From: janosch84@gmail.com
To: ruby-core@ruby-lang.org
Subject: [ruby-core:92459] [Ruby trunk Bug#15807] Range#minmax is slow and never returns for endless ranges
Date: Sun, 28 Apr 2019 12:14:11 +0000 (UTC) [thread overview]
Message-ID: <redmine.issue-15807.20190428121410.131bc692c73e1b34@ruby-lang.org> (raw)
In-Reply-To: redmine.issue-15807.20190428121410@ruby-lang.org
Issue #15807 has been reported by janosch-x (Janosch Müller).
----------------------------------------
Bug #15807: Range#minmax is slow and never returns for endless ranges
https://bugs.ruby-lang.org/issues/15807
* Author: janosch-x (Janosch Müller)
* Status: Open
* Priority: Normal
* Assignee:
* Target version:
* ruby -v: 2.6.3p62
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
current situation:
- `(1..).minmax` runs forever
- `(1..).max` raises "cannot get the maximum of endless range"
- `(1..Float::INFINITY).minmax` runs forever
- `(1..Float::INFINITY).max` returns instantly
- `(1..1_000_000_000).minmax` takes one minute
- `(1..1_000_000_000).max` returns instantly
my suggestion:
- implement `minmax` in range.c, return [`range_min`, `range_max`]
- for endless ranges, this will trigger the same error as `max` does
- delegate to enum (rb_call_super) only if called with a block (?)
i could perhaps provide a PR if you can point me to some information on how to contribute.
cheers!
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next parent reply other threads:[~2019-04-28 12:14 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <redmine.issue-15807.20190428121410@ruby-lang.org>
2019-04-28 12:14 ` janosch84 [this message]
2019-04-28 12:32 ` [ruby-core:92461] [Ruby trunk Bug#15807] Range#minmax is slow and never returns for endless ranges mame
2019-04-28 14:29 ` [ruby-core:92463] " janosch84
2019-05-31 19:31 ` [ruby-core:92916] " mohsen
2019-06-08 5:24 ` [ruby-core:93021] " merch-redmine
2019-06-15 9:50 ` [ruby-core:93156] " janosch84
2019-06-16 13:26 ` [ruby-core:93181] " janosch84
2019-06-18 14:08 ` [ruby-core:93224] " eregontp
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