CWG2507: Default arguments for operator[]

[jensmaurer]

CWG would like EWG to confirm that default arguments were intended to be permitted for an operator[] function. See P2128R6 for the paper removing restrictions on overloaded operator[].

See CWG2507:

The adopted wording did not address the following restriction from 12.4.1 [over.oper.general] paragraph 10:

An operator function cannot have default arguments (9.3.4.7 [dcl.fct.default]), except where explicitly stated below.

[erichkeane]

EWG Discussed this issue during the April 14, 2022 telecon. The following poll was taken:

Instruct core to resolve CWG2507 as proposed in the issue for C++23.

SF	F	N	A	SA
8	4	1	0	0

Result: Consensus

Based on feedback and results, the EWG chair encourages CWG to act on this immediately, and this will not be sent to electronic polling.

[jensmaurer]

CWG telecon 2022-04-22: Approved for plenary vote.