[Motions 2026 03 cwg 2] P4160R0 DR issues except <long list> by burblebee · Pull Request #8922 · cplusplus/draft

burblebee · 2026-04-06T06:01:58Z

Also fixes cplusplus/nbballot#606
Also fixes cplusplus/nbballot#605
Also fixes cplusplus/nbballot#604

Notes:

CWG2660: Not applied (already fixed by A. Jiang in 35904b9).
CWG2765: Targeted text in [expr.const] moved to [expr.const.core].
CWG2983: The 2nd sentence of [basic.pre]p7 is no longer present.

tkoeppe · 2026-04-06T12:55:27Z

Thanks a lot, @burblebee! Is this ready? (The PR is still in "draft" mode.)

source/intro.tex

source/basic.tex

jensmaurer · 2026-04-07T10:59:49Z

CWG2660: Not applied (text rewritten by CWG2813).

While this is superficially true, the offending phase "this parameter of the function (7.5.3 [expr.prim.this]) is initialized with a pointer to the object of the call" still exists post-CWG2813. Please apply CWG2660 to that part.

jensmaurer · 2026-04-07T11:21:32Z

I have added "fixes cplusplus/nbballot" links in the initial comment of this pull request. It would be good to amend the corresponding commits with our usual "Fixes NB ... (C++26 CD)." text (examples all over "git log").

tkoeppe · 2026-04-07T11:43:47Z

There are 32 issues in Motion 2. Issue 3127 makes no changess.

@burblebee What about CWG2660?

burblebee · 2026-04-07T11:44:45Z

CWG2660: Not applied (text rewritten by CWG2813).

While this is superficially true, the offending phase "this parameter of the function (7.5.3 [expr.prim.this]) is initialized with a pointer to the object of the call" still exists post-CWG2813. Please apply CWG2660 to that part.

Sorry, I referenced the wrong commit - the "this" pointer was fixed in by A. Jiang in 35904b9. I'll fix my note.

tkoeppe · 2026-04-07T11:52:57Z

Ah, great, thanks!

burblebee · 2026-04-07T12:08:00Z

I have added "fixes cplusplus/nbballot" links in the initial comment of this pull request. It would be good to amend the corresponding commits with our usual "Fixes NB ... (C++26 CD)." text (examples all over "git log").

Sorry, I totally missed those! The way they're formatted is too subtle; they look like part of the date. I seem to remember them being a lot more obvious.

I see - we now have a link where we used to have big, bold, black letters, right? The link is nice - thanks for doing that.

Can we do something to make the NB issues more obvious in the future? Maybe add a new, separate field for them, further away from the date? And, if possible, use a big bold font for the text of the link?

jensmaurer · 2026-04-07T12:43:58Z

Sorry, I totally missed those! The way they're formatted is too subtle; they look like part of the date. I seem to remember them being a lot more obvious.

We used to have links in former times, too; I've used the existing XML machinery in the issues list (the deep links to the C++26 NB comments don't actually work). Compare these examples:

C++26: https://cplusplus.github.io/CWG/issues/3171.html
C++23: https://cplusplus.github.io/CWG/issues/2659.html
C++14: https://cplusplus.github.io/CWG/issues/1786.html
(maybe we didn't create core issues for NB comments in between, and instead used separate omnibus papers)

burblebee · 2026-04-07T13:09:49Z

Sorry, I totally missed those! The way they're formatted is too subtle; they look like part of the date. I seem to remember them being a lot more obvious.

We used to have links in former times, too; I've used the existing XML machinery in the issues list (the links to the C++26 don't actually work). Compare these examples:

C++26: https://cplusplus.github.io/CWG/issues/3171.html

C++23: https://cplusplus.github.io/CWG/issues/2659.html

C++14: https://cplusplus.github.io/CWG/issues/1786.html
(maybe we didn't create core issues for NB comments in between, and instead used separate omnibus papers)

Thanks for those references, I can see what made the NB issues more obvious - they were in the 1st column and separated from the usual fields by a newline.

jensmaurer · 2026-04-07T14:56:06Z

I can see what made the NB issues more obvious - they were in the 1st column and separated from the usual fields by a newline.

Again, I fail to see a material visual difference between "this round" and "last round":

tkoeppe · 2026-04-07T20:07:55Z

Thanks Dawn and Jens for sorting out the NB comment associations!

burblebee · 2026-04-07T22:21:54Z

I can see what made the NB issues more obvious - they were in the 1st column and separated from the usual fields by a newline.

Again, I fail to see a material visual difference between "this round" and "last round":

The browser I'm using (Safari) shows something very different for "this round" - the NB comments appear directly left of the Date: entry. Whereas I do see what you see for "last round".

I'd embed an image of what I see but I don't know how you did that (neat!) - hopefully you can see what I mean from the following:

3058. "Program point" is not defined

Section: 6.5.1  [[basic.lookup.general](https://wg21.link/basic.lookup.general)]     Status: ready     Submitter: Alisdair Meredith     Date: 2025-08-13 [N5028 comment US 14-029](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2025/n5028.pdf#US14-029)
(From submission [#749](https://github.com/cplusplus/CWG/issues/749).)

There is no definition for the term "program point".

For now, did I find them all? I only saw 2 issues with NB comments in this motion.

FYI - I tried in FireFox and Brave (a Chrome-like browser) and don't see those extra newlines that you see, so I guess it's a Mac issue?? Interesting... Just looked this up and apparently a known bug. Now that I know I'll try to remember to look in the future. Sorry to bother you!!!

…ring constant evaluation

…lity

…ory areas

Fixes NB US 14-029 (C++26 CD).

This avoids starting a sentence with a symbol, and it is also consistent with other nearby descriptions.

Editorial note: * In new wording from previous CWG3130, which added a new reference to "X" in [class.default.ctor], change "X" to "the class", since the change from CWG3148 removes the name "X".

…template matching

Fixes NB US 17-030, FR 003-031 (C++26 CD).

eisenwave added this to the post-2026-03 milestone Apr 6, 2026

tkoeppe reviewed Apr 6, 2026

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burblebee marked this pull request as ready for review April 7, 2026 10:23

burblebee force-pushed the motions-2026-03-cwg-2 branch 2 times, most recently from 325d3e8 to 3a5222d Compare April 7, 2026 12:50

burblebee added 2 commits April 8, 2026 12:57

CWG2609 Padding in class types

68767ea

CWG2744 Multiple objects of the same type at the same address

5d6e9c8

tkoeppe force-pushed the motions-2026-03-cwg-2 branch from 3a5222d to c114a77 Compare April 11, 2026 23:11

burblebee added 8 commits April 12, 2026 00:26

CWG2765 Address comparisons between potentially non-unique objects du…

adcdd79

…ring constant evaluation

CWG2799 Inheriting default constructors

5d65e7f

CWG2947 Limiting macro expansion in pp-module

c2f1ab8

CWG2966 Alignment and value representation of std::nullptr_t

7e8fea5

CWG2976 Transferring control out of a function

c3fbb89

CWG2983 Non-type template parameters are not variables

2821d9c

CWG2992 Labels do not have names

660f75c

CWG3010 constexpr placement-new should require transparent replaceabi…

c706a4e

…lity

burblebee and others added 13 commits April 12, 2026 00:26

CWG3029 Confusing note about ordinary character types for aligned mem…

ff3d471

…ory areas

CWG3035 Lambda expressions in anonymous unions

e35e7c2

CWG3058 "Program point" is not defined

13209c7

Fixes NB US 14-029 (C++26 CD).

CWG3125 Token convertibility requirement in #if

6181aa6

CWG3126 A module import needs a header-name as a token

3dfbe43

CWG3128 Potentially-throwing unevaluated operands

4a2eed2

CWG3129 Clarify which floating-point-literals are valid

7f818ad

CWG3130 Naming function members of anonymous unions

931cad9

CWG3132 Unclear disambiguation rule for condition

29022b7

CWG3133 Cv-qualified types in built-in operator candidates

d339a26

CWG3136 Constant expressions of type void

870aab7

CWG3142 Possible expansions of __LINE__ changing over time

20e988a

[cpp.predefined] Insert "The integer literal" as introducer.

c25b52e

This avoids starting a sentence with a symbol, and it is also consistent with other nearby descriptions.

tkoeppe force-pushed the motions-2026-03-cwg-2 branch from c114a77 to 5798c64 Compare April 11, 2026 23:26

burblebee added 8 commits April 12, 2026 00:52

CWG3148 Definition of "user-declared" special member function

30b9804

Editorial note: * In new wording from previous CWG3130, which added a new reference to "X" in [class.default.ctor], change "X" to "the class", since the change from CWG3148 removes the name "X".

CWG3151 Closure types that are final

383e447

CWG3153 Immediate-escalating defaulted comparison

e3b6062

CWG3155 Escalation of virtual functions

a0b9b3b

CWG3156 Handling of deleted functions in unevaluated lambda-captures

8c7d950

CWG3157 Missing handling of operator new[] for deallocation function …

9959c52

…template matching

CWG3171 Codify the strong ownership for modules

9b822e3

Fixes NB US 17-030, FR 003-031 (C++26 CD).

CWG3173 Remove misleading footnote about as-if rule

30d255b

tkoeppe force-pushed the motions-2026-03-cwg-2 branch from 5798c64 to 30d255b Compare April 11, 2026 23:54

tkoeppe merged commit e6a0efe into main Apr 12, 2026
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