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Trip Report: ISO C++ Meeting Cologne (2019) -- Matthias Gehre

By Matthias Gehre | Sep 15, 2019 12:12 AM | Tags: None

Matthias Gehre’s trip report of the ISO C++ committee meeting in Cologne in 2019.

Trip Report: ISO C++ Meeting Cologne (2019)

by Matthias Gehre

From the trip report:

This is my trip report of the ISO C++ Meeting in Cologne – my first ISO C++ Meeting.

I will not so much focus on the big features that were approved for C++20 (there are better reports),

but more describe my personal experience. The report also contains discussions on

many lesser-known papers.

CppCon 2018: Nano-coroutines to the Rescue! (Using Coroutines TS, of Course)--G. Nishanov

By Adrien Hamelin | Sep 11, 2019 11:50 AM | Tags: experimental community

We’re in the final countdown to this year’s CppCon, which starts on September 16. To whet your appetite for this year’s conference, here’s another of the top-rated talks from last year. Enjoy – and register today for CppCon 2019!

Nano-coroutines to the Rescue! (Using Coroutines TS, of Course)

by G. Nishanov

Summary of the talk:

Are you doing memory lookups in a huge table?
Does your embarrassingly random access to your lookup tables lead to memory stalls?

Fear no more!

We will explore techniques that allow us to do useful work while the prefetcher is busily working on bringing the requested cache lines from main memory, by utilizing nano-coroutines.

And the best part, nano-coroutines can be easily implemented using Coroutines TS that is already available in MSVC and Clang compilers. With a little bit of library support we can utilize the coroutines to extract intra-thread parallelism and quadruple the speed up your lookups.

C++ Core Guidelines: Profiles--Rainer Grimm

By Adrien Hamelin | Sep 11, 2019 11:43 AM | Tags: community

To continue in the next one.

C++ Core Guidelines: Profiles

by Rainer Grimm

From the article:

Informally, profiles are a subset of rules of the C++ core guidelines for specific concerns such as type safety, bounds safety, and lifetime safety. Thanks to the guideline support library, they can be checked...

Cppcon-Tool Time 2019--Jon Kalb

By Adrien Hamelin | Sep 11, 2019 11:41 AM | Tags: community

Will you attend?

Tool Time 2019

by Jon Kalb

From the article:

Similar to tech labs at some other events, we’re offering the opportunity for anyone, from an author/creator, to a vendor, to a super-user, to represent a tool (app, library, framework, or service) and run their own table answering questions or showing demos...

C++20 Concepts Are Here in Visual Studio 2019 version 16.3

By TartanLlama | Sep 11, 2019 12:26 AM | Tags: c++20

Compiler and library support for concepts is now available in Visual Studio 2019.

C++20 Concepts Are Here in Visual Studio 2019 version 16.3

by Xiang Fan

From the article:

C++20 Concepts are now supported for the first time in Visual Studio 2019 version 16.3 Preview 2. This includes both the compiler and standard library support.

First, we’re debuting the feature via /std:c++latest mode and once we have all C++20 features implemented across all Visual Studio products (compiler, library, IntelliSense, build system, debugger, etc.), we’ll provide them through a new /std:c++20 mode.

C++17 - The Complete Guide now complete and available -- Nicolai M. Josuttis

By Nico Josuttis | Sep 10, 2019 11:43 PM | Tags: c++17

A new the latest book by Nicolai M. Josuttis is now complete and available.

C++17 - The Complete Guide

by Nicolai M. Josuttis

About the book:

The book is a full description of all language and library features that were introduced and modified with C++17.

It contains plenty of examples and many hints from using these new features in practice.

It is availble at your local book store or here.

 

 

Highlighting the Student and Support Tickets for Meeting C++ 2019

By Meeting C++ | Sep 9, 2019 12:48 AM | Tags: meetingcpp efficiency conference community basics advanced

Also available in this year: the programs for students and diversity & support for Meeting C++ 2019

Highlighting the Student and Support Tickets for Meeting C++ 2019

by Jens Weller

From the article:

With the Schedule for Meeting C++ 2019 being complete regarding submitted talks, I want to highlight, that there is an opportunity for folks to attend the conference with a free ticket!

CppCon 2018: Modern C++ Design--Titus Winters

By Adrien Hamelin | Sep 6, 2019 11:04 AM | Tags: community

We’re in the final countdown to this year’s CppCon, which starts on September 16. To whet your appetite for this year’s conference, here’s another of the top-rated talks from last year. Enjoy – and register today for CppCon 2019!

Modern C++ Design (part 1 of 2)

Modern C++ Design (part 2 of 2)

by Titus Winters

Summary of the talk:

The old rules for C++API design are due for an update - we have made ad hoc changes to design principles in the standard library, but haven’t really written down the new ideas. Parameter passing and API design for free functions/member functions is due for a general update, particularly as a result of rvalue-references and reference qualification. How do we pass non-owning references? How do we sink a T? How do we express “maybe move” APIs? When do we want reference-qualified overload sets? What does an rvalue-reference qualified non-overloaded method mean? How do we express call once semantics?

For types, our consistency in producing Regular types has weakened in recent C++ releases with types like unique_ptr (move-only) and string_view (reference semantics). These classes of design that have shown themselves to be valuable, but certainly surprising at first. As we should not continue to extend the set of type designs arbitrarily, this is a good time to look at type design in the modern C++ era and narrow down the set of designs that are generally favored. This talk will focus on modern C++ design from small (choice of passing by value or reference) to large (Regular types, reference types, move-only types, etc). We will also introduce a taxonomy of type properties as a means to discuss known-good type design families.

We will also dive into the discussion of whether Regular design covers all good design, or whether there is more to the story.

Quick Q: Removing item from vector, while in C++11 range 'for' loop?

By Adrien Hamelin | Sep 6, 2019 11:00 AM | Tags: c++11 basics

Quick A: it is not possible

Recently on SO:

Removing item from vector, while in C++11 range 'for' loop?

No, you can't. Range-based for is for when you need to access each element of a container once.

You should use the normal for loop or one of its cousins if you need to modify the container as you go along, access an element more than once, or otherwise iterate in a non-linear fashion through the container.

For example:

auto i = std::begin(inv);

while (i != std::end(inv)) {
    // Do some stuff
    if (blah)
        i = inv.erase(i);
    else
        ++i;
}