Meeting C++ 2018 wrap up

by Jens Weller

Two weeks ago, Meeting C++ 2018 started. The first attendees got their badges and it was again this time of year for my staff, the volunteers and myself: conference time...

RangeOf: A better span

by Corentin Jabot

I don’t like span.

Since that article was posted, the committee improved span quite a bit by removing operator== and making it’s size() consistent with that of vector after a lot of discussions. And I mean a lot...

San Diego Committee Meeting: A Trip Report

by Corentin Jabot

As I left Rapperswil earlier this year, I said very firmly that I would not go to the San Diego Meeting.

Crossing an ocean to work on C++ 12 hours a day for a week is indeed madness.

And so naturally, I found myself in a San Diego hotel straight from the 60s, to do some C++ for a week. With the exception of the author of this blog, all people there are incredibly smart and energetic, and so a lot of great work was done...

Trip Report: Freestanding in San Diego

by Ben Craig

All three are dealing with "freestanding". I've been working for the last year or so trying to redefine freestanding in a way that would be useful to more people. I have personal experience using C++ in various operating system kernels / drivers, and a bit of experience working on micro controllers and digital signal processors, so that's where my papers focused. At the CppCon 2018 SG14 meeting, some GPU companies have said that my definitions are useful for their architectures (with some tweaks), and I've heard from several other people that my definitions are even useful in some environments where performance and determinism are key, even when there is an OS. I'm still trying to figure out if and how to incorporate all these groups into one thing that could get standardized.

I pitched "Freestanding Proposal" at my first WG21 meeting was November of 2017 in Albuquerque. I was an unknown then. San Diego was my third WG21 meeting. All the papers and interviews and trip reports have now made it where people were asking me about freestanding quite frequently. There were a few times I got stopped while walking around by someone I had never talked to before, and they knew who I was, and asked about freestanding. I found this very flattering. I'm thrilled (and terrified) that my work is getting such visibility...

C++ Coroutine TS — It’s about inversion of control!

by Buckaroo

Many people look at the Coroutines TS and wonder, what is all of the fuss about?

This article gives you one motivating example where lazy sequences enable you to seperate your concerns and maximize code reuse without increasing complexity...

2018 San Diego ISO C++ Committee Trip Report

The ISO C++ Committee met in San Diego, California ���� last week to continue work on the next International Standard (IS), C++20. This meeting was the last meeting to consider new proposals for C++20, but existing proposals like modules (on track) and coroutines (questions remain) that are in flight but not merged can still make C++20. We’ll make our final decisions about major language features at the next meeting.

Use the official range-v3 with MSVC 2017 version 15.9

by CoderCasey

We’re happy to announce that the ongoing conformance work in the MSVC compiler has reached a new milestone: support for Eric Niebler’s range-v3 library. It’s no longer necessary to use the range-v3-vs2015 fork that was introduced for MSVC 2015 Update 3 support; true upstream range-v3 is now usable directly with MSVC 2017.

Modules Are Not Precompiled Headers

by Guillaume Racicot

Modules have been the subject of many controversies in the C++ community in the recent past and there seem to be some misconception floating around recently about modules. Important decisions will soon be made, and I wanted to clear some of the facts and raise potentially good questions about modules and the path to their adoption.

I do not want to argue about how modules should have been and what should have not been. Instead I want to talk tabout modules as they are today, in the merged proposal.

Five Awesome C++ Papers for San Diego

By Bartlomiej Filipek

In two weeks there will be a next C++ Committee meeting. This time the group of C++ experts will travel to San Diego, and they will discuss the shape of the upcoming C++ Standards. As far as I know, the meeting will hold a record in the number of submissions (276 proposals!) So it seems that the session will be quite exhausting

Here’s my list of five exciting papers that will be discussed during the meeting. I tried to pick something less popular, and usually smaller than significant features like modules, concepts or ranges...

Mathematics behind Comparison #4: Three-Way Comparison

by Jonathan Müller

In order to sort a collection of elements you need to provide a sorting predicate that determines when one element is less than the other. This predicate must “induce a strict total ordering on the equivalence classes” according to cppreference. Wait, what?

The upcoming C++ spaceship operator implements a three-way comparison, i.e. it is a single function that can return the results of <, == and > combined. But related to it are terms like “strong equality” and “weak ordering” which are somewhat confusing if you don’t have the mathematical background.

So let’s untangle it: This series will explain both the mathematics behind equality and ordering, as well as give concrete guidelines for implementing the comparison operators and the spaceship operator.

Now that we’ve covered both equivalence and ordering relations we can finally talk about the spaceship operator and three-way comparisons...