Meeting C++ is on Patreon

By Meeting C++ | Mar 30, 2018 02:03 AM | Tags: meetingcpp community

Meeting C++ launched a new community on Patreon:

Starting a new Community at Patreon

by Jens Weller

From the article:

Something new: you can now support Meeting C++ through Patreon!

This will go mostly into videos & video interviews and the Meeting C++ blog. I started doing my own videos and video interviews on YouTube last year, and to compliment that, I decided to also start a community of supporters on patreon. You'll be able to know guests of Meeting C++ & friends ahead of time and be able to suggest potential questions to ask...

Guidelines For Rvalue References In APIs--Jonathan Müller

By Adrien Hamelin | Mar 29, 2018 03:39 PM | Tags: c++11 advanced

Everything you need to know.

Guidelines For Rvalue References In APIs

by Jonathan Müller

From the article:

I’ll be giving a talk at ACCU about when to use which pointer types and why.

While working on that I made some guidelines for rvalue references in interfaces which didn’t quite fit the talk, so I’m writing about them here.

When should you use rvalue references as function parameters?

When as return types?

What are ref-qualified member functions and when and how should you use them?

Let’s tackle it one by one...

My Little (String) Optimization, Part 2--Jordan Rose

By Adrien Hamelin | Mar 29, 2018 03:15 PM | Tags: performance c++11

Performance!

My Little (String) Optimization, Part 2

by Jordan Rose

From the article:

Previously, I talked about how Clang is smart enough to optimize a series of comparisons against constant strings in C++ by starting out with a switch on the length. I left off with the idea that while this is good, you might be able to do better if your strings have a unique character at a certain offset. Today we’re going to see what that looks like.

Freestanding trip report: emBO++ and Jacksonville wg21 2018 experience-Ben Craig

By Adrien Hamelin | Mar 29, 2018 03:13 PM | Tags: experimental community

A good experience.

Freestanding trip report: emBO++ and Jacksonville wg21 2018 experience

by Ben Craig

From the article:

I'm the author of P0829, Freestanding Proposal. The tl;dr of the paper is that it standardizes a subset of the library suitable for kernel and embedded programming. R0 of this poorly titled paper was reasonably well received in the Albuquerque 2017 meeting. I was encouraged to send it out to a wider audience... and so I did. One of the people that I sent it to was Odin Holmes, and that got me an invitation to emBO++, my first speech at a public conference. This conference was the week prior to the Jacksonville meeting, so I ended up flying from Bochum to Jacksonville without going home first...

ISO C++ Committee – Jacksonville 2018, trip report -- Timur Doumler

By Anastasia Kazakova | Mar 29, 2018 06:53 AM | Tags: c++20

Timur Doumler has joined the CLion team in fall 2017. He continues to be active on the C++ Committee, as it fits well into JetBrains' strategy: our C++ team would like to be actively involved in the committee and feed our experience with implementing language features in our C++ tools back into the ongoing work on the evolution of the C++ language.

ISO C++ Committee – Jacksonville 2018 trip report

by Timur Doumler

From the article:

From the 12th to the 17th of March 2018, I travelled to Jacksonville, Florida, to attend the ISO C++ Committee meeting as JetBrains’ representative on the committee. I decided to focus on Evolution Working Group and cover the most relevant discussions concerning language evolution:

• Day 1: Structured bindings and concepts
• Day 2: Let’s break some code!
• Day 3: Coroutines and Modules
• Day 4: Compile-time programming
• Day 5: New Tooling Study Group
• Day 6: Plenary

CLion 2018.1 is released: more C++17, WSL, CMake Install, Fortran and Rust plugins -- JetBrains

By Anastasia Kazakova | Mar 29, 2018 06:52 AM | Tags: None

A new release is here!

Give Your Old C/C++ Code Some New Love -- Richard Thomson

By Legalize Adulthood | Mar 29, 2018 06:49 AM | Tags: None

This article explores how to modernize your legacy C/C++ code base, using an open source fractal renderer originally written in C and x86 assembly language as the case study.

Give Your Old Code Some New Love

by Richard Thomson

From the article:

If you’re not careful, entropy creeps its way into your code base. You take a shortcut or code something in a way that you know is sloppy and you say to yourself “I’ll come back to that later”, but later you’re faced with new feature requests or some other Imminent Disaster(tm) and you don’t go back and clean up the mess you made earlier. This is only natural in a code base and when the messes are few and far between, it is tolerable.

[...]

In this post, we’ll take a look at an open source project with a code base that is over 30 years old and has accumulated some “cruft” along the way. We’ll discuss various strategies for coping with the cruft and how to get rid of it in as safe a manner as possible. After all, we don’t want to introduce bugs while we clean up cruft.

PVS-Studio is now available on macOS: 64 weaknesses in the Apple's XNU Kernel

By Andrey Karpov | Mar 28, 2018 05:16 AM | Tags: xnu kernel static code analysis pvs-studio macos bugs

A new version of the PVS-Studio analyzer 6.23 is working under macOS, which allows you to check the projects written in C and C++. Our team decided to perform a XNU Kernel check to coincide it with this event.

PVS-Studio is now available on macOS: 64 weaknesses in the Apple's XNU Kernel

by Andrey Karpov

From the article:

Although the XNU Kernel is relatively small, it's a challenge to study the analyzer warnings alone, which takes much time. False positives make the check more complicated, since I haven't performed the preliminary analyzer configuration. I just quickly looked through the warnings, writing out code fragments that, in my opinion, represent interest. This is more than enough for writing a quite large article. PVS-Studio analyzer easily finds a large number of interesting bugs.

Emulating templated generic lambda expressions -- Krzysztof Ostrowski

By fj | Mar 25, 2018 11:36 PM | Tags: None

Embedding and recovering the type information in generic lambda expressions.

Emulating templated generic lambda expressions

by Krzysztof Ostrowski

From the article:

One of the greatest advantages of lambda expressions is their locality. It is really comfortable to reason about the code if the most of its parts are in the "near" scope, and the inversion of control is limited. On the other hand, optimiser's life is much easier with lambdas (they are just syntactic sugar, thus their actual structure is defined by the compiler). Moreover, lambdas' opaque mangled names can drastically reduce compile times. Parametrically polymorphic (generic) lambda expressions introduce additional flexibility in algorithm implementation and minimise maintenance work.

Paradoxically, generic lambda expressions in C++17 are somewhat too generic. That characteristic announces itself in inability to fix the lambda parameters in advance. Unlike in function templates, we cannot specify the parameter types explicitly to effectively disable template argument deduction from the passed function arguments.

Some steps towards templated generic lambdas are going to be taken in C++20. For the time being, a simple technique that emulates templated generic lambdas proposed in this article may be reused.

HPX V1.1 released -- STE||AR Group

By Hartmut Kaiser | Mar 24, 2018 07:20 AM | Tags: performance parallelism heterogeneous computing distributed computing c++17 c++14 c++11

The STE||AR Group has released V1.0 of HPX -- A C++ Standard library for parallelism and concurrency.

HPX V1.1 Released

The newest version of HPX (V1.1) is now available for download! Please see here for the release notes.

HPX exposes an API fully conforming to the concurrency related parts of the C++11/C++14/C++17 standards, extended and applied to distributed and heterogeneous computing, and aligned with the ongoing standardization discussions.

    HPX is a general purpose parallel C++ runtime system for applications of any scale. It implements all of the related facilities as defined by the C++ Standard. As of this writing, HPX provides the only widely available open-source implementation of the new C++17 parallel algorithms. Additionally, HPX implements functionalities proposed as part of the ongoing C++ standardization process, such as large parts of the C++ Concurrency TS, task blocks, data-parallel algorithms, executors, index-based parallel for loops, and many more. It also extends the existing C++ Standard APIs to the distributed case (e.g. compute clusters) and for heterogeneous systems (e.g. GPUs).
    HPX seamlessly enables a new asynchronous C++ Standard Programming Model which tends to improve the parallel efficiency of our applications and helps reduce complexities usually associated with concurrency