News

Introduction To the C++11 Feature: Delegating Constructors -- sumi_cj

Head on over to the C/C++ Cafe for:

Introduction to the C++11 feature: delegating constructors

by sumi_cj

Excerpt:

In C++98, if a class has multiple constructors, these constructors usually perform identical initialization steps before executing individual operations. In the worst scenario, the identical initialization steps are copied and pasted in every constructor. See the following example: ...

Trip Report: ACCU 2013 and the C++ Standards Meeting -- Anthony Williams

Anthony Williams just posted another nice trip report on the recent standards meeting in Bristol, as well as a few words on the ACCU conference held back-to-back with the ISO meeting:

ACCU 2013 and the C++ Standards Meeting

by Anthony Williams

 

This year's ACCU conference was at a new venue: the Marriott hotel in Bristol. This is a bit closer to home for me than the previous venue in Oxford, which made the trip there and back more comfortable. As ever, the conference itself was enjoyable, educational and exhausting in equal measure.

 

This year was also BSI's turn to host the Spring ISO C++ committee meeting, which was conveniently arranged to be the week following ACCU, in the same hotel. Having not attended a meeting since the last time the committee met in the UK, I was glad to be able to attend this too. ...

Introduction To the C++11 Feature: Extended friend Declaration -- FangLu

Head on over to the C/C++ Cafe for:

Introduction to the C++11 feature: extended friend declaration

by FangLu

Excerpt:

The extended friend declaration feature is newly introduced in the C++11 standard. In this article, I will introduce this feature and provide some examples on how to use this feature.

 

Firstly, let's see why this feature is added into C++11. ...

 

GotW #1: Variable Initialization—or Is It? -- Herb Sutter

Herb Sutter is resuming his Guru of the Week series of problem-and-solution articles about coding in C++, with the intent to gradually update the 88 existing issues and write a few more along the way.

The first problem was posted today:

GotW #1: Variable Initialization -- or Is It? (3/10)

by Herb Sutter

This first problem highlights the importance of understanding what you write. Here we have a few simple lines of code — most of which mean something different from all the others, even though the syntax varies only slightly.

The solution is coming "soon"...

Clang/LLVM Conference videos and slides are now available

The recent 2013 European Clang/LLVM developer meeting talk videos and/or slides are now available here.

Here are a few of the talks of interest to C++ developers. All have videos available except the last. Check out the page for details and a full talk list.

Keynotes

Optimization in LLVM - Numbers, A Case Study, and Looking Forward
Chandler Carruth (Google)

Talks

clang-format - Automatic formatting for C++
Daniel Jasper (Google)

Performing Source-to-Source Transformations with Clang
Olaf Krzikalla (TU Dresden)

Run-time tracking of uninitialized data with MemorySanitizer
Evgeniy Stepanov (Google)

LLVM on IBM POWER processors: a progress report
Ulrich Weigand (IBM)

Tutorials

How to implement an LLVM Assembler
Simon Cook (Embecosm)

The Clang AST (slides only)
Manuel Klimek (Google)

For more talks, and video/slide links, head over to the site.

Quick Q: static constexpr variable vs. constexpr function? -- StackOverflow

With a nice Quick A by Morwenn that not only gives the right answer as of today, but is current with a feature voted into C++14 just two weeks ago that lets you drop the ()'s:

static constexpr variable vs. function

Is there a difference between declaring floating point constant as a static constexpr variable and a function as in example below, or is it just a matter of style?

class MY_PI
{
public:
    static constexpr float MY_PI_VAR = 3.14f;
    static constexpr float MY_PI_FUN() { return 3.14f; }
}

Functional Patterns in C++ -- Bartosz Milewski

bartosz-milewski-functional.pngIf you're familiar with functional language styles and you want an advanced look at how your favorite functional styles are supported in modern C++, with a dash of Haskell, check out these three videos by Bartosz Milewski:

Functional Patterns in C++ (slides)

by Bartosz Milewski

Part 1, Functors: First the introduction to some common functional patterns like Functor, which, surprisingly pops up everywhere. I'll show the example of a unique_ptr and a vector as Functors. Of course, this is only in preparation for asynchronous functors.

Part 2, Currying, Applicative: A little digression to Haskell and the Maybe functor and the explanation of currying. Then I'll show you the Applicative Functor pattern. This is, of course, in preparation for for the asynchronous applicative functor pattern.

Part 3, Asynchronous API, Monoid, Monad: The encapsulation of asynchronous API that doesn't lead to inversion of control and spaghetti code. Very natural example of a Monad Pattern.

Slides (parts 1-3)

Interestingly, Bartosz' talk ends with a plea for (essentially) future.then and a C#-style await... both of which are under active consideration in the C++ standards committee as part of a potential near-term C++ technical specification on concurrency and parallelism.

Advanced Developer Conference C++

adc.PNGThere's still time to go to:

Advanced Developers C++ 2013

May 7-8, 2013

Bad Aibling, Germany

Sessions are presented in either English or German. While the conference has many Windows-focused topics, a number of the sessions are of general interest to C++ developers.

Here are highlights from the Sessions page:

Trends and Future of C++ Standard and ISOCPP.org
Transactional Memory in C++
Michael Wong, IBM, and subgroup chair of ISO C++ SG5 (Transactional Memory)

Keynote: Building Modern Device Apps with C++ 
Building and Consuming Cloud Services with C++
Steve Teixeira, Microsoft

Warum wird Code so wie er ist? [Why does code get the way it does?]
Holger Kolb, DEVCOL

Einfacheres C++ mit C++11 [Simpler C++ with C++11]
Peter Sommerlad, FHO HSR Hochschule für Technik

Sicher sein oder sicher fühlen? -- Sicheren C++ Code schreiben [Be secure or feel secure? -- Writing secure C++ code]
Oliver Niehus, Microsoft

Performance-Optimierung für parallelen C++ Code auf Windows [Performance optimizing parallel C++ code on Windows]
Programmieren und Optimieren auf Xeon Phi [Programming and Optimizing for Xeon Phi]
Michael Steyer, Intel

Continue reading more sessions...

Trip Report: ISO C++ Spring 2013 Meeting, Part 3 -- Michael Wong

iconNoCommunityPhoto155.pngPart 3 of Michael Wong's trip report:

The view from C++ Standard meeting April 2013 Part 3

by Michael Wong

In this series that looks at C++14 content, we looked at features from Language and Library for C++14. Now we will look at Concurrency which is the other group that contributed features for C++14. In reality, some of the features from Language and Library also came from Concurrency. ...

C++ on the Web: Run Your Big 3D Game in the Browser! -- Andre Weissflog

cpp-web.PNGBuilding C++ to target Javascript (e.g., asm.js) and execute C++ in the browser is becoming quite the popular indoor sport. Here's a current presentation and experience report:

C++ on the Web: Run your big 3D Game in the browser! (slides)

by Andre Weissflog
Head of Development, Berlin
Bigpoint GmbH

My presentation about porting large C/C++ code bases to the browser (emscripten, flascc, Google Native Client)

From the Wrap-up slide:

  • You can run big C/C++ code bases ("a million lines of code") in the browser.
  • Javascript is already fast enough for many types of games.
  • Massive performance improvements happening right now (better code generation, JS engines better at running generated code, asm.js...)
  • ...