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A (failed) attempt to implement "Prefetching" #46

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A (failed) attempt to implement "Prefetching" #46

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@torkleyy torkleyy commented Aug 5, 2017

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torkleyy commented Aug 5, 2017

The problem is that one can fetch SystemData<'a> (with any 'a) from Resources, but not from Prefetch, since that is bound by the field of the system struct.

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torkleyy commented Aug 5, 2017

There is probably a solution do this in current Rust, but it's probably ugly. Or there is a nice one, which I don't see.

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torkleyy commented Aug 5, 2017
View reviewed changes
examples/prefetch.rs
fn main() {
let mut resources = Resources::new();
let mut dispatcher = DispatcherBuilder::new()
.add(PrintSystem::new(&resources), "print", &[]) // Adds a system "print" without dependencies
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That's the idea here: we get the cell from the resources on initialization, so there is no need for hash map access anymore.

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Closing because after #69 and #75 the access is pretty fast and this feature can't be implement safely with current Rust.

@torkleyy torkleyy closed this Feb 11, 2018
bors bot added a commit that referenced this pull request Apr 3, 2019
@bors @dependabot-support
Merge #126
4b8c02b 
126: Update hashbrown requirement from 0.1.7 to 0.2.0 r=torkleyy a=dependabot[bot]

Updates the requirements on [hashbrown](https://github.com/Amanieu/hashbrown) to permit the latest version.
<details>
<summary>Changelog</summary>

*Sourced from [hashbrown's changelog](https://github.com/Amanieu/hashbrown/blob/master/CHANGELOG.md).*

> ## [v0.2.0] - 2019-03-31
> 
> ### Changed
> - The code has been updated to Rust 2018 edition. This means that the minimum
>   Rust version has been bumped to 1.31 (2018 edition).
> 
> ### Added
> - Added `insert_with_hasher` to the raw_entry API to allow `K: !(Hash + Eq)`. ([#54](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/54))
> - Added support for using hashbrown as the hash table implementation in libstd. ([#46](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/46))
> 
> ### Fixed
> - Fixed cargo build with minimal-versions. ([#45](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/45))
> - Fixed `#[may_dangle]` attributes to match the libstd `HashMap`. ([#46](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/46))
> - ZST keys and values are now handled properly. ([#46](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/46))
> 
> ## [v0.1.8] - 2019-01-14
> 
> ### Added
> - Rayon parallel iterator support ([#37](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/37))
> - `raw_entry` support ([#31](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/31))
> - `#[may_dangle]` on nightly ([#31](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/31))
> - `try_reserve` support ([#31](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/31))
> 
> ### Fixed
> - Fixed variance on `IterMut`. ([#31](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/31))
> 
> ## [v0.1.7] - 2018-12-05
> 
> ### Fixed
> - Fixed non-SSE version of convert_special_to_empty_and_full_to_deleted. ([#32](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/32))
> - Fixed overflow in rehash_in_place. ([#33](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/33))
> 
> ## [v0.1.6] - 2018-11-17
> 
> ### Fixed
> - Fixed compile error on nightly. ([#29](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/29))
> 
> ## [v0.1.5] - 2018-11-08
> 
> ### Fixed
> - Fixed subtraction overflow in generic::Group::match_byte. ([#28](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/28))
> 
> ## [v0.1.4] - 2018-11-04
> 
> ### Fixed
> - Fixed a bug in the `erase_no_drop` implementation. ([#26](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/26))
> 
> ## [v0.1.3] - 2018-11-01
> 
> ### Added
></tr></table> ... (truncated)
</details>
<details>
<summary>Commits</summary>

- [`af90bc9`](Amanieu/hashbrown@af90bc9) Version 0.2.0
- [`83ce3d5`](Amanieu/hashbrown@83ce3d5) Merge [#46](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/46)
- [`f9bcc42`](Amanieu/hashbrown@f9bcc42) Add #[may_dangle] to RawIntoIter
- [`b11f8cd`](Amanieu/hashbrown@b11f8cd) Upgrade to 2018 edition
- [`2bd15ed`](Amanieu/hashbrown@2bd15ed) Apply feedback from https://github-redirect.dependabot.com/rust-lang/rust/pull/56241
- [`91d3e4a`](Amanieu/hashbrown@91d3e4a) Merge [#55](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/55)
- [`49a9d6c`](Amanieu/hashbrown@49a9d6c) use --exclude-should-panic
- [`c36d49a`](Amanieu/hashbrown@c36d49a) install Miri via rustup
- [`332db4d`](Amanieu/hashbrown@332db4d) Prepare hashbrown for inclusion in the standard library
- [`edf79d0`](Amanieu/hashbrown@edf79d0) Merge [#54](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/54)
- Additional commits viewable in [compare view](Amanieu/hashbrown@v0.1.7...v0.2.0)
</details>
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bors bot added a commit that referenced this pull request Apr 23, 2019
@bors @dependabot-support
Merge #135
3a37bc6 
135: Update hashbrown requirement from 0.2.0 to 0.3.0 r=torkleyy a=dependabot[bot]

Updates the requirements on [hashbrown](https://github.com/Amanieu/hashbrown) to permit the latest version.
<details>
<summary>Changelog</summary>

*Sourced from [hashbrown's changelog](https://github.com/Amanieu/hashbrown/blob/master/CHANGELOG.md).*

> ## [v0.3.0] - 2019-04-23
> 
> ### Changed
> - Changed shrink_to to not panic if min_capacity < capacity. ([#67](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/67))
> 
> ### Fixed
> - Worked around emscripten bug emscripten-core/emscripten-fastcomp#258. ([#66](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/66))
> 
> ## [v0.2.2] - 2019-04-16
> 
> ### Fixed
> - Inlined non-nightly lowest_set_bit_nonzero. ([#64](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/64))
> - Fixed build on latest nightly. ([#65](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/65))
> 
> ## [v0.2.1] - 2019-04-14
> 
> ### Changed
> - Use for_each in map Extend and FromIterator. ([#58](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/58))
> - Improved worst-case performance of HashSet.is_subset. ([#61](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/61))
> 
> ### Fixed
> - Removed incorrect debug_assert. ([#60](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/60))
> 
> ## [v0.2.0] - 2019-03-31
> 
> ### Changed
> - The code has been updated to Rust 2018 edition. This means that the minimum
>   Rust version has been bumped to 1.31 (2018 edition).
> 
> ### Added
> - Added `insert_with_hasher` to the raw_entry API to allow `K: !(Hash + Eq)`. ([#54](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/54))
> - Added support for using hashbrown as the hash table implementation in libstd. ([#46](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/46))
> 
> ### Fixed
> - Fixed cargo build with minimal-versions. ([#45](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/45))
> - Fixed `#[may_dangle]` attributes to match the libstd `HashMap`. ([#46](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/46))
> - ZST keys and values are now handled properly. ([#46](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/46))
> 
> ## [v0.1.8] - 2019-01-14
> 
> ### Added
> - Rayon parallel iterator support ([#37](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/37))
> - `raw_entry` support ([#31](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/31))
> - `#[may_dangle]` on nightly ([#31](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/31))
> - `try_reserve` support ([#31](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/31))
> 
> ### Fixed
> - Fixed variance on `IterMut`. ([#31](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/31))
> 
> ## [v0.1.7] - 2018-12-05
></tr></table> ... (truncated)
</details>
<details>
<summary>Commits</summary>

- [`7e79b0c`](Amanieu/hashbrown@7e79b0c) Version 0.3.0
- [`7e2da14`](Amanieu/hashbrown@7e2da14) Merge [#67](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/67)
- [`8ec72d0`](Amanieu/hashbrown@8ec72d0) Change shrink_to to not panic if min_capacity < capacity
- [`ddf59a9`](Amanieu/hashbrown@ddf59a9) Merge [#66](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/66)
- [`6eddbe4`](Amanieu/hashbrown@6eddbe4) Work around emscripten bug emscripten-core/emscripten-fastcomp#258
- [`7dbd666`](Amanieu/hashbrown@7dbd666) Version 0.2.2
- [`12e8bb9`](Amanieu/hashbrown@12e8bb9) Merge [#64](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/64)
- [`a657af5`](Amanieu/hashbrown@a657af5) Merge [#65](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/65)
- [`373a9d4`](Amanieu/hashbrown@373a9d4) Fix warning on latest nightly
- [`79c5b41`](Amanieu/hashbrown@79c5b41) Inline non-nightly lowest_set_bit_nonzero
- Additional commits viewable in [compare view](Amanieu/hashbrown@v0.2.0...v0.3.0)
</details>
<br />

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bors bot added a commit that referenced this pull request Jun 1, 2019
@bors @dependabot-preview
Merge #142
cf82d3d 
142: Update hashbrown requirement from 0.3.0 to 0.4.0 r=torkleyy a=dependabot-preview[bot]

Updates the requirements on [hashbrown](https://github.com/rust-lang/hashbrown) to permit the latest version.
<details>
<summary>Changelog</summary>

*Sourced from [hashbrown's changelog](https://github.com/rust-lang/hashbrown/blob/master/CHANGELOG.md).*

> ## [v0.4.0] - 2019-05-30
> 
> ### Fixed
> - Fixed `Send` trait bounds on `IterMut` not matching the libstd one. ([#82](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/82))
> 
> ## [v0.3.1] - 2019-05-30
> 
> ### Fixed
> - Fixed incorrect use of slice in unsafe code. ([#80](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/80))
> 
> ## [v0.3.0] - 2019-04-23
> 
> ### Changed
> - Changed shrink_to to not panic if min_capacity < capacity. ([#67](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/67))
> 
> ### Fixed
> - Worked around emscripten bug emscripten-core/emscripten-fastcomp#258. ([#66](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/66))
> 
> ## [v0.2.2] - 2019-04-16
> 
> ### Fixed
> - Inlined non-nightly lowest_set_bit_nonzero. ([#64](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/64))
> - Fixed build on latest nightly. ([#65](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/65))
> 
> ## [v0.2.1] - 2019-04-14
> 
> ### Changed
> - Use for_each in map Extend and FromIterator. ([#58](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/58))
> - Improved worst-case performance of HashSet.is_subset. ([#61](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/61))
> 
> ### Fixed
> - Removed incorrect debug_assert. ([#60](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/60))
> 
> ## [v0.2.0] - 2019-03-31
> 
> ### Changed
> - The code has been updated to Rust 2018 edition. This means that the minimum
>   Rust version has been bumped to 1.31 (2018 edition).
> 
> ### Added
> - Added `insert_with_hasher` to the raw_entry API to allow `K: !(Hash + Eq)`. ([#54](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/54))
> - Added support for using hashbrown as the hash table implementation in libstd. ([#46](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/46))
> 
> ### Fixed
> - Fixed cargo build with minimal-versions. ([#45](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/45))
> - Fixed `#[may_dangle]` attributes to match the libstd `HashMap`. ([#46](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/46))
> - ZST keys and values are now handled properly. ([#46](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/46))
> 
> ## [v0.1.8] - 2019-01-14
> 
></tr></table> ... (truncated)
</details>
<details>
<summary>Commits</summary>

- [`987b962`](rust-lang/hashbrown@987b962) Version 0.4.0
- [`a9ddbcf`](rust-lang/hashbrown@a9ddbcf) Auto merge of [#82](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/82) - Amanieu:itermut_send, r=Amanieu
- [`a4eba4f`](rust-lang/hashbrown@a4eba4f) Fix the bounds on K for the Send impl of IterMut
- [`1889600`](rust-lang/hashbrown@1889600) Version 0.3.1
- [`c765ea0`](rust-lang/hashbrown@c765ea0) Auto merge of [#80](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/80) - RalfJung:raw, r=Amanieu
- [`2693d12`](rust-lang/hashbrown@2693d12) cast the entire slice to a raw pointer, not just the first element
- [`4368aa4`](rust-lang/hashbrown@4368aa4) Auto merge of [#78](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/78) - RalfJung:miri, r=Amanieu
- [`419f2ac`](rust-lang/hashbrown@419f2ac) skip Miri tests if the setup fails
- [`538d149`](rust-lang/hashbrown@538d149) Merge pull request [#77](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/77) from lzutao/refresh-doc
- [`70afa1b`](rust-lang/hashbrown@70afa1b) Use docs.rs badge
- Additional commits viewable in [compare view](rust-lang/hashbrown@v0.3.0...v0.4.0)
</details>
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Co-authored-by: dependabot-preview[bot] <dependabot-preview[bot]@users.noreply.github.com>
bors bot added a commit that referenced this pull request Jun 13, 2019
@bors @dependabot-preview
Merge #143
b5a3da4 
143: Update hashbrown requirement from 0.4.0 to 0.5.0 r=torkleyy a=dependabot-preview[bot]

Updates the requirements on [hashbrown](https://github.com/rust-lang/hashbrown) to permit the latest version.
<details>
<summary>Changelog</summary>

*Sourced from [hashbrown's changelog](https://github.com/rust-lang/hashbrown/blob/master/CHANGELOG.md).*

> ## [v0.5.0] - 2019-06-12
> 
> ### Fixed
> - Resize with a more conservative amount of space after deletions. ([#86](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/86))
> 
> ### Changed
> - Exposed the Layout of the failed allocation in CollectionAllocErr::AllocErr. ([#89](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/89))
> 
> ## [v0.4.0] - 2019-05-30
> 
> ### Fixed
> - Fixed `Send` trait bounds on `IterMut` not matching the libstd one. ([#82](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/82))
> 
> ## [v0.3.1] - 2019-05-30
> 
> ### Fixed
> - Fixed incorrect use of slice in unsafe code. ([#80](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/80))
> 
> ## [v0.3.0] - 2019-04-23
> 
> ### Changed
> - Changed shrink_to to not panic if min_capacity < capacity. ([#67](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/67))
> 
> ### Fixed
> - Worked around emscripten bug emscripten-core/emscripten-fastcomp#258. ([#66](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/66))
> 
> ## [v0.2.2] - 2019-04-16
> 
> ### Fixed
> - Inlined non-nightly lowest_set_bit_nonzero. ([#64](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/64))
> - Fixed build on latest nightly. ([#65](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/65))
> 
> ## [v0.2.1] - 2019-04-14
> 
> ### Changed
> - Use for_each in map Extend and FromIterator. ([#58](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/58))
> - Improved worst-case performance of HashSet.is_subset. ([#61](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/61))
> 
> ### Fixed
> - Removed incorrect debug_assert. ([#60](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/60))
> 
> ## [v0.2.0] - 2019-03-31
> 
> ### Changed
> - The code has been updated to Rust 2018 edition. This means that the minimum
>   Rust version has been bumped to 1.31 (2018 edition).
> 
> ### Added
> - Added `insert_with_hasher` to the raw_entry API to allow `K: !(Hash + Eq)`. ([#54](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/54))
> - Added support for using hashbrown as the hash table implementation in libstd. ([#46](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/46))
></tr></table> ... (truncated)
</details>
<details>
<summary>Commits</summary>

- [`e7cd4a5`](rust-lang/hashbrown@e7cd4a5) Version 0.5.0
- [`2c16341`](rust-lang/hashbrown@2c16341) Auto merge of [#89](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/89) - SimonSapin:layout, r=Amanieu
- [`c2e26e7`](rust-lang/hashbrown@c2e26e7) Expose the Layout of the failed allocation in CollectionAllocErr::AllocErr
- [`14bb115`](rust-lang/hashbrown@14bb115) Auto merge of [#87](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/87) - josephrocca:patch-1, r=Amanieu
- [`80dc544`](rust-lang/hashbrown@80dc544) Add simple usage code
- [`b240ee0`](rust-lang/hashbrown@b240ee0) Auto merge of [#86](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/86) - edre:rehash, r=Amanieu
- [`afc20d7`](rust-lang/hashbrown@afc20d7) Resize with a more conservative amount of space when inserting after deletions.
- [`119f429`](rust-lang/hashbrown@119f429) Auto merge of [#84](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/84) - edre:bench, r=Amanieu
- [`8783490`](rust-lang/hashbrown@8783490) Update insert_erase benchmark to keep the table size constant.
- [`143609d`](rust-lang/hashbrown@143609d) Auto merge of [#83](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/83) - edre:bench, r=Amanieu
- Additional commits viewable in [compare view](rust-lang/hashbrown@v0.4.0...v0.5.0)
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