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 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 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 Meeting C++ | Dec 5, 2016 08:23 AM | Tags: tmp metaprogramming intermediate experimental c++20 c++17 c++14 advanced
And the second keynote of Meeting C++ 2016 is on youtube:
C++ Metaprogramming: evolution and future direction
by Louis Dionne
By Meeting C++ | Dec 5, 2016 02:51 AM | Tags: modules efficiency concepts c++20 c++17 c++14 c++11 basics advanced
Since yesterday this years opening keynote by Bjarne Stroustrup is on youtube:
What C++ is and what it will become
by Bjarne Stroustrup
By Jason Turner | Nov 29, 2016 09:52 AM | Tags: c++17 advanced
Episode 39 of C++ Weekly.
C++17's Deduction Guides
by Jason Turner
About the show:
C++17's automatic class template deduction feature brings with it a new sub-feature called "deduction guides" which are used to help the compiler with class template type deduction. Jason gives examples of what they are and how they are used in this episode.
By Adrien Hamelin | Nov 28, 2016 12:33 PM | Tags: experimental advanced
With the next version of C++.
Compose and curry as folds
by Nick Athanasiou
From the article:
In a previous post we introduced C++17 fold expressions and described a way to extend them for arbitrary callables. Implementation details don’t matter for what we’re elaborating on here but it should be clear that (given the tools we developed) the following is possible:
(Op<F>(args) + ...) (... + Op<F>(args))
By Adrien Hamelin | Nov 11, 2016 12:54 PM | Tags: performance advanced
A very interesting article about the cost of our basic operations.
Infographics: Operation Costs in CPU Clock Cycles
by “No Bugs” Hare
From the article:
Whenever we need to optimise the code, we should profile it, plain and simple. However, sometimes it makes sense just to know ballpark numbers for relative costs of some popular operations, so you won’t do grossly inefficient things from the very beginning (and hopefully won’t need to profile the program later �� )...
By Adrien Hamelin | Nov 7, 2016 12:02 PM | Tags: advanced
Do you know how a program ends?
Terminators
by Adi Shavit
From the article:
A GraphViz diagram that shows both normal and unexpected program termination flows in C++.
There are multiple ways a C++ program may terminate. These include both normal and unexpected termination.
This GraphViz diagram shows the program termination flows as defined by the standard...