Doc. no. | N4422 |
Date: | 2015-04-10 |
Project: | Programming Language C++ |
Reply to: | Ville Voutilainen <ville.voutilainen@gmail.com> |
Revised 2015-04-10 at 16:04:35 UTC
Reference ISO/IEC IS 14882:2003(E)
Also see:
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.
Section: 7.1.6.4 [dcl.spec.auto] Status: C++14 Submitter: Jason Merrill Opened: 2012-03-27 Last modified: 2015-04-02
View all other issues in [dcl.spec.auto].
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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.
Section: 7.6 [dcl.attr] Status: C++14 Submitter: Alberto Ganesh Barbati Opened: 2012-06-12 Last modified: 2015-04-02
View all issues with C++14 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.
Section: 12.8 [class.copy] Status: C++14 Submitter: Ville Voutilainen Opened: 2012-09-21 Last modified: 2015-04-02
View all other issues in [class.copy].
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Discussion:
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3401.htmlReviewed 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.
Section: 2.14.2 [lex.icon] Status: C++14 Submitter: Peter Sommerlad Opened: 2012-09-08 Last modified: 2015-04-02
View all issues with C++14 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.
Section: 18 [language.support] Status: Resolved Submitter: Mike Spertus Opened: 2012-09-22 Last modified: 2015-04-02
View all issues with Resolved status.
Discussion:
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3403.pdf
http://open-std.org/JTC1/SC22/WG21/docs/papers/2012/n3492.pdf
Not reviewed by EWG yet, to be handled by the Reflection Study Group (SG7).
Section: 5.1.2 [expr.prim.lambda] Status: C++14 Submitter: Faisal Vali Opened: 2012-09-21 Last modified: 2015-04-02
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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.
Section: 5.1.2 [expr.prim.lambda] Status: C++14 Submitter: Herb Sutter Opened: 2012-09-23 Last modified: 2015-04-02
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Discussion:
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3424.pdfReviewed 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.
Section: 3.7.4 [basic.stc.dynamic] Status: C++14 Submitter: Lawrence Crowl Opened: 2012-09-23 Last modified: 2015-04-02
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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.
Section: 3.7.4 [basic.stc.dynamic] Status: C++14 Submitter: Lawrence Crowl Opened: 2012-09-23 Last modified: 2015-04-02
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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.
Section: 5.19 [expr.const] Status: C++14 Submitter: Richard Smith Opened: 2012-09-21 Last modified: 2015-04-02
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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.
Section: 2.10 [lex.ppnumber] Status: C++14 Submitter: Daveed Vandevoorde Opened: 2012-09-21 Last modified: 2015-04-02
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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.
Section: 23.3.6 [vector] Status: Resolved Submitter: Nevin Liber Opened: 2012-11-27 Last modified: 2015-04-02
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Discussion:
I'd like it to be possible to use the small object optimization (embedding up to a fixed number of objects inside the allocator itself) inside a vector.
Bristol 2013: Designated for LEWG.
Filed as LEWG Bug 38, closing as Resolved on the EWG side.
Section: 21.4.2 [string.cons] Status: Resolved Submitter: Nevin Liber Opened: 2012-12-19 Last modified: 2015-04-02
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Discussion:
In n3485 21.4.2p6 (basic_string constructors and assignment operators), we have:
basic_string(const charT* s, size_type n, const Allocator& a = Allocator()); Requires: s shall not be a null pointer and n < npos.That requires clause is too restrictive; s can be a null pointer when n==0. A (simplified) use case I have seen:
std::string StringFromVector(std::vector<char> const& vc) { return std::string(vc.data(), vc.size()); }Since a conforming implementation can return a null pointer for vc.data() when vc.size() == 0. I don't see any reason to disallow this construct, especially since it takes a Standards expert to see that this is possibly illegal, but not std::string(vc.data(), vc.data() + vc.size()). This is likely to go onto the LEWG's plate.
Bristol 2013: Defer to LEWG.
Filed as LEWG Bug 39, closing as Resolved on the EWG side.
Wording available:
Requires: n < npos and either s shall not be a null pointer or n == 0.
Section: 20.8.9 [bind] Status: Resolved Submitter: Chris Jefferson Opened: 2013-01-25 Last modified: 2015-04-02
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Discussion:
As more variadic functions work their way into my C++ code, I'm getting increasingly annoyed that there isn't a variadic bind. There is a tiny bit of annoyance on exactly what to use. There seems to me to be 2 sensible choices (other people may have others)
1) _args : Use all otherwise unnamed arguments. 2) _3onwards : All arguments from the 3rd onwards.I haven't personally found a need for multiple ranges of variadic arguments, or more complicated chopping (such as getting the last few arguments), and I'd want to hopefully keep this simple if possible!
Bristol 2013: Defer to LEWG.
Filed as LEWG Bug 40, closing as Resolved on the EWG side.
Section: 20.9.4.3 [meta.unary.prop] Status: Resolved Submitter: Nevin Liber Opened: 2013-02-05 Last modified: 2015-04-02
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Discussion:
I'd like to have an is_range<T, R = void> type trait, which derives from true_type if and only if T can be used in range-based for, and *__begin is convertible to R (where R == void means don't bother checking this condition).
Bristol 2013: Submitter is encouraged to proceed and present to LWG. Apparently LEWG doesn't handle these.
Filed as LEWG Bug 41, closing as Resolved on the EWG side.
Section: 20.9.4.3 [meta.unary.prop] Status: C++14 Submitter: Nevin Liber Opened: 2013-02-05 Last modified: 2015-04-02
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Discussion:
I'd like to have an is_final<T> type trait, which is true if and only if T is a final type.
Bristol 2013: Submitter is encouraged to proceed and present to LWG. Apparently LEWG doesn't handle these.
Voted into C++14 in Issaquah 2014 as the resolution of LWG issue 2112.
Section: 8.5.1 [dcl.init.aggr] Status: C++14 Submitter: Ville Voutilainen Opened: 2013-03-15 Last modified: 2015-04-02
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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.
Section: 5.1.2 [expr.prim.lambda] Status: C++14 Submitter: Ville Voutilainen Opened: 2013-03-15 Last modified: 2015-04-02
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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.
Section: 15.5 [except.special] Status: WP Submitter: Herb Sutter Opened: 2013-03-11 Last modified: 2015-04-02
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Discussion:
http://open-std.org/JTC1/SC22/WG21/docs/papers/2014/n4152.pdf
http://open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3614.pdf
Bristol 2013: Voutilainen pointed out that there are previous proposals on similar facilities (http://open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2952.html), and that there's existing practice that is different from this proposal (existing practice returns an int, not a bool). Stroustrup thought that he would need convincing examples about the int, and thought that the facility in general needs better motivation. Voutilainen said that it would be best to create a revisions/synthesis paper that covers the existing practice and the previous proposals and improves the motivational examples.
Author is encouraged to revise.
In Chicago 2013, Voutilainen said he plans to work on this issue and create a follow-up paper for C++17.
Adopted into the working draft in Urbana, as N4259.
Section: 14.1 [temp.param] Status: C++14 Submitter: Gabriel Dos Reis Opened: 2013-03-18 Last modified: 2015-04-02
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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.
Section: 20.4.1 [tuple.general] Status: Resolved Submitter: Nevin Liber Opened: 2013-03-19 Last modified: 2015-04-02
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Discussion:
In 20.4.1p2, the unspecialized std::tuple_size is undefined. It would be a lot more useful if it were defined as an empty struct; that way, it can be used with enable_if for determining whether or not it is valid to use tuple_size, tuple_element and get on the corresponding data structure.
This should go to LEWG.
Filed as LEWG Bug 42, closing as Resolved on the EWG side.
Section: 7 [dcl.dcl] Status: WP Submitter: Walter E. Brown Opened: 2014-01-01 Last modified: 2015-04-02
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Discussion:
http://open-std.org/JTC1/SC22/WG21/docs/papers/2014/n3846.pdf
Issaquah 2014: EWG discussed the paper, and found preference towards option 3, which allows implementations to use useful messages, but doesn't force them to document what they provide, so it was seen superior to the other alternatives. The proposal is expected to go forward to Core, and it has wording already.
Adopted into the working draft in Urbana,as N3928.
Wording available:
The paper contains the proposed wording.Section: 1.10 [intro.multithread] Status: WP Submitter: M. Wong, V. Luchangco, J. Maurer, M. Moir, et al. Opened: 2014-01-20 Last modified: 2015-04-02
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Discussion:
http://open-std.org/JTC1/SC22/WG21/docs/papers/2014/n4180.pdf
http://open-std.org/JTC1/SC22/WG21/docs/papers/2014/n3919.pdf
http://open-std.org/JTC1/SC22/WG21/docs/papers/2014/n3859.pdf
http://open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3718.pdf
Issaquah 2014: EWG discussed the paper, and found consensus to move the proposal forward to a Technical Specification.
Accepted for creation of a Technical Specification in Urbana, as N4272 and N4265.
Section: 7.3.1 [namespace.def] Status: WP Submitter: Richard Smith Opened: 2013-08-26 Last modified: 2015-04-02
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Discussion:
http://open-std.org/JTC1/SC22/WG21/docs/papers/2014/n4196.html
See Core issue 1657.
Issaquah 2014: EWG wants to point out that it's important to remember to consider inline namespaces and anonymous namespaces, and that the rationale for both namespaces and enumerators is [[deprecated]].
Discussed in Rapperswil 2014. Smith is encouraged to write a proposal for EWG review, EWG expects to send it towards CWG without much ado.
Adopted into the working draft in Urbana, as N4266.
Section: 2.14.3 [lex.ccon] Status: WP Submitter: Richard Smith Opened: 2014-04-14 Last modified: 2015-04-02
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Discussion:
http://open-std.org/JTC1/SC22/WG21/docs/papers/2014/n4197.html
The discussion thread started at [c++std-ext-14798].
We have five encoding-prefixes for string-literals (none, L, u8, u, U) but only four for character literals -- the missing one is u8 for character literals.
This matters for implementations where the narrow execution character set is not ASCII. In such a case, u8 character literals would provide an ideal way to write character literals with guaranteed ASCII encoding (the single-code-unit u8 encodings are exactly ASCII), but... we don't provide them. Instead, the best one can do is something like this:
char x_ascii = { u'x' };... where we'll get a narrowing error if the codepoint doesn't fit in a 'char'. (Note that this is not quite the same as u8'x', which would give us an error if the codepoint was not representable as a single code unit in UTF-8.)
Is there a good reason for omitting this (useful and natural) functionality?
Discussed in Rapperswil 2014. EWG considers this to be an improvement, and encourages the author to take a proposal with wording to CWG. It's expected that Smith can do so without a separate EWG review.
Voted into the working draft in Urbana, as N4267.
Section: 2.2 [lex.phases] Status: WP Submitter: Richard Smith Opened: 2014-05-06 Last modified: 2015-04-02
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Discussion:
http://open-std.org/JTC1/SC22/WG21/docs/papers/2014/n4086.html
http://open-std.org/JTC1/SC22/WG21/docs/papers/2014/n4210.pdf
http://open-std.org/JTC1/SC22/WG21/docs/papers/2014/n3981.html
Wording available:
The paper contains the proposed wording.
Discussed in Rapperswil 2014. IBM continues to oppose.
Straw poll:
SF 9, WF 6, N 6, WA 3, SA 2.
Another poll, no neutral option:
SF 10, WF 9, WA 3, SA 3.
Deprecate/Remove/Status Quo, three-way poll:
5/16/6. Removal is still by far the strongest.
The proposal goes forward to CWG. CWG has already reviewed it and designated it ready for voting in Urbana.
Adopted into the working draft in Urbana, as N4086.
Section: 5 [expr] Status: Resolved Submitter: D. Gutson, A. Bustamante Opened: 2014-05-08 Last modified: 2015-04-02
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Discussion:
http://open-std.org/JTC1/SC22/WG21/docs/papers/2014/n3990.pdf
Wording available:
The paper contains the proposed wording.
Discussed in Rapperswil 2014.
EWG was unanimously against having an operator for this, and recommended taking the idea up with the Numerics SG and then with LWG. Closing as resolved, Vandevoorde sent a heads-up to the Numerics reflector.
Section: 3.3.6 [basic.scope.namespace] Status: WP Submitter: Robert Kawulak Opened: 2014-05-23 Last modified: 2015-04-02
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Discussion:
http://open-std.org/JTC1/SC22/WG21/docs/papers/2014/n4230.html
http://open-std.org/JTC1/SC22/WG21/docs/papers/2014/n4116.pdf
http://open-std.org/JTC1/SC22/WG21/docs/papers/2014/n4026.html
Discussed in Rapperswil 2014.
Straw poll, the full facility (JUST the basic syntactic sugar, no attributes, no aliases, no inline):
SF: 11 F: 5 N: 3 A: 0 SA: 0
The guidance is to provide only the basic syntactic sugar, no attributes, no aliases. Initial wording is necessary before this can proceed to Core. It is expected that EWG will review a revised paper before CWG will review the wording.
Adopted into the working draft in Urbana, as N4266.
Section: 14.1 [temp.param] Status: WP Submitter: Richard Smith Opened: 2014-05-26 Last modified: 2015-04-02
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Discussion:
http://open-std.org/JTC1/SC22/WG21/docs/papers/2014/n4051.html
Discussed in Rapperswil 2014, approved by acclamation, ready to go to CWG. CWG already reviewed it and designated it ready for voting in Urbana.
Adopted into the working draft in Urbana, as N4051.
Section: 1 [intro] Status: Resolved Submitter: Ville Voutilainen Opened: 2014-07-01 Last modified: 2015-04-10
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Discussion:
13 extern "C" for Parameters of Function Templates -> request Core to close as NAD, Daveed says aliases with linkage are the solution. 1463 will be opened as an EWG issue to solve this.
203 Type of address-of-member expression -> new EWG issue, 89. The EWG issue is NAD, too late for a breaking change, instruct CWG to also close as NAD.
230 Calls to pure virtual functions -> Instruct Core to close 230 as NAD. Pure virtual functions can be called by non-virtual calls only, and it is by design that virtual calls should never resolve to the definition of a pure virtual function. The behaviour is undefined because implementations aren't required to prevent ending up in the pure virtual function definition. That is also by design.
622 Relational comparisons of arbitrary pointers -> new EWG issue, 91. The issue is NAD -> instruct CWG to do the same.
623 Use of pointers to deallocated storage -> Instruct Core to close 623 as WP. The behavior is implementation-defined rather than undefined in the current working draft, and thus the requirements are no longer draconian. 312, which was resolved as DRWP points to 623, so also close 623 as DRWP.
755 Generalized lambda-captures -> Instruct Core to close 755 as WP. Generalized lambda-captures are in C++14.
822 Additional contexts for template aliases -> new EWG issue, 95. -> issue is NAD, suggest CWG also closes as NAD.
947 Deducing type template arguments from default function arguments -> Open an EWG issue, 97, for 947, immediately close as NAD, explaining that the group doesn't think it's generally implementable. Leave the door open (but not the issue :)) for a restricted implementation.
1259 Deleting a POD via a pointer to base -> new EWG issue, 99. -> issue is NAD, suggest CWG closes as NAD.
1272 Implicit definition of static data member of const literal type -> new EWG issue, 100. -> issue is NAD, suggest CWG closes as NAD.
1461 Narrowing conversions to bit-fields -> Instruct Core to close 1461 as NAD. It would break existing code and EWG doesn't consider the breakage to be worth it. Vandevoorde pointed out valid existing code that initializes bitfields (even with one bit) with -1.
1474 User-defined literals and <inttypes.h> format macros -> Instruct Core to close 1474 as NAD. The fix would be to remove UDLs.
1519 Conflicting default and variadic constructors -> Open an EWG issue for 1519, 107. Mark as NAD, there is a work-around and Concepts Lite will make the work-around much easier.
1564 Template argument deduction from an initializer list -> new EWG issue, 109. -> issue is NAD, suggest CWG closes as NAD as well.
1586 Naming a destructor via decltype -> new EWG issue, 112. -> issue is NAD, suggest CWG closes as NAD as well.
1657 Attributes for namespaces and enumerators -> Open an EWG issue for 1657, 113. Remember to consider inline namespaces and anon namespaces. Rationale for both namespaces and enumerators is [[deprecated]].
1754 Declaration of partial specialization of static data member template -> new EWG issue, 132 (NAD, lack of motivation for the change)
1798 exception-specifications of template arguments -> new EWG issue, 133 (NAD, insufficient motivation for a change, no desire to have exception specifications in the type system, paper requested if there's desire to reopen)
1833 friend declarations naming implicitly-declared member functions
Straw poll, Rapperswil 2014, NAD?
SF 3 - WF 7 - N 7 - WA 2 - SA 0
-> instruct CWG to close as NAD, EWG didn't find sufficient motivation for the extension suggested.
Section: 8.3.2 [dcl.ref] Status: WP Submitter: H. Sutter, B. Stroustrup, G. Dos Reis Opened: 2014-10-06 Last modified: 2015-04-02
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Discussion:
http://open-std.org/JTC1/SC22/WG21/docs/papers/2014/n4164.pdf
Adopted into the working draft in Urbana, as N4262.
Section: 5.1 [expr.prim] Status: WP Submitter: A. Sutton, R. Smith Opened: 2014-10-07 Last modified: 2015-04-02
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Discussion:
http://open-std.org/JTC1/SC22/WG21/docs/papers/2014/n4191.html
Adopted into the working draft in Urbana, as N4295.
Section: 5.19 [expr.const] Status: WP Submitter: Richard Smith Opened: 2014-10-06 Last modified: 2015-04-02
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Discussion:
http://open-std.org/JTC1/SC22/WG21/docs/papers/2014/n4198.html
Adopted into the working draft in Urbana, as N4268.
Section: 3.8 [basic.life] Status: WP Submitter: Ville Voutilainen, James Dennett Opened: 2013-05-02 Last modified: 2015-04-02
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Discussion:
http://open-std.org/JTC1/SC22/WG21/docs/papers/2014/n3922.html
http://open-std.org/JTC1/SC22/WG21/docs/papers/2014/n3912.html
http://open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3681.html
Adopted into the working draft in Urbana, as N3922.