New paper: N3742, Three <random>-related Proposals, v2 -- Walter Brown

By Blog Staff | Aug 29, 2013 09:05 AM | Tags: None

A new WG21 paper is available. A copy is linked below, and the paper will also appear in the next normal WG21 mailing. If you are not a committee member, please use the comments section below or the std-proposals forum for public discussion.

Document number: N3742

Date: 2013-08-30

Three <random>-related Proposals, v2

by Walter Brown

Excerpt:

This paper proposes (1) to add one function template to <algorithm>, (2) to add a few novice-friendly
functions to <random>, and (3) to deprecate some related <cstdlib> legacy interfaces.
The unifying factor in this tripartite proposal is the entities’ respective connection with the
random number component of the C++11 standard library.

New paper: N3741, Toward Opaque Typedefs for C++1Y, v2 -- Walter Brown

By Blog Staff | Aug 29, 2013 09:02 AM | Tags: None

A new WG21 paper is available. A copy is linked below, and the paper will also appear in the next normal WG21 mailing. If you are not a committee member, please use the comments section below or the std-proposals forum for public discussion.

Document number: N3741

Date: 2013-08-30

Toward Opaque Typedefs for C++1Y, v2

by Walter Brown

Excerpt:

Although this paper is self-contained, it logically follows our discussion, begun several years ago in
N1706 and continued in N1891, of a feature oft-requested for C++: an opaque typedef, sometimes
termed a strong typedef. The earlier of those works was presented to WG21 on 2004-10-20 during
the Redmond meeting, and the later work was presented during the Berlin meeting on 2005-04-06.
Both presentations resulted in very strong encouragement to continue development of such a
language feature. Alas, the press of other obligations has until recently not permitted us to
resume our explorations.

Now with C++11 as a basis, we return to the topic. Where our earlier thinking and nomenclature
seem still valid, we will repeat and amplify our exposition; where we have new insights, we will
follow our revised thinking and present for EWG discussion a high-level proposal for a C++1Y
language feature to be known as an opaque alias. ...

New paper: N3740, A Proposal for the World’s Dumbest Smart Pointer, v2 -- Walter Brown

By Blog Staff | Aug 29, 2013 09:01 AM | Tags: None

A new WG21 paper is available. A copy is linked below, and the paper will also appear in the next normal WG21 mailing. If you are not a committee member, please use the comments section below or the std-proposals forum for public discussion.

Document number: N3740

Date: 2013-08-30

A Proposal for the World’s Dumbest Smart Pointer, v2

by Walter Brown

Excerpt:

We present the following code as a preliminary specification of intent in order to serve as a
basis for technical discussion. Designed as a pointer that takes no formal notice of its pointee’s
lifetime, this not-very-smart pointer template is intended as a replacement for near-trivial uses of
bare/native/raw/built-in/dumb C++ pointers, especially when used to communicate with (say)
legacy code that traffics in such pointers. It is, by design, exempt (hence its working name) from
any role in managing any pointee, and is thus freely copyable independent of and without regard
for its pointee.

We have found that such a template provides us a standard vocabulary to denote non-owning
pointers, with no need for further comment or other documentation to describe the near-vacuous
semantics involved...

New paper: N3711, Task Groups As a Lower Level C++ Library Solution To Fork-... -- Laksberg, Sutter

By Blog Staff | Aug 28, 2013 02:41 PM | Tags: concurrency

N3711.pdfA new WG21 paper is available. A copy is linked below, and the paper will also appear in the next normal WG21 mailing. If you are not a committee member, please use the comments section below or the std-proposals forum for public discussion.

Document number: N3711

Date: 2013-08-15

Task Groups As a Lower Level C++ Library Solution To Fork-Join Parallelism

by Artur Laksberg and Herb Sutter

Excerpt:

The task_group concept proposed in this document is based on the common subset of the PPL and the TBB libraries, which also use task_group internally to implement many of their own parallel algorithms. This proposal complements the high-level Parallel STL algorithms proposal [2] by enabling arbitrary fork-join parallelism, including arbitrary additional higher-level parallelism algorithms, to be built in a natural and portable way.

Together with [2], we believe this offers a viable alternative to a language-based proposal for low-level fork-joined parallelism with competitive (or in some cases better) usability, generality, and performance.

New paper: N3716, A printf-like Interface for the Streams Library (revision 1) -- Zhihao Yuan

By Blog Staff | Aug 28, 2013 02:35 PM | Tags: None

A new WG21 paper is available. A copy is linked below, and the paper will also appear in the next normal WG21 mailing. If you are not a committee member, please use the comments section below or the std-proposals forum for public discussion.

Document number: N3716p>

Date: 2013-08-18

A printf-like Interface for the Streams Library (revision 1)

by Zhihao Yuan

Excerpt:

Changes since N3506

• Support Boost.Format’s simple positional syntax (%1%, %2% ...).
• Cover the cornor cases “not-mentioned” by the C standard.
• Mention the function style syntax suggested by BSI in “Future Issues”.

Overview

cout << putf("hello, %s\n", "world");

Printf defines the most widely used syntax to format a text output. It exists in C, Perl, Python and even Java™, and is available from Qt to Boost.Format[1], but not C++ standard library. This proposal tries to define such an interface based on the printf function defined by C[2] for the C++ I/O streams library, with the error handling policy and the type safety considered.

New paper: N3708, A proposal to add coroutines to the C++ standard library -- O Kowalke, N Goodspeed

By Blog Staff | Aug 28, 2013 02:28 PM | Tags: concurrency

A new WG21 paper is available. A copy is linked below, and the paper will also appear in the next normal WG21 mailing. If you are not a committee member, please use the comments section below or the std-proposals forum for public discussion.

Document number: N3708

Date: 2013-03-04

A proposal to add coroutines to the C++ standard library

by Oliver Kowalke and Nat Goodspeed

Excerpt:

This proposal suggests adding two first-class continuations to the C++ standard library:
std::coroutine<T>::pull_type and std::coroutine<T>::push_type.

New paper: N3733, ISO/IEC CD 14882, C++ 2014, National Body Comments -- Barry Hedquist

By Blog Staff | Aug 28, 2013 12:37 PM | Tags: None

A new WG21 paper is available. A copy is linked below, and the paper will also appear in the next normal WG21 mailing. If you are not a committee member, please use the comments section below or the std-proposals forum for public discussion.

Document number: N3733

Date: 2013-08-26

ISO/IEC CD 14882, C++ 2014, National Body Comments

by Barry Hedquist, INCITS/PL22.16 IR

Excerpt:

Attached is a complete set of National Body Comments submitted to JTC1 SC22 in response to the SC22 Ballot for ISO/IEC CD 14882, Committee Draft of the revision of ISO/IEC 14882:2011, aka C++ 2014.

This document is a revision to SC22 N4836, CD14882 Collated Comments. The revision contains a consistent numbering scheme for all comments. Comments that contained no numbering were numbered sequentially in the exact order presented in SC22 N4836. Comments that were numbered in the "Line Number" column (column 2) were moved to the MB/NC column (column 1). No other editing was done on any of the comments.

Document numbers referenced in the ballot comments are WG21 documents unless otherwise stated.

Resumable Functions: async and await -- Jens Weller

By Meeting C++ | Aug 18, 2013 10:21 AM | Tags: standardization performance experimental concurrency

A look at resumable functions:

Resumable Functions: async and await

by Jens Weller

From the article:

While I did my series about the papers for Bristol, there was one paper, which I personally found a bit weird. This paper was about resumable functions, and at that time it was just another paper full of ideas for C++ to me. At C++Now suddenly, I got a better insight to what the use of resumable functions could be...

Libc++ C++1Y/C++14 status page is now available

By marshall | Aug 13, 2013 11:31 AM | Tags: None

Libc++ now has a status page for the C++1Y/C++14 implementation. You can follow along here to see when your favorite features are implemented:

libc++ C++1Y status

New paper: N3707, 2014-02 Meeting Invitation and Information -- Herb Sutter

By Blog Staff | Aug 6, 2013 08:56 AM | Tags: None

A new WG21 paper is available. A copy is linked below, and the paper will also appear in the next normal WG21 mailing. If you are not a committee member, please use the comments section below or the std-proposals forum for public discussion.

Document number: N3707

Date: 2013-08-06

2014-02 Meeting Invitation and Information

by Herb Sutter

Excerpt:

The winter 2014 meeting of WG21 is being hosted by Microsoft and will be held on February 10-15, 2014 at Hilton Garden Inn, 1800 NW Gilman Blvd., Issaquah, Washington, USA 98027