Emscriptened -- Adi Shavit
The `path` to the web.
Emscriptened!
by Adi Shavit
From the article:
It might be a fun little project to generate a web-based interactive version of the effects of various methods of `filesystem::path`.
News
C++17 Talks by Nicolai Josuttis @ NDC London
Nicolai Josuttis speaks on the upcoming NDC conference in London about:
C++17 Core and Library Features
by Nicolai Josuttis
About the talk:
On January 19, 2017, Nicolai Josuttis, the author of The C++ Standard Library, will give two talks at the NDC conference in London about the core and library features of the upcoming C++17.
Return early and clearly--Arne Mertz
How to return well:
Return early and clearly
by Arne Mertz
From the article:
There are different guidelines out there about where and how many return statements to use in a function, e.g. return only once at the end of the function or return early and often. Which one makes for the most readable code?
CppCast Episode 83: Regular Void with Matt Calabrese
Episode 83 of CppCast the only podcast for C++ developers by C++ developers. In this episode Rob and Jason are joined by Matt Calabrese to talk about his Regular Void Proposal, template<auto>, the state of Concepts and more.
CppCast Episode 83: Regular Void with Matt Calabrese
by Rob Irving and Jason Turner
About the interviewee:
Matt Calabrese is a software engineer working primarily in C++. He started his programming career in the game industry and is now working on libraries at Google. Matt has been active in the Boost community for over a decade, is currently a member of the Boost Steering Committee, and is a member of the Program Committee for C++Now. Starting in the fall of 2015, he has been attending C++ Standards Committee meetings, authoring several proposals targeting the standard after C++17, notably including a proposal to turn the void type into an instantiable type and a proposal for the standard library to introduce a generic algorithm for invoking standard Callables with argument types and argument amounts that may be partially calculated at compile-time or at runtime. He is also the author of the controversial paper "Why I want Concepts, but why they should come later rather than sooner", which may have contributed to the decision to not include the concepts language feature in C++17.
Building a hybrid spin mutex in C++ -- Foster Brereton
Forster Brereton reports about his first steps to build a hybrid mutex.
Building a hybrid spin mutex in C++
by Foster Brereton
From the article
Blocking Mutexes
A blocking mutex will halt the thread until it acquisition. It is useful because it consumes negligible computer resources while blocked. This leaves the CPU free to perform other tasks, including whatever other task currently owns the mutex. All this goodness is not cheap, however: it takes a decent amount of time to block thread. If your critical section is brief, you could be spending a disproportionate amount of time protecting it instead of running it.
Generally, blocking mutexes should be used when your critical section will take a while, such as I/O operations, calling out to the OS, or doing laundry in a collegiate dorm.
Spinning Mutexes
A spinning mutex will enter into an infinite loop (spin) until acquisition. It is useful because it can resume very quickly once the lock has been obtained, resulting in minimal overhead while protecting a critical section. However, since the thread remains active on the CPU, it can reduce (or eliminate!) the ability of the CPU to do other work††. If your critical section is long, you could be spending a disproportionate amount of time protecting it instead of running it.
Generally, spin mutexes should be used when your critical section is brief, such as reading or writing a memory-resident data structure.Finding a middle ground
The dichotomy between the two mutex behaviors has left me stuck more than once. What if I was trying to protect a global resource that occasionally required a call to the OS? In those cases a blocking mutex is not a good fit, as modifying the memory-resident structure is pretty quick. However a spin mutex would be equally bad, because I do need to go to the OS time and again, and it would be a pessimization to spike a CPU while doing so.
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.
Flip, a new data model C++ framework focused on real time collaboration
Irisate has made available a demo package of Flip, a C++ Framework allowing for a fast, efficient and reliable implementation of concurrent editing by multiple users.
Flip, a new data model C++ framework focused on real time collaboration
by Gregory Makles
From the article:
Flip is a data model library designed as a framework. It is real-time, collaboration-oriented, transactional, portable, compact and can handle complex data structures.
Essential Features
- Single author applications can be adapted to support simultaneous co-authoring with no extra work
- Undo/Redo and history are automatically handled (no action classes)
- Copy/Paste can be done automatically, or refined to your needs and your data structure
- Allows for offline mode and three-ways merge
- Multi-threaded/multi-process architecture
- Transactional
- Server side is limited to data model code, making it less prone to bugs
- High stability
- Performance oriented, extensible, and future-proof document formats
- At the core of Ohm Studio's unrivaled collaboration solution
- Designed for easy integration with all kind of data structure, including decade(s) old ones
Registration is necessary to download Flip.
C++ Weekly Episode 42: Clang's Heap Elision—Jason Turner
Episode 42 of C++ Weekly.
Clang's Heap Elision
by Jason Turner
About the show:
In this episode Jason explores Clang's ability to elide heap operations during optimization.
Overload 136 is now available
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
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.