[#99868] [Ruby master Bug#17144] Tempfile.open { ... } does not unlink the file — eregontp@...
Issue #17144 has been reported by Eregon (Benoit Daloze).
15 messages
2020/09/03
[ruby-core:100151] [Ruby master Feature#8948] Frozen regex
From:
ko1@...
Date:
2020-09-25 15:51:00 UTC
List:
ruby-core #100151
Issue #8948 has been updated by ko1 (Koichi Sasada).
I think at least interpolated regexp (`/a#{i}b/`) should be frozen though, like Range objects.
----------------------------------------
Feature #8948: Frozen regex
https://bugs.ruby-lang.org/issues/8948#change-87725
* Author: sawa (Tsuyoshi Sawada)
* Status: Assigned
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
----------------------------------------
=begin
I see that frozen string was accepted for Ruby 2.1, and frozen array and hash are proposed in https://bugs.ruby-lang.org/issues/8909. I feel there is even more use case for a frozen regex, i.e., a regex literal that generates a regex only once. It is frequent to have a regex within a frequently repeated portion of code, and generating the same regex each time is a waste of resource. At the moment, we can have a code like:
class Foo
RE1 = /pattern1/
RE2 = /pattern1/
RE3 = /pattern1/
def classify
case self
when RE1 then 1
when RE2 then 2
when RE3 then 3
else 4
end
end
end
but suppose we have a frozen `Regexp` literal `//f`. Then we can write like:
class Foo
def classify
case self
when /pattern1/f then 1
when /pattern1/f then 2
when /pattern1/f then 3
else 4
end
end
end
=end
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