This page is a snapshot from the LWG issues list, see the Library Active Issues List for more information and the meaning of C++11 status.
Section: 27.6.12 [alg.is.permutation] Status: C++11 Submitter: INCITS Opened: 2010-08-25 Last modified: 2021-06-06
Priority: Not Prioritized
View all issues with C++11 status.
is_permutation is underspecified for anything but the simple case where both ranges have the same value type and the comparison function is an equivalence relation.
[ Resolved in Rapperswil by a motion to directly apply the words from the ballot comment in N3102. ]
Restrict is_permutation to the case where it is well specified. See Appendix 1 - Additional Details