The Drawbacks of Implementing Move Assignment in Terms of Swap -- Scott Meyers

By Blog Staff | Jun 24, 2014 12:02 PM | Tags: performance intermediate efficiency

Hot off the Meyers press: How would you implement move, and why? Scott Meyers explains two related issues:

The Drawbacks of Implementing Move Assignment in Terms of Swap

by Scott Meyers

From the article:

More and more, I bump into people who, by default, want to implement move assignment in terms of swap. This disturbs me, because (1) it's often a pessimization in a context where optimization is important, and (2) it has some unpleasant behavioral implications as regards resource management.

Effective Modern C++ due October, preview in early July -- Scott Meyers

By Blog Staff | Jun 24, 2014 07:44 AM | Tags: intermediate

Scott Meyers' highly anticipated new book Effective Modern C++ is on the way:

Effective Modern C++ Status Report

by Scott Meyers

From the announcement:

In recent days, two major milestones for Effective Modern C++ have been achieved. First, I sent a draft of the book's Introduction out for technical review. That was the last part of the book to be written, so I finally have a full draft manuscript. Second, I received an image of the book cover from my publisher, so I now know what the book will look like.

...

• Early October: Digital versions of the book become available.
• Late October: Print versions of the book become available.

If you're dying to see what's in the book, and you don't mind dealing with a manuscript that's in draft form (and hence contains technical errors, awkward prose, Item titles in need of revision, primitive diagrams, confusing explanations, and, I hope, some stuff in decent shape), Effective Modern C++ will be part of O'Reilly's Early Release Program, meaning you'll have a chance to see the book in the same form as my technical reviewers. You'll also be able to offer comments on it. As things stand now, the book is slated to be available in Early Release form the week of July 7th.

Why C++ Sails When the Vasa Sank -- Scott Meyers

By Blog Staff | Jun 23, 2014 10:24 AM | Tags: intermediate basics

Now available online, a nice talk by Scott Meyers about why modern C++ is alive and continues to enjoy life and growth:

Why C++ Sails When the Vasa Sank

by Scott Meyers

The Vasa was a 17th-century Swedish warship which suffered such feature creep during construction that it sank shortly after leaving the harbour on its maiden voyage. In the early 1990s, the C++ standardisation committee adopted the Vasa as a cautionary tale, discouraging prospective language extensions with "Remember the Vasa!" Yet C++ continued to grow, and by the time C++ was standardised, its complexity made the Vasa look like a rowboat.

The Vasa sank, however, while C++ cruised, and it looks likely to continue doing so even as the latest revised standards (C++11 and C++14) add dozens of new features, each with its own idiosyncrasies. Clearly, C++ has gotten some important things right. In this talk, Scott Meyers considers the lessons to be learned from the ongoing success of a complex programming language that's over 30 years old, yet very much alive and kicking.

Masking a Class in Boost Graph, Part 3: Finding the Path -- Vadim Androsov

By Blog Staff | Jun 16, 2014 07:19 AM | Tags: intermediate

Part 3 of Vadim's experience report about using Boost's graph support in an existing game app:

Masking a Class in Boost Graph. Part 3: Finding the Path

by Vadim Androsov

From the article:

In the previous articles of the series we’ve reviewed the adaptive process of the square game field for concepts of boost graphs. Now we’ll consider the process of finding the path in the square field. Implementation of boost search allows adapting the algorithm quite accurately. In this article we’ll provide just one example of such parameterization – an ability to create various lengths of graph edges. ...

Lightweight HTTP Server in less than 40 Lines on libevent and C++11 -- NYM

By Blog Staff | Jun 3, 2014 11:18 AM | Tags: intermediate concurrency

Fresh on Kukuruku:

Lightweight HTTP Server in less than 40 Lines on libevent and C++11

by NYM

From the article:

Looking through programming articles sometimes I see posts about creating your own HTTP server. I am most interested in C++ so I often read blogs about it. After looking them through you could easily write you own web server “on sockets” using boost.asio or something else. I also examined libevent and libev. Each of them has its advantages. Libevent is of great interest to me for developing a small HTTP server. Considering some innovations in C++11 the code becomes much more space-efficient and allows for the creation of a basic HTTP server in less than 40 lines.

Ref-qualifiers -- Andrzej Krzemieński

By Blog Staff | Jun 3, 2014 06:40 AM | Tags: intermediate

The latest from the desk of Andrzej:

Ref-qualifiers

by Andrzej Krzemieński

From the article:

In this post I want to describe a small language feature added in C++11 that, although essential for full value semantics support, is often neglected in tutorials and in compiler implementations....

Writing min function, part 1: The rise of Concepts -- Fernando Pelliccioni

By Fernando Pelliccioni | May 28, 2014 07:32 PM | Tags: intermediate

[Ed: Note that this article series is not (yet) about C++ code, but it promises to go there and it has an interesting pedigree in its generic programming design analysis (Alex Stepanov) and reviewers (several ISO C++ participants including Andrzej Krzemienski and Dean Michael Berris.]

Writing min function, part 1: The rise of Concepts

by Fernando Pelliccioni

From the article:

This is the first in a series of articles in which I want to transmit what I learned (or what I think I learned) from the books, papers, lectures of Alexander Stepanov.

These are the lessons that Alex gives us, and I want to show them in this series:

• Specify our algorithms correctly
• Programming must be based on a solid mathematical foundation
• Designing our API’s consistently
• Not always the library implementations provided by the programming languages we use are correct, even though they are designed by “experts”.
• The concept of Stability
• Generic programming, of course!

Ref-qualified member functions -- Alexander Kulikov

By Blog Staff | May 28, 2014 07:23 PM | Tags: intermediate basics

Today on Kukuruku:

Ref-qualified member functions

by Alexander Kulikov

From the article:

Today I’m going to tell you about a new and a little known (to my mind) C++ feature — reference-qualified member functions. I’ll tell about the rules of such functions overloading and, as an example of use, I’ll show you that with the help of ref-qualified you can try to improve the resource management scheme, which is implemented with the help of another C++ idiom — RAII.

Vector of Objects vs Vector of Pointers Updated -- Bartlomiej Filipek

By Blog Staff | May 22, 2014 07:30 AM | Tags: performance memory intermediate efficiency

More in the "contiguous enables fast" department:

Vector of Objects vs Vector of Pointers Updated

by Bartlomiej Filipek

From the article:

For 1000 particles we need on the average 2000 cache line reads! This is 78% more cache line reads than the first case! Additionally Hardware Prefetcher cannot figure out the pattern -- it is random -- so there will be a lot of cache misses and stalls.

In our experiment the pointer code for 80k of particles was more 266% slower than the continuous case.

ACCU 2014 talk slides now available

By Blog Staff | May 21, 2014 02:58 PM | Tags: intermediate

[Ed: Here's a candidate for the most hilarious thing you'll probably see today: Kevlin Henney's slide deck, including a link to this @netbat tweet.]

The recent ACCU 2014 was another resounding success, and many of the talk slides have now been posted. You can find them here:

Slides, Photos, Blogs via #accu2014 (accu.org)

Some fun C++ highlights with slides available include:

• Dietmar Kuhl · Performance Choices
• Howard Hinnant · Everything You Ever Wanted To Know About Move Semantics (and then some)
• Hubert Matthews · Where is C++ headed?
• Jonathan Wakely · There Ain't No Such Thing As A Universal Reference
• Jonathan Wakely · The C++14 Standard Library
• Kevlin Henney · Immutabilty FTW!
• Marshall Clow · C++ Undefined Behavior -- what is it, and why should I care?
• Olve Maudal · C++ Pub Quiz
• Pattabi Raman · Random number generation in C++ -- present and potential future
• Peter Sommerlad · C++14 an overview on the new standard for C++(11) programmers
• Steve Love · Range and Elevation -- C++ in a modern world
• ... and more (see the page).