October 25, Pavia, Italy
November 6-8, Berlin, Germany
November 3-8, Kona, HI, USA
By Blog Staff | Nov 21, 2014 09:08 AM | Tags: None
Freshly pressed from Andrzej:
Boost Library Incubator
by Andrzej Krzemieński
From the article:
Today, I wanted to draw your attention to the new initiative driven by Robert Ramey: Boost Library Incubator. It is a place where one can put C++ libraries targeted for inclusion into Boost...
By Blog Staff | Nov 21, 2014 04:31 AM | Tags: None
Quick A: Yes.
Recently on SO:
Idiomatic way to declare C++ immutable classes
So I have some pretty extensive functional code where the main data type is immutable structs/classes. The way I have been declaring immutability is "practically immutable" by making member variables and any methods const.
struct RockSolid { const float x; const float y; float MakeHarderConcrete() const { return x + y; } }Is this actually the way "we should do it" in C++? Or is there a better way?
By Blog Staff | Nov 20, 2014 10:41 AM | Tags: None
News about Cevelop, a C++ IDE for professional developers from the Institute for Software at HSR Hochschule für Technik:
Cevelop Updated for the Eclipse Luna Service Release 1
by Mirko Stocker
From the announcement:
We have rebased Cevelop on top of the latest Eclipse Luna Service Release SR1. The Eclipse CDT team used the chance to include some new features. For example, code completion can now show default arguments and gives you more information on template parameters... See the CDT 8.5 changelog for a comprehensive list of changes.
By Blog Staff | Nov 20, 2014 04:25 AM | Tags: None
Quick A: 1. Those cases are not equivalent. 2. Emplace is more for when you don't already have a named object of the correct type...
Recently on SO:
Efficiency of C++11 push_back() with std::move versus emplace_back() for already constructed objects
In C++11
emplace_back()is generally preferred (in terms of efficiency) topush_back()as it allows in-place construction, but is this still the case when usingpush_back(std::move())with an already-constructed object?For instance, is
emplace_back()still preferred in cases like the following?std::string mystring("hello world"); std::vector<std::string> myvector; myvector.emplace_back(mystring); myvector.push_back(std::move(mystring)); // (of course assuming we don't care about using the value of mystring after)Additionally, is there any benefit in the above example to instead doing:
myvector.emplace_back(std::move(mystring));or is the move here entirely redundant, or has no effect?
By Blog Staff | Nov 19, 2014 04:17 AM | Tags: None
Quick A: Try vector<shared_ptr<boost::any>>.
Recently on SO:
Array of shared pointers to different classes
I am new to c++11 programming and now I'm trying to figure out if it is possible to create an array of shared pointers to different types. For example, something like that:
vector<shared_ptr<**???**>> v; v.push_back(shared_ptr<int>(new int)); v.push_back(shared_ptr<MyClass>(new MyClass()));or any other way to pass
shared_ptrwithout knowing its type.
By Blog Staff | Nov 18, 2014 01:32 PM | Tags: None
This just in on CppCon.org:
Video Availability Increased
As of today, CppCon 2014 session videos are available on Channel 9 at: http://channel9.msdn.com/Events/CPP/C-PP-Con-2014
The videos were originally made available and are still available on the CppCon YouTube channel at: https://www.youtube.com/CppCon
After posting the videos on YouTube, we received requests for additional availability from countries where YouTube is not available. We’ve worked with Channel 9 to be an additional hosting site. Channel 9 is available in countries where YouTube is not, so this helps us in our goal of supporting C++ developers all over the world.Channel 9 also supports downloading the sessions in a number of formats, including audio only, for offline use.
The CppCon 2014 conference videos feature are over 100 sessions of C++ content from many of the world’s best C++ experts, all professionally recorded and edited by Bash Films. We are grateful to both YouTube and Channel 9 for hosting our content.
By Blog Staff | Nov 18, 2014 01:26 PM | Tags: None
Following the recent ISO C++ meeting hosted by Riverbed and the University of Illinois at Urbana-Champaign, the University posted this summary of the event:
Illinois Hosts International C++ Standards Conference
By Tom Moone
The article includes a link to Bjarne Stroustrup's talk to the faculty and students:
Illinois was selected as the location for this conference for two reasons. First, the location was capable of providing a week’s worth of meeting space for the 100 or so attendees in plenary and breakout sessions from 8 a.m. to 10 p.m. Second, the department, together with the local office of Riverbed Technology, offered to host the conference. “We are entirely dependent on being invited,” explained Sutter. “So we are very grateful to the department for accommodating us.”
On Monday evening of the conference, Stroustrup gave a talk as part of the CS Department’s Distinguished Lecture Series titled “C++ as a Modern Language.” In the talk he explained how to program in that language using type safety, resource safety, unmatched performance, and a terse notation. Enthusiasm for this lecture was literally overwhelming as the audience filled auditorium in the Siebel center to standing room only, and two overflow rooms were opened up to watch the talk with a live stream.
By Blog Staff | Nov 17, 2014 03:18 AM | Tags: None
In case you missed it:
Functional Programming in C++
by John Carmack
From the article:
... My pragmatic summary: A large fraction of the flaws in software development are due to programmers not fully understanding all the possible states their code may execute in. In a multithreaded environment, the lack of understanding and the resulting problems are greatly amplified, almost to the point of panic if you are paying attention. Programming in a functional style makes the state presented to your code explicit, which makes it much easier to reason about, and, in a completely pure system, makes thread race conditions impossible.
I do believe that there is real value in pursuing functional programming, but it would be irresponsible to exhort everyone to abandon their C++ compilers and start coding in Lisp, Haskell, or, to be blunt, any other fringe language...
By Blog Staff | Nov 14, 2014 09:37 AM | Tags: basics
Quick A: A compiler-generated type that stores the captured variables in its data members, and exposes the function signature and body as its operator().
Recently on SO:
What type do lambdas get compiled into?
As I know all data types must be known at compile time, and lambda is not a type. Does lambda got translated into anonymous struct with operator() or std::function wrapped?
For example,
std::for_each(v.begin(), v.end(), [](int n&){n++;});
By Blog Staff | Nov 13, 2014 08:37 PM | Tags: experimental advanced
We like to link to articles at all levels. This one's near the top of the scale, for those looking for a real challenge:
Tiny Metaprogramming Library
by Eric Niebler
As the intro says [emphasis ours]:
(Difficult-to-grok metaprogramming below. Not for the faint of heart.)
From the rest of the introduction:
At the recent Urbana-Champaign meeting of the C++ Standardization Committee, Bill Seymour presented his paper N4115: Searching for Types in Parameter Packs which, as its name suggests, describes a library facility for, uh, searching for a type in a parameter pack, among other things. It suggests a template called
packerto hold a parameter pack:// A class template that just holds a parameter pack: template <class... T> struct packer { };Many of you are probably already familiar with such a facility, but under a different name:
// A class template that is just a list of types: template <class... T> struct typelist { };It became clear in the discussion about N4115 that C++ needs a standard
typelisttemplate and some utilities for manipulating them. But what utilities, exactly? ...