Issue 2884: Relational operators for containers should sfinae; if the underlying type is not comparable, neither should the container be

Title: Relational operators for containers should sfinae; if the underlying type is not comparable, neither should the container be
Status: nad
Section: [containers][utilities]
Submitter: Finland

Created on 2017-02-03.00:00:00 last changed 2 days ago

Messages

Date: 2026-06-09.13:59:08

[ Brno 2026-06-09 Status changed: LEWG → NAD. ]

LEWG recommended closing as NAD. This is difficult in general because of support for incomplete types in some containers.

msg15331 (view)

Date: 2025-10-15.00:00:00

[ 2025-10-21; Priority set to 4 based on age of issue and lack of activity. ]

msg9303 (view)

Date: 2017-06-27.00:00:00

[ 2017-06-27 Moved to LEWG after 5 positive votes on c++std-lib. ]

msg8928 (view)

Date: 2017-02-03.00:00:00

Addresses FI 16

Relational operators for containers should sfinae; if the underlying type is not comparable, neither should the container be. Same applies to tuple and pair.

Proposed change: Make the relational operators of containers and utility components reflect the validity of the underlying element types.

History
Date	User	Action	Args
2026-06-09 13:59:08	admin	set	messages: + msg16378
2026-06-09 13:59:08	admin	set	status: lewg -> nad
2025-10-21 15:20:04	admin	set	messages: + msg15331
2017-06-27 21:09:58	admin	set	messages: + msg9303
2017-06-27 21:09:58	admin	set	status: new -> lewg
2017-02-03 00:00:00	admin	create