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Bug #15834

closed

Mutating the result of SortedSet.to_a mutates the original set, potentially violating the set's guarantees

Added by viko (Viko Viko) over 5 years ago. Updated over 4 years ago.

Status:
Closed
Assignee:
knu (Akinori MUSHA)
Target version:
-
ruby -v:
ruby 2.6.3p62 (2019-04-16 revision 67580) [x86_64-darwin18]
Backport:
2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
[ruby-core:92578]
Tags:
patch, lib

Description

require 'set'

set = SortedSet[1, 2, 3]
set.to_a << -1
set.to_a << 3
set.each do |x|
  puts x
end

puts
set.add -2
set.each do |x|
  puts x
end

1
2
3
-1
3

-2
1
2
3

As can be seen, this breaks SortedSet's guarantee of ordering and Set's guarantee of uniqueness, besides being strange behaviour. Mutating the set normally undoes the changes. This bug only seems to exist for SortedSet, and not for Set itself. Workaround: dup.

Files

sorted-set-to_a-mutate-15834 (1.02 KB) sorted-set-to_a-mutate-15834 jeremyevans0 (Jeremy Evans), 10/27/2019 11:08 PM
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