Doc. no. | N4011
Date: | 2014-05-20
Project: | Programming Language C++
Reply to: | Ville Voutilainen <ville.voutilainen@gmail.com>

# C++ Standard Evolution Completed Issues List (Revision R07)

Revised 2014-05-20 at 12:05:51 UTC

Reference ISO/IEC IS 14882:2003(E)

Also see:

- Table of Contents for all evolution issues.
- Index by Section for all evolution issues.
- Index by Status for all evolution issues.
- Evolution Active Issues List
- Evolution Closed Issues List

This document contains only evolution issues which have been closed by the Evolution Working Group (EWG) after being found to be acceptable extensions to the standard. That is, issues which have a status of DR, TC1, WP, C++11, or Resolved. See the Evolution Closed Issues List for issues closed as non-defects. See the Evolution Active Issues List for active issues and more information. The introductory material in that document also applies to this document.

## Revision History

- R07: 2014-05-20 pre-Rapperswil mailing
  - Summary:
    - 86 open issues, up by 6.
    - 33 closed issues, up by 0.
    - 119 issues total, up by 6.
  - Details:
    - Added the following 5 New issues: 115, 116, 117, 118, 119.
    - Added the following Open issue: 114.
- R06:
  - R06: 2014-02-21 post-Issaquah mailing
    - Summary:
      - 80 open issues, up by 31.
      - 33 closed issues, up by 3.
      - 113 issues total, up by 34.
    - Details:
      - Added the following 3 NAD issues: 87, 97, 107.
      - Added the following 26 New issues: 83, 85, 88, 89, 90, 91, 92, 93, 94, 95, 96, 98, 99, 100, 101, 102, 103, 104, 105, 106, 108, 109, 110, 111, 112, 113.
      - Added the following 3 Open issues: 82, 84, 86.
      - Added the following 2 Ready issues: 80, 81.
- R05:
  - R05: 2014-01-17 pre-Issaquah mailing
    - Summary:
      - 49 open issues, up by 3.
      - 30 closed issues, up by 0.
      - 79 issues total, up by 3.
    - Details:
      - Added the following 3 New issues: 77, 78, 79.
      - Changed the following issue from New to Open: 72.
      - Changed the following issue from Ready to Open: 41.
- R04:
  - R04: 2013-10-11 post-Chicago mailing
    - Summary:
      - 46 open issues, down by 9.
      - 30 closed issues, up by 12.
      - 76 issues total, up by 3.
    - Details:
      - Added the following 3 Open issues: 74, 75, 76.
      - Changed the following 4 issues from New to NAD: 12, 68, 69, 73.
      - Changed the following 2 issues from Open to NAD: 32, 33.
      - Changed the following 6 issues from New to Open: 2, 17, 19, 23, 52, 71.
      - Changed the following 4 issues from Open to WP: 18, 21, 22, 27.
      - Changed the following 2 issues from Ready to WP: 3, 20.
- R03:
  - R03: 2013-08-27 pre-Chicago mailing
    - Summary:
      - 55 open issues, up by 7.
      - 18 closed issues, up by 0.
      - 73 issues total, up by 7.
    - Details:
      - Added the following 7 New issues: 67, 68, 69, 70, 71, 72, 73.
- R02: 2013-05-06 post-Bristol mailing
  - Summary:
    - 49 open issues, up by 2.
    - 18 closed issues, up by 17.
    - 67 issues total, up by 19.
  - Details:
    - Added the following 3 NAD issues: 53, 54, 55.
    - Added the following 6 New issues: 49, 50, 51, 52, 59, 65.
    - Added the following 7 Open issues: 56, 57, 58, 60, 63, 66, 66.
    - Added the following 3 WP issues: 61, 62, 64.
    - Changed the following 5 issues from New to NAD: 31, 36, 37, 38, 47.
    - Changed the following 8 issues from New to Open: 14, 30, 32, 33, 34, 35, 43, 48.
    - Changed the following 6 issues from New to Ready: 40, 41, 42, 44, 45, 46.
    - Changed the following 2 issues from Open to WP: 16, 25.
    - Changed the following 4 issues from Ready to WP: 1, 6, 7, 13.
- R01: 2013-03-18 Pre-Bristol mailing
  - Summary:
    - 47 open issues, up by 47.
    - 1 closed issues, up by 1.
    - 48 issues total, up by 48.
  - Details:
    - Added the following NAD issue: 39.
    - Added the following 32 New issues: 2, 5, 8, 10, 11, 12, 14, 15, 17, 19, 23, 24, 26, 28, 30, 31, 32, 33, 34, 35, 36, 37, 38, 40, 41, 42, 43, 44, 45, 46, 47, 48.
    - Added the following 9 Open issues: 4, 9, 16, 18, 21, 22, 25, 27, 29.
    - Added the following 6 Ready issues: 1, 3, 6, 7, 13, 20.

## Completed Issues

### 1. N3638, N3582, N3386 Return type deduction for normal functions

Section: 7.1.6.4 [dcl.spec.auto] Status: WP Submitter: Jason Merrill Opened: 2012-03-27 Last modified: 2014-05-19

View other active issues in [dcl.spec.auto].

View all other issues in [dcl.spec.auto].

View all issues with WP status.

Discussion:

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3386.html

http://open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3582.html

Reviewed by EWG in Portland 2012, proceeding to CWG.

Accepted into the Working Draft in Bristol 2013, as N3638.

Wording available:

The paper contains the proposed wording.

### 3. N3760, N3394 [[deprecated]] attribute

Section: 7.6 [dcl.attr] Status: WP Submitter: Alberto Ganesh Barbati Opened: 2012-06-12 Last modified: 2014-05-19

View all issues with WP status.

Discussion:

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3760.html

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3394.html

Reviewed by EWG in Portland 2012, proceeding to CWG.

Adopted in Chicago 2013

Wording available:

The paper contains the proposed wording.

### 6. N3667, N3401 Generating move operations (elaborating on Core 1402)

Section: 12.8 [class.copy] Status: WP Submitter: Ville Voutilainen Opened: 2012-09-21 Last modified: 2014-05-19

View all other issues in [class.copy].

View all issues with WP status.

Discussion:

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3401.html

Reviewed by EWG in Portland 2012, proceeding to CWG.

Accepted into the Working Draft in Bristol 2013, as N3667.

Wording available:

The related Core issue contains the proposed wording.

### 7. N3642, N3468, N3402 User-defined Literals for Standard Library Types, N3472 Binary Literals in the C++ Core Language

Section: 2.14.2 [lex.icon] Status: WP Submitter: Peter Sommerlad Opened: 2012-09-08 Last modified: 2014-05-19

View all issues with WP status.

Discussion:

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3402.pdf

http://open-std.org/JTC1/SC22/WG21/docs/papers/2012/n3468.pdf

http://open-std.org/JTC1/SC22/WG21/docs/papers/2012/n3472.pdf

Reviewed by EWG in Portland 2012, binary literals to be added into the core language, the rest of the paper is on LWG's plate. The binary literals are proceeding to CWG.

Accepted into the Working Draft in Bristol 2013, as N3642.

N3472 also accepted into the Working Draft in Bristol 2013.

Wording available:

The paper contains the Library wording, Dennett has written the Core wording (N3472) for binary literals.

### 13. N3639, N3497, N3467, N3412 Runtime-sized arrays with automatic storage duration

Section: 3.9 [basic.types] Status: WP Submitter: Jens Maurer Opened: 2012-09-19 Last modified: 2014-05-19

View all other issues in [basic.types].

View all issues with WP status.

Discussion:

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3412.html

http://open-std.org/JTC1/SC22/WG21/docs/papers/2012/n3467.html

http://open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3497.html

Reviewed by EWG in Portland 2012, proceeding to CWG. The library part is N2648 C++ Dynamic Arrays, and that part is proceeding to LWG.

Accepted into the Working Draft in Bristol 2013, as N3639.

Wording available:

The paper contains the proposed wording, as does the Library counterpart.

### 16. N3649, N3560, N3559, N3418 Proposal for Generic (Polymorphic) Lambda Expressions

Section: 5.1.2 [expr.prim.lambda] Status: WP Submitter: Faisal Vali Opened: 2012-09-21 Last modified: 2014-05-19

View all other issues in [expr.prim.lambda].

View all issues with WP status.

Discussion:

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3418.pdf

http://open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3559.pdf

http://open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3560.pdf

http://open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3649.html

Reviewed by EWG in Portland 2012, proceeding with a follow-up paper.

Accepted into the Working Draft in Bristol 2013, as N3649.

Bristol 2013: Do not re-open proposals 2.1 and 2.2 in N3560, they are considered NAD. The proposals 2.3 and 2.4 are covered by N3649.

### 18. N3424 Lambda Correctness and Usability Issues

Section: 5.1.2 [expr.prim.lambda] Status: WP Submitter: Herb Sutter Opened: 2012-09-23 Last modified: 2014-05-19

View all other issues in [expr.prim.lambda].

View all issues with WP status.

Discussion:

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3424.pdf

Reviewed by EWG in Portland 2012, proceeding with a follow-up paper. Changes to const captures rejected, capturing of 'this' and members encouraged to continue with a follow-up paper.

Init-captures in C++14 provide the necessary facilities for capturing 'this' and class members, voted into the WP in Bristol 2013.

### 20. N3778, N3663, N3536, N3432 C++ Sized Deallocation

Section: 3.7.4 [basic.stc.dynamic] Status: WP Submitter: Lawrence Crowl Opened: 2012-09-23 Last modified: 2014-05-19

View all other issues in [basic.stc.dynamic].

View all issues with WP status.

Discussion:

http://open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3663.html

http://open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3536.html

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3432.html

Reviewed by EWG in Portland 2012, proceeding to CWG.

Wording available:

The paper contains the proposed wording.

Adopted in the Chicago 2013 meeting as N3778.

### 21. N3664, N3537, N3433 Clarifying Memory Allocation

Section: 3.7.4 [basic.stc.dynamic] Status: WP Submitter: Lawrence Crowl Opened: 2012-09-23 Last modified: 2014-05-19

View all other issues in [basic.stc.dynamic].

View all issues with WP status.

Discussion:

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3664.html

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3537.html

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3433.html

Reviewed by EWG in Portland 2012, proceeding with a follow-up paper.

Adopted in Bristol 2013

Wording available:

The paper contains the proposed wording.

### 22. N3745, N3694 Feature-testing recommendations for C++, N3435 Standardized feature-test macros

Section: 18.1 [support.general] Status: WP Submitter: Clark Nelson Opened: 2012-09-18 Last modified: 2014-05-19

View all other issues in [support.general].

View all issues with WP status.

Discussion:

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3745.htm

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3694.htm

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3435.htm

Reviewed by EWG in Portland 2012, proceeding in SG10, Feature Test.

Handled by SG10 to the first desired outcome in Chicago2013, no need for further EWG follow-up.

### 25. N3652, N3597, N3598, N3444 Relaxing syntactic constraints on constexpr function definitions

Section: 5.19 [expr.const] Status: WP Submitter: Richard Smith Opened: 2012-09-21 Last modified: 2014-05-19

View all other issues in [expr.const].

View all issues with WP status.

Discussion:

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3444.html

http://open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3597.html

http://open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3598.html

http://open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3652.html

Reviewed by EWG in Portland 2012, proceeding with a follow-up paper.

Accepted into the Working Draft in Bristol 2013, as N3652.

### 27. N3781 Single-Quotation-Mark as a Digit Separator, N3661, N3499 Digit Separators, N3448 Painless Digit Separation

Section: 2.10 [lex.ppnumber] Status: WP Submitter: Daveed Vandevoorde Opened: 2012-09-21 Last modified: 2014-05-19

View all issues with WP status.

Discussion:

http://open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3499.html

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3448.pdf

http://open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3661.html

http://open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3781.pdf

Reviewed by EWG in Portland 2012, proceeding with a follow-up paper.

Bristol 2013:

Straw poll:

Double radix point as the suffix disambiguator:

SF: 8 F: 5 N: 0 A: 0 SA: 0

Convey to Core, target C++14:

SF: 10 F: 3 N: 0 A: 0 SA: 0

The paper was not adopted in Bristol, because its motion didn't pass.

Adopted in Chicago 2013, as N3781.

Wording available:

The paper contains the proposed wording.

### 61. N3653, N3605 Member initializers and aggregates

Section: 8.5.1 [dcl.init.aggr] Status: WP Submitter: Ville Voutilainen Opened: 2013-03-15 Last modified: 2014-05-19

View all other issues in [dcl.init.aggr].

View all issues with WP status.

Discussion:

http://open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3605.html

http://open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3653.html

Accepted into the Working Draft in Bristol 2013, as N3653.

### 62. N3648, N3610 Generic lambda-capture initializers, supporting capture-by-move

Section: 5.1.2 [expr.prim.lambda] Status: WP Submitter: Ville Voutilainen Opened: 2013-03-15 Last modified: 2014-05-19

View all other issues in [expr.prim.lambda].

View all issues with WP status.

Discussion:

http://open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3610.html

http://open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3648.html

Accepted into the Working Draft in Bristol 2013, as N3648.

### 64. N3651, N3615 Constexpr Variable Templates, N3552 Introducing Object Aliases

Section: 14.1 [temp.param] Status: WP Submitter: Gabriel Dos Reis Opened: 2013-03-18 Last modified: 2014-05-19

View other active issues in [temp.param].

View all other issues in [temp.param].

View all issues with WP status.

Discussion:

http://open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3552.pdf

http://open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3615.pdf

http://open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3651.pdf

Accepted into the Working Draft in Bristol 2013, as N3651.