By Niks | Dec 21, 2016 04:45 AM | Tags: c++14 advanced
Quantification expresses the extent to which a predicate is true over a set of elements. This installment describes the use of predicate logic in metaprogramming.
Quantifiers, metaprogramming and concepts
by Nikos Athanasiou
From the article:
Metaprograms often use predicate logic in creative ways. For example, type queries in generic code are used to constrain, dispatch, specialize, activate or deactivate code at compile time.
By Adrien Hamelin | Dec 19, 2016 11:19 AM | Tags: None
ACCU’s Overload journal of December 2016 is out. It contains the following C++ related articles.
Overload 136 is now available
From the journal:
The MirAL Story
Description : The X-Windows system is all-pervasive but struggles with security and performance graphics. Alan Griffiths introduces Mir Abstraction Layer to deal with these issues. by Alan GriffithsOverloading with Concepts
Description : Concepts can play a role in function overloading. Andrew Sutton shows us how. by Andrew SuttonUltra-fast Serialization of C++ Objects
Description : Serialising and de-serialising is a common problem. Sergey Ignatchenko and Dmytro Ivanchykhin demonstrate one way to do this quickly. by Sergey Ignatchenko and Dmytro IvanchykhinModern C++ Features: User-Defined Literals
Description : User-defined literals were introduced in C++11. Arne Mertz walks us through their use. by Arne MertzPython Streams vs Unix Pipes
Description : Dealing with an infinite sequence requires some thought. Thomas Guest presents various ways to approach such a problem. by Thomas GuestLetter
Description : Silas S. Brown comments on Steve Love's recent article. by Silas S. BrownHello World in Go
Description : Go provides a way to write efficient concurrent programs in a C-like language. Eleanor McHugh shares a "Hello, world!" tutorial. by Eleanor McHugh
By Meeting C++ | Dec 16, 2016 10:48 AM | Tags: video performance intermediate experimental efficiency community c++14 c++11 boost basics advanced
A week full of video editing brings the first batch of Meeting C++ 2016 videos online:
More videos are online!
by Jens Weller
Meeting C++ 2016 Playlist
From the article:
With today, almost all videos from the A and all videos of the D Track are online. There is a recording issue with one talk in the A track, which might get resolved in 2017. Also since today, the Meeting C++ YouTube channel has more then 400k views!
The full video set you can find in the Meeting C++ 2016 Playlist, the newest videos are easily found by visiting the Meeting C++ YouTube channel or subscribing to this RSS feed.
By Adi | Dec 15, 2016 11:41 PM | Tags: c++17
A short stroll along filesystem::path.
Path Exploration
by Adi Shavit
From the article:
The “experimental” Filesystem TS has been with us for a few years living in the std::experiment namespace. With C++17 it will finally be merged into std.
By bfilipek | Dec 15, 2016 11:40 PM | Tags: None
Another explanation why const is a really powerful tool.
Please declare your variables as const
by Bartlomiej Filipek
From the article:
When using const the resulting code will be more verbose, explicit, cleaner (with probably smaller functions) and safer. Not to mention that you’ll get additional help from the compiler.
By Adrien Hamelin | Dec 14, 2016 03:05 PM | Tags: intermediate c++11
A good question with a good answer.
When noexcept?
by Edouard of quasardb
From the article:
In a previous post, we had a look at the new constexpr keyword that has been introduced in C++ 11. Today we'll study another new fancy specifier: noexcept...
By Adrien Hamelin | Dec 12, 2016 02:55 PM | Tags: experimental basics
The new if constexpr will change a good part of our code for the better!
Simplifying templates and #ifdefs with if constexpr
by Simon Brand
From the article:
if constexpris a C++17 feature which allows conditionally compiling code based on template parameters in a clear and minimal fashion. It is essentially an if statement where the branch is chosen at compile-time, and any not-taken branches are discarded without being instantiated...
By Vittorio Romeo | Dec 12, 2016 05:32 AM | Tags: c++14 advanced
Does [x = std::forward<decltype(x)>] behave like you expect?
capturing perfectly-forwarded objects in lambdas
by Vittorio Romeo
From the article:
Perfect forwarding and forwarding references allow developers to write generic template functions that retain the lvalueness/rvalueness of passed arguments [...] Let's try to use auto&&, std::forward and C++14's generalized lambda capture syntax to implement our desired semantics. [...] What we really want to do is:
- Capture by copy if a is an rvalue reference.
- Capture by reference if a is an lvalue reference.
[...]
By Adi | Dec 12, 2016 05:16 AM | Tags: c++14 advanced
More interesting facts about captureless lambdas.
Technical Debt
by Adi Shavit
From the article:
The series on captureless lambdas generated some interesting comments.
The articles discusses converting captureless lambdas into function pointers without explicitly specifying the cast-to type, calling conventions and standard conformance and a special callbackizing function for capturing lambdas.
By Adrien Hamelin | Dec 7, 2016 11:48 AM | Tags: experimental basics
The transformation is only a beginning towards catching up from C++98, but it does show why modern C++ features improve your code.
C++ 17 Transformation...
by phantom
From the article:
I'm basically really bad at working on my own projects, but with the recent release of Visual Studio 2017 RC and its improved C++17 support I figured it was time to crack on again...
To that end I've spent a bit of time today updating my own basic windowing library to use C++17 features. Some of the things have been simple transforms such as converting 'typedef' to 'using', others have been more OCD satisfying...