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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....
By Blog Staff | Jun 3, 2014 05:39 AM | Tags: None
Overload 121 is now available. It contains the following C++-related articles, and more:
CONSTANTS often shout. Jonathan Wakely considers why this happens in C and what the alternatives are in C++.
Using multiple interfaces can slow things down. Daniel Gutson and Pablo Oliva present an alternative.
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!
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.
By Blog Staff | May 27, 2014 08:37 AM | Tags: None
Did you know that C++ is a hot language for mobile development? This seems to be widely known among C++ developers, but surprisingly widely unknown in the non-C++ programming community at large. Two of the major reasons why C++ is currently experiencing this surge in mobile interest are:
In that vein, here's a post from just before the U.S. long weekend about using C++ for cross-platform mobile development.
Expect to see more news like this. Also, expect to see talks on using C++ for modern cross-platform mobile development as one of the hot topics at CppCon this September.
How Dropbox Uses C++ for Cross-Platform iOS and Android Development
by Ole Begemann
From the article:
When work started on the Mailbox app for Android, the team made the choice to write a large portion of the non-UI code in C++ — rather than rewriting the entire app in Java — with the goal of sharing that common C++ layer between iOS and Android. The iOS app used Core Data at the time, so migrating it off of Core Data to the shared C++ library was also part of the process. C++ seemed like an obvious choice because it is available on every platform and team members preferred the language over Java.
The Carousel team made the same choice since launching simultaneously on iOS and Android was an important goal from the start.
By Blog Staff | May 22, 2014 12:01 PM | Tags: basics
Quick A: Because you can only capture local (stack) objects, including function parameters, and to access a data member in a member function you capture the local variable this.
Today on SO:
Why can't a data member be in a lamba capture list
I have a class
foothat hasbaras a member variable.In another member function of the class, I'm writing a lambda function:
[bar](void){}But I can't include
barin the capture list. Why is that?
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.
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:
Some fun C++ highlights with slides available include:
By Blog Staff | May 15, 2014 09:07 AM | Tags: None
Today on Bulldozer00:
Stopping the Spew!
by Tony DaSilva
From the article:
Every C++ programmer has experienced at least one, and most probably many, “Template Spew” (TS) moments. You know you’ve triggered a TS moment when, just after hitting the compile button on a program the compiler deems TS-worthy, you helplessly watch an undecipherable avalanche of error messages zoom down your screen at the speed of light. ...
... Fear not, because help is on the way via C++14 in the form of "concepts lite".
By Blog Staff | May 12, 2014 08:31 AM | Tags: basics
Quick A: They generate a templated operator(), and that means you can call the same closure object with all sorts of different parameters and it just stamps out the function for each set of parameter types.
A "new classic" question on SO, classic because it was posted a year ago, but newly relevant because now the mainstream compilers are implementing the feature:
How does generic lambda work in C++14?
How does generic lambda work (
autokeyword as argument type)?Is it similar to templates where for each different argument type compiler generates functions with the same body but changed types or is it more similar to Java's generics?
Code example:
auto glambda = [](auto a) { return a; };