][62896] for certain crates such as libc.

[60260]: rust-lang/rust#60260
[61457]: rust-lang/rust#61457
[61491]: rust-lang/rust#61491
[61884]: rust-lang/rust#61884
[61953]: rust-lang/rust#61953
[62042]: rust-lang/rust#62042
[62528]: rust-lang/rust#62528
[62583]: rust-lang/rust#62583
[62735]: rust-lang/rust#62735
[62766]: rust-lang/rust#62766
[62784]: rust-lang/rust#62784
[62785]: rust-lang/rust#62785
[62814]: rust-lang/rust#62814
[62896]: rust-lang/rust#62896
[63000]: rust-lang/rust#63000
[63056]: rust-lang/rust#63056
[63107]: rust-lang/rust#63107
[63346]: rust-lang/rust#63346
[63421]: rust-lang/rust#63421
[cargo/7084]: rust-lang/cargo#7084
[cargo/7143]: rust-lang/cargo#7143
[`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
[`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
[`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
[`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
[`Duration::div_duration_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_duration_f32
[`Duration::div_duration_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_duration_f64
[`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
[`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
[`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
[`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
[`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
[`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
[`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
[forge-platform-support]: https://forge.rust-lang.org/platform-support.html
[pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
netbsd-srcmastr pushed a commit to NetBSD/pkgsrc that referenced this pull request Oct 18, 2019
Pkgsrc changes:
 * Adapt to the move of the implementation of random numbers.
 * Remove patch which is no longer relevant (Signals.inc)
 * Cross-build currently fails due to the still unresolved
   rust-lang/rust#62558, so bootstrap
   kits for 1.38.0 have to be built natively, and will follow shortly.
 * Bump bootstrap requirements to 1.37.0 except for armv7-unknown-netbsd-eabihf
   which I've neither managed to cross-build nor build natively.

Upstream changes:

Version 1.38.0 (2019-09-26)
==========================

Language
--------
- [The `#[global_allocator]` attribute can now be used in submodules.][62735]
- [The `#[deprecated]` attribute can now be used on macros.][62042]

Compiler
--------
- [Added pipelined compilation support to `rustc`.][62766] This will
  improve compilation times in some cases. For further information please refer
  to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals]
  thread.
- [Added tier 3\* support for the `aarch64-uwp-windows-msvc`,
  `i686-uwp-windows-gnu`, `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`,
  and `x86_64-uwp-windows-msvc` targets.][60260]
- [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
  `armv7-unknown-linux-musleabi` targets.][63107]
- [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
- [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]

\* Refer to Rust's [platform support page][forge-platform-support] for more
information on Rust's tiered platform support.

Libraries
---------
- [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
- [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
  available at the same path as the trait.][63056] (e.g. The `Clone` derive
  macro is available at `std::clone::Clone`). This also makes all built-in
  macros available in `std`/`core` root. e.g. `std::include_bytes!`.
- [`str::Chars` now implements `Debug`.][63000]
- [`slice::{concat, connect, join}` now accepts `&[T]` in addition to
   `&T`.][62528]
- [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
- [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
- [Added euclidean remainder and division operations (`div_euclid`,
  `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
  `overflowing`, and `wrapping` versions are available for all
  integer primitives.
- [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
  `PartialEq`.][61491]
- [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]

Stabilized APIs
---------------
- [`<*const T>::cast`]
- [`<*mut T>::cast`]
- [`Duration::as_secs_f32`]
- [`Duration::as_secs_f64`]
- [`Duration::div_duration_f32`]
- [`Duration::div_duration_f64`]
- [`Duration::div_f32`]
- [`Duration::div_f64`]
- [`Duration::from_secs_f32`]
- [`Duration::from_secs_f64`]
- [`Duration::mul_f32`]
- [`Duration::mul_f64`]
- [`any::type_name`]

Cargo
-----
- [Added pipelined compilation support to `cargo`.][cargo/7143]
- [You can now pass the `--features` option multiple times to enable
  multiple features.][cargo/7084]

Misc
----
- [`rustc` will now warn about some incorrect uses of
  `mem::{uninitialized, zeroed}` that are known to cause undefined
  behaviour.][63346]

Compatibility Notes
-------------------
- Unfortunately the [`x86_64-unknown-uefi` platform can not be built][62785]
  with rustc 1.39.0.
- The [`armv7-unknown-linux-gnueabihf` platform is also known to have
  issues][62896] for certain crates such as libc.

[60260]: rust-lang/rust#60260
[61457]: rust-lang/rust#61457
[61491]: rust-lang/rust#61491
[61884]: rust-lang/rust#61884
[61953]: rust-lang/rust#61953
[62042]: rust-lang/rust#62042
[62528]: rust-lang/rust#62528
[62583]: rust-lang/rust#62583
[62735]: rust-lang/rust#62735
[62766]: rust-lang/rust#62766
[62784]: rust-lang/rust#62784
[62785]: rust-lang/rust#62785
[62814]: rust-lang/rust#62814
[62896]: rust-lang/rust#62896
[63000]: rust-lang/rust#63000
[63056]: rust-lang/rust#63056
[63107]: rust-lang/rust#63107
[63346]: rust-lang/rust#63346
[63421]: rust-lang/rust#63421
[cargo/7084]: rust-lang/cargo#7084
[cargo/7143]: rust-lang/cargo#7143
[`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
[`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
[`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
[`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
[`Duration::div_duration_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_duration_f32
[`Duration::div_duration_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_duration_f64
[`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
[`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
[`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
[`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
[`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
[`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
[`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
[forge-platform-support]: https://forge.rust-lang.org/platform-support.html
[pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
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