By Adrien Hamelin | Jul 20, 2016 02:08 PM | Tags: performance advanced
Here is a curious behaviour:
Zeroing Memory is Hard (VC++ 2015 arrays)
by Bruce Dawson
From the article:
Quick, what’s the difference between these two C/C++ definitions of initialized local variables?
char buffer[32] = { 0 }; char buffer[32] = {};One difference is that the first is legal in C and C++, whereas the second is only legal in C++.
Okay, so let’s focus our attention on C++. What do these two definitions mean?
By Adrien Hamelin | Jul 20, 2016 02:05 PM | Tags: boost advanced
Have you registered for CppCon 2016 in September? Don’t delay – Registration is open now.
While we wait for this year’s event, we’re featuring videos of some of the 100+ talks from CppCon 2015 for you to enjoy. Here is today’s feature:
Integrating generators EDSL's for Spirit X3 (WIP)
by Feliple Magno de Almeida
Summary of the talk:
Based on the presentation I made on C++Now 2015 for Developing EDSL's for Boost.Spirit V2, present the development of generators for Boost.Spirit X3 (next version of boost spirit) and how that can be used for higher abstraction EDSL's while, through template metaprogramming, create parsers and generators automatically from the same grammar, using CORBA format as an example, while dealing with endianness, alignment and asymmetric grammars. This work is based on the library mORBid (https://github.com/expertisesolutions...) and (https://github.com/expertisesolutions...).
By Marco Arena | Jul 20, 2016 07:09 AM | Tags: c++14 basics
In this installment we’ll meet associative containers:
C++ in Competitive Programming: associative containers
by Marco Arena
From the article:
Some days ago I gave my birthday party and I invited some friends. I want to know which name is the most common among my friends. Or, given a sequence of words, I want to know which one occurs the most...
By Meeting C++ | Jul 20, 2016 02:01 AM | Tags: intermediate experimental c++17 c++14 boost advanced
With the announcement of the closing keynote the full schedule for Meeting C++ 2016 stands!
Closing keynote & full schedule of Meeting C++ 2016
by Jens Weller
From the article:
Since mid of June the program of the 5th Meeting C++ conference was taking shape. With the selection of the talks it was also clear in which tracks they go, so that the schedule it self was almost ready, except a last detail: the closing keynote.
The closing keynote will be held by Louis Dionne on "C++ metaprogramming: evolution and future directions".
By Adrien Hamelin | Jul 19, 2016 02:02 PM | Tags: experimental advanced
C++ continues to evolve:
Red Hat at the ISO C++ Standards Meeting (June 2016, Oulu): Library
by JWAKELY
From the article:
The recent WG21 meeting in Oulu, Finland, was an especially busy one for the Library Working Group. Every day was spent working through the list of proposals intended for inclusion in C++17, and we also had three “evening” sessions that ran well past the evening (until nearly midnight, although the sun was still up to trick us into working late)...
By Adrien Hamelin | Jul 19, 2016 02:00 PM | Tags: experimental advanced
C++ continues to evolve:
Red Hat at the ISO C++ Standards Meeting (June 2016, Oulu): Core Language
by Jason Merrill
From the article:
It was quite a trek to get to Oulu, Finland for the June 2016 C++ Standards Committee meeting, but we were warmly received and the meeting went well once we arrived. We had very pleasant weather most of the week, and it was fun to experience the midnight sun, even though it played havoc with my sleep schedule.
By Adrien Hamelin | Jul 19, 2016 01:55 PM | Tags: experimental advanced
C++ continues to evolve:
Red Hat at the ISO C++ Standards Meeting (June 2016, Oulu): Parallelism and Concurrency
by Torvald Riegel
From the article:
Several Red Hat engineers recently attended the JTC1/SC22/WG21 C++ Standards Committee meetings in Oulu, Finland. This post focuses on the sessions of SG1 (the standards committee sub-group 1 – for concurrency and parallelism) as well as on coroutines-related sessions. Jason already gave an overview of the meeting in his post.
By Adrien Hamelin | Jul 18, 2016 01:31 PM | Tags: c++11 basics
Quick A: To express constness, a const reference is what is needed.
Recently on SO:
How to express constness of a forwarding reference?
How can I express that f does not modify its parameter?If the function doesn't modify its parameter then there is no benefit to using a forwarding reference. You use a forwarding reference when you want to forward the parameter on to some other function which cares whether the argument is an lvalue or an rvalue (because maybe there are separate overloads for lvalues and rvalues, and the rvalue one can be more efficient).
If your function doesn't modify the argument then it shouldn't need to care whether it has an lvalue or rvalue, so it can just take
const T&unconditionally. That can bind to both lvalues and rvalues, and promises not to modify the parameter.template<typename T> void f(const T& t) { ... }
By Adrien Hamelin | Jul 18, 2016 01:28 PM | Tags: community basics
Quick A: Not in the standard, but in other libraries yes.
Recently on SO:
Is there a range class in C++11 for use with range based for loops?
The C++ standard library does not have one, but Boost.Range has boost::counting_range, which certainly qualifies. You could also use boost::irange, which is a bit more focused in scope.
By Adrien Hamelin | Jul 18, 2016 01:22 PM | Tags: experimental efficiency
Have you registered for CppCon 2016 in September? Don’t delay – Registration is open now.
While we wait for this year’s event, we’re featuring videos of some of the 100+ talks from CppCon 2015 for you to enjoy. Here is today’s feature:
Large Scale C++ with Modules: What You Should Know
by Gabriel Dos Reis
Summary of the talk:
“Modules” are a frequently requested and long-awaited feature by C++ programmers. In a nutshell, the idea is to have a direct language support for (a) expressing the boundaries and dependencies of a program component; (b) isolating source codes from macro vagaries; (c) scaling compile time, especially for large projects, given the ubiquity of “headers-only” template libraries; (d) spur innovation and deployment of semantics-aware developer tools.
This presentation will focus on three major points: (1) the design of the module proposal currently being considered by the C++ standards committee (design goals, properties, constraints); (2) implementations currently under way; and (3) early user experience and migration.
Modules directly address a problem (scalability) listed as one of the three major areas where C++17 is expected to significantly improve daily experience of the working C++ programmer. Naturally, this feature is also on the top ten list of C++17 functionalities Bjarne Stroustrup put forward in his “Thought on C++17.”