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Quantifiers, metaprogramming and concepts—Nikos Athanasiou

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.

More Meeting C++ 2016 videos are online!

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.

Capturing perfectly-forwarded objects in lambdas—Vittorio Romeo

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.

[...]

Technical Debt - More Captureless Lambda Fun—Adi Shavit

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.