October 25, Pavia, Italy
November 6-8, Berlin, Germany
November 3-8, Kona, HI, USA
By Blog Staff | Oct 1, 2014 06:16 AM | Tags: None
We don't normally link to pleas to spam mass-email anyone, never mind Bjarne Stroustrup, but we just had to share this heartfelt plea because it would be Good for the World. (Sorry, Dr. Stroustrup!)
But even if you don't email him, read or re-read D&E. It's still quite current.
And In the Beginning...
by Tony DaSilva
From the article:
I’m on my second pass through Bjarne Stroustrup’s "The Design And Evolution Of C++". In the book...
By Blog Staff | Oct 1, 2014 06:11 AM | Tags: None
From the CppCon blog:
2014 Videos Online
We are announcing the CppCon Channel on YouTube with the first uploads of our video from CppCon 2014.
Our first videos feature our three keynote presentations from Bjarne Stroustrup, Mark Maimone, and Mike Acton; as well as our opening and closing plenary sessions from Scott Meyers and Herb Sutter.
Over the next few weeks we’ll be uploading videos of most of the conference sessions including panels, lightning talks, and over one hundred sessions from the six tracks that made up the core of our conference program. The first two of our regular session uploads are from Michael Caisse and Thomas Rodgers.
We’d like to thank the speakers for allowing these sessions to be recorded and shared and Bash Films for the production of these videos.
By Blog Staff | Sep 30, 2014 09:51 AM | Tags: None
Quick A: Because noexcept doesn't have to keep track of stack unwinding.
noexcept, stack unwinding, and performance
The following draft from Scott Meyers new C++11 book says (page 2, lines 7-21)
The difference between unwinding the call stack and possibly unwinding it has a surprisingly large impact on code generation. In a
noexceptfunction, optimizers need not keep the runtime stack in an unwindable state if an exception would propagate out of the function, nor must they ensure that objects in anoexceptfunction are destroyed in the inverse order of construction should an exception leave the function. The result is more opportunities for optimization, not only within the body of anoexceptfunction, but also at sites where the function is called. Such flexibility is present only fornoexceptfunctions. Functions with “throw()” exception specifications lack it, as do functions with no exception specification at all.In contrast, section 5.4 of "Technical Report on C++ Performance" describes the "code" and "table" ways of implementing exception handling. In particular, the "table" method is shown to have no time overhead when no exceptions are thrown and only has a space overhead.
My question is this - what optimizations is Scott Meyers talking about when he talks of unwinding vs possibly unwinding? Why don't these optimizations apply for
throw()? Do his comments apply only to the "code" method mentioned in the 2006 TR?
By Blog Staff | Sep 29, 2014 01:00 AM | Tags: None
If you're going to SVCC'14, check out the C++ sessions:
Fun with C++14 Lambdas at Silicon Valley Code Camp
by Sumant Tambe
From the article:
Believe it or not, but the 9th Silicon Valley Code Camp is less than 2 weeks away and I can't wait to be at the largest software technology conference setup by developers for developers -- and here is the best part -- at no cost to the attendees. So far, there are 234 registered sessions, 7 technical tracks, and over 3100 registrations. So mark your calendar -- it's October 11th and 12th, Saturday and Sunday, as always.
C++ is hot again at SVCC and third year in a row there is a dedicated track for modern C++...
By Blog Staff | Sep 29, 2014 12:24 AM | Tags: intermediate
Recently on StickyBits, a nice primer on variadics:
Variadic Templates
by feabhas
From the article:
In this article we’re going to look at a new feature of templates in C++11 -- the concept of the variadic template.
Variadic templates allow us to create functions and classes, not only with generic types, but also a variable number of generic types.
If you haven’t been following along with the template articles, I’d suggest you read this article first before continuing.
By Blog Staff | Sep 29, 2014 12:09 AM | Tags: None
Bulldozer00's appreciation for Alex Stepanov's introduction for Bjarne Stroustrup at CppCon. We already linked to the video last week -- but if you didn't watch it then, do yourself a favor and spend 6 minutes now getting your workweek off to a great start.
A Grand Introduction
by Tony DaSilva
From the article:
"We should not be ashamed of bits. We should be proud of them." -- Alex Stepanov
You may not interpret it in the same way as I did, but I found this cppcon conference introduction of Bjarne Stroustrup by programming scholar Alex Stepanov very moving...
By Blog Staff | Sep 26, 2014 01:12 PM | Tags: None
A new WG21 paper is available. If you are not a committee member, please use the comments section below or the std-proposals forum for public discussion.
Document number: N4149
Date: 2014-09-25
Categorically qualified classes
by David Krauss
Excerpt:
Some classes only work in certain contexts: scope guards are usually useless as subexpressions, and expression template placeholders malfunction as local variables. An unused function result may signal that the caller intends to follow a different protocol, such as with
std::async. This proposal extends class definitions to prevent such errors, and adds a mechanism to automatically resolve them by type substitution, such as a value type for an expression template. Additionally, generation of non-movable objects becomes more tractable.The added functionality includes that of the “auto evaluation” proposals [1]. This proposal intends to be more expressive, more broadly applicable, and easier to adopt and use.
By Blog Staff | Sep 26, 2014 01:09 PM | Tags: None
A new WG21 paper is available. If you are not a committee member, please use the comments section below or the std-proposals forum for public discussion.
Document number: N4148
Date: 2014-09-24
Disallowing Inaccessible Operators From Trivially Copyable
by Matheus Izvekov
Excerpt:
This proposal aims to solve a serious flaw in the definition of the trivially copyable concept. Presently, classes with deleted or inaccessible copy/move constructors, copy/move assignment operators and destructor are allowed to be trivially copyable, which might seem counterintuitive.
By Blog Staff | Sep 26, 2014 01:05 PM | Tags: None
A new WG21 paper is available. If you are not a committee member, please use the comments section below or the std-proposals forum for public discussion.
Document number: N4147
Date: 2014-09-25
Inline variables, or encapsulated expressions
by David Krauss
Excerpt:
Inline functions have favorable behavior for interfaces which cannot be exposed as objects. Often, users are encouraged to use them to wrap global variables, despite unnatural boilerplate. Other workarounds include class static data members, enumerators, macros, and variable templates, all with awkward syntax or downsides and limited applicability. This proposal defines the inline specifier on variable definitions to indicate semantics similar to
inlinefunction evaluation and linkage. More generally, this produces a facility for named values, or variables without persistence, which may supersede or complement the various workarounds.
By Blog Staff | Sep 26, 2014 01:03 PM | Tags: None
A new WG21 paper is available. If you are not a committee member, please use the comments section below or the std-proposals forum for public discussion.
Document number: N4146
Date: 2014-09-23
Disposition of Comments, ISO/IEC DIS 14882, C++ 2014
by Barry Hedquist
Excerpt:
Attached is WG21 N4146, the Disposition of Comments for ISO/IEC DIS 14882, Draft Information Standard ISO/IEC 14882:2014.
Document numbers referenced in the ballot comments are WG21 documents unless otherwise stated.