Red Hat at the ISO C++ Standards Meeting (June 2016, Oulu): Core Language--Jason Merrill

By Adrien Hamelin | Jul 19, 2016 02:00 PM | Tags: experimental advanced

C++ continues to evolve:

Red Hat at the ISO C++ Standards Meeting (June 2016, Oulu): Core Language

by Jason Merrill

From the article:

It was quite a trek to get to Oulu, Finland for the June 2016 C++ Standards Committee meeting, but we were warmly received and the meeting went well once we arrived. We had very pleasant weather most of the week, and it was fun to experience the midnight sun, even though it played havoc with my sleep schedule.

Red Hat at the ISO C++ Standards Meeting (June 2016, Oulu): Parallelism and Concurrency--Torvald Rie

By Adrien Hamelin | Jul 19, 2016 01:55 PM | Tags: experimental advanced

C++ continues to evolve:

Red Hat at the ISO C++ Standards Meeting (June 2016, Oulu): Parallelism and Concurrency

by Torvald Riegel

From the article:

Several Red Hat engineers recently attended the JTC1/SC22/WG21 C++ Standards Committee meetings in Oulu, Finland.  This post focuses on the sessions of SG1 (the standards committee sub-group 1 – for concurrency and parallelism) as well as on coroutines-related sessions. Jason already gave an overview of the meeting in his post.

Quick Q: How to express constness of a forwarding reference?

By Adrien Hamelin | Jul 18, 2016 01:31 PM | Tags: c++11 basics

Quick A: To express constness, a const reference is what is needed.

Recently on SO:

How to express constness of a forwarding reference?

How can I express that f does not modify its parameter?

If the function doesn't modify its parameter then there is no benefit to using a forwarding reference. You use a forwarding reference when you want to forward the parameter on to some other function which cares whether the argument is an lvalue or an rvalue (because maybe there are separate overloads for lvalues and rvalues, and the rvalue one can be more efficient).

If your function doesn't modify the argument then it shouldn't need to care whether it has an lvalue or rvalue, so it can just take const T& unconditionally. That can bind to both lvalues and rvalues, and promises not to modify the parameter.

template<typename T>
void f(const T& t) { ... }

Quick Q: Is there a range class in C++11 for use with range based for loops?

By Adrien Hamelin | Jul 18, 2016 01:28 PM | Tags: community basics

Quick A: Not in the standard, but in other libraries yes.

Recently on SO:

Is there a range class in C++11 for use with range based for loops?

The C++ standard library does not have one, but Boost.Range has boost::counting_range, which certainly qualifies. You could also use boost::irange, which is a bit more focused in scope.

CppCon 2015 Large Scale C++ with Modules: What You Should Know--Gabriel Dos Reis

By Adrien Hamelin | Jul 18, 2016 01:22 PM | Tags: experimental efficiency

Have you registered for CppCon 2016 in September? Don’t delay – Registration is open now.

While we wait for this year’s event, we’re featuring videos of some of the 100+ talks from CppCon 2015 for you to enjoy. Here is today’s feature:

Large Scale C++ with Modules: What You Should Know

by Gabriel Dos Reis

(watch on YouTube) (watch on Channel 9)

Summary of the talk:

“Modules” are a frequently requested and long-awaited feature by C++ programmers. In a nutshell, the idea is to have a direct language support for (a) expressing the boundaries and dependencies of a program component; (b) isolating source codes from macro vagaries; (c) scaling compile time, especially for large projects, given the ubiquity of “headers-only” template libraries; (d) spur innovation and deployment of semantics-aware developer tools.

This presentation will focus on three major points: (1) the design of the module proposal currently being considered by the C++ standards committee (design goals, properties, constraints); (2) implementations currently under way; and (3) early user experience and migration.

Modules directly address a problem (scalability) listed as one of the three major areas where C++17 is expected to significantly improve daily experience of the working C++ programmer. Naturally, this feature is also on the top ten list of C++17 functionalities Bjarne Stroustrup put forward in his “Thought on C++17.”

C++ Weekly Episode 20: C++17's Fold Expressions - Introduction—Jason Turner

By Jason Turner | Jul 18, 2016 12:29 PM | Tags: None

Episode 20 of C++ Weekly.

C++17's Fold Expressions - Introduction

by Jason Turner

About the show:

This week Jason introduces C++17's fold expressions.

 

HPX version 0.9.99 released -- STE||AR Group

By Hartmut Kaiser | Jul 18, 2016 05:28 AM | Tags: performance parallelsim heterogeneous computing distributed computing c++17 c++14 c++11

The STE||AR Group has released V0.9.99 of HPX -- A general purpose parallel C++ runtime system for applications of any scale.

HPX V0.9.99 Released

The newest version of HPX (V0.9.99) is now available for download! Please see here for the release notes.

HPX exposes an API fully conforming to the concurrency related parts of the C++11/C++14/C++17 standards, extended and applied to distributed and heterogeneous computing, and aligned with the ongoing standardization discussions.

From the announcement:

• Version 1.0 approaches! This release is significant as HPX is nearly feature complete. Over the next several months we will continue to test and polish HPX’s API and documentation. The feedback and experience gained from the community’s utilization of this release will provide guidance on where to add the finishing touches for V1.0.
• We have put a lot of effort into improving the overall performance and stability of the library. Applications written using HPX have shown to outperform equivalent applications which are based on more conventional parallelization methods.
• In this release we finished the implementation of transparent migration of components to another locality (e.g. physical compute-node). It is now possible to trigger a migration operation without ‘stopping the world’ for the object to migrate. HPX will make sure that no work is being executed on the object while it is moved and that all subsequently scheduled work for the migrated object will be transparently forwarded to the new locality. The global address of the migrated object does not change, thus the application will not have to be changed in any way to support this new functionality.

2016-07 Post-Oulu mailing available

By Blog Staff | Jul 15, 2016 01:57 PM | Tags: None

The 2016-07 mailing of new standards papers is now available.

NOTE: A number of these papers have already been publicized on this blog. This is the complete list including ones not previously publicized.

CppCon 2016 Program Preview: Concurrency, Modules and Finance

By Bryce Adelstein Lelbach | Jul 15, 2016 12:38 PM | Tags: None

We have more CppCon 2016 program previews today! A selection of talks on concurrency, modules and finance, including talks by Hans Boehm, Anthony Williams and Richard Smith.

Program Preview: Concurrency, Modules, Finance

From the article:

Speaking for the first time in the US, Anthony Williams, the maintainer of Boost.Thread and the author of C++ Concurrency in Action will be joining us this year at CppCon! His talk, The Continuing Future of Concurrency in C++, will provide overview of the additions to the standard C++ concurrency libraries in the Technical Specifications for Concurrency and Parallelism and the C++14 and C++17 standards. ... [and much more]

CppCast Episode 63: IncludeOS with Alfred Bratterud

By robwirving | Jul 15, 2016 09:05 AM | Tags: None

Episode 63 of CppCast the only podcast for C++ developers by C++ developers. In this episode Rob and Jason are joined by Alfred Bratterud, CEO of IncludeOS to discuss Microservice applications with the IncludeOS platform.

CppCast Episode 63: IncludeOS with Alfred Bratterud

by Rob Irving and Jason Turner

About the interviewee:

Alfred has been doing research towards IncludeOS since 2013, and got a PhD scholarship based on the early work in 2014. The IEEE CloudCom paper introducing the IncludeOS prototype was published in 2015 and he spun out a startup around IncludeOS in 2016, in collaboration with Oslo and Akershus university college (the largest institution for engineering education in Norway). He's currently focusing 100% on developing IncludeOS from research experiment to a production ready platform for cloud services.

Alfred holds BSc and MSc in computer science, with focus on logic and computability, from the university of Oslo. He has 10+ years of industrial programming experience, mostly in web services. He's been working at Oslo university college since 2011, teaching various subjects ranging from operating systems, sysadmin and firewalls to web development. He started learning C++ when he took over a C++ course at the college in 2011. A very good year to start C++.