From: "byroot (Jean Boussier) via ruby-core" <ruby-core@ml.ruby-lang.org>
To: ruby-core@ml.ruby-lang.org
Cc: "byroot (Jean Boussier)" <noreply@ruby-lang.org>
Subject: [ruby-core:117322] [Ruby master Feature#19236] Allow to create hashes with a specific capacity from Ruby
Date: Tue, 26 Mar 2024 07:20:30 +0000 (UTC) [thread overview]
Message-ID: <redmine.journal-107465.20240326072030.7941@ruby-lang.org> (raw)
In-Reply-To: redmine.issue-19236.20221215090219.7941@ruby-lang.org
Issue #19236 has been updated by byroot (Jean Boussier).
Implemented `Hash.new(capacity:)` in https://github.com/ruby/ruby/pull/10357
----------------------------------------
Feature #19236: Allow to create hashes with a specific capacity from Ruby
https://bugs.ruby-lang.org/issues/19236#change-107465
* Author: byroot (Jean Boussier)
* Status: Open
----------------------------------------
Followup on [Feature #18683] which added a C-API for this purpose.
Various protocol parsers such as Redis `RESP3` or `msgpack`, have to create hashes, and they know the size in advance.
For efficiency, it would be preferable if they could directly allocate a Hash of the necessary size, so that large hashes wouldn't cause many re-alloccations and re-hash.
`String` and `Array` both already offer similar APIs:
```ruby
String.new(capacity: XXX)
Array.new(XX) / rb_ary_new_capa(long)
```
However there's no such public API for Hashes in Ruby land.
### Proposal
I think `Hash` should have a way to create a new hash with a `capacity` parameter.
The logical signature of `Hash.new(capacity: 1000)` was deemed too incompatible in [Feature #18683].
@Eregon proposed to add `Hash.create(capacity: 1000)`.
--
https://bugs.ruby-lang.org/
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prev parent reply other threads:[~2024-03-26 7:20 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-15 9:02 [ruby-core:111306] [Ruby master Feature#19236] Allow to create hashes with a specific capacity from Ruby byroot (Jean Boussier)
2022-12-25 17:16 ` [ruby-core:111425] " janosch-x via ruby-core
2023-01-20 5:31 ` [ruby-core:111919] " mame (Yusuke Endoh) via ruby-core
2023-01-20 8:42 ` [ruby-core:111931] " byroot (Jean Boussier) via ruby-core
2023-01-23 2:47 ` [ruby-core:111983] " mame (Yusuke Endoh) via ruby-core
2023-01-24 14:23 ` [ruby-core:112008] " Eregon (Benoit Daloze) via ruby-core
2023-05-05 23:59 ` [ruby-core:113408] " Dan0042 (Daniel DeLorme) via ruby-core
2023-05-06 5:31 ` [ruby-core:113412] " ianks (Ian Ker-Seymer) via ruby-core
2023-05-06 5:39 ` [ruby-core:113413] " byroot (Jean Boussier) via ruby-core
2023-05-09 12:57 ` [ruby-core:113434] " Dan0042 (Daniel DeLorme) via ruby-core
2023-05-19 10:04 ` [ruby-core:113528] " byroot (Jean Boussier) via ruby-core
2023-05-23 10:44 ` [ruby-core:113598] " byroot (Jean Boussier) via ruby-core
2023-05-23 13:53 ` [ruby-core:113600] " byroot (Jean Boussier) via ruby-core
2024-03-26 7:20 ` byroot (Jean Boussier) via ruby-core [this message]
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