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Generators and the Sweet Syntactic Sugar of Coroutines--Adi Shavit

By Adrien Hamelin | Dec 11, 2019 12:32 PM | Tags: experimental advanced

A very detailed and interesting article, a must read!

Generators and the Sweet Syntactic Sugar of Coroutines

by Adi Shavit

From the article:

“Coroutines make it trivial to define your own ranges.”
— Eric Niebler, Lead author of the C++ Ranges proposal (edited for drama)

Hmmm… is that so?
But wait, what are coroutines?

From Boost.Coroutine2: A coroutine (coined by Melvin Conway in 1958!) is a function that can suspend execution to be resumed later. It allows suspending and resuming execution at certain locations and preserves the local state of execution and allows re-entering the subroutine more than once. In contrast to threads, which are pre-emptive, coroutine switches are cooperative: the programmer controls when a switch will happen. The kernel is not involved in the coroutine switches.

This sounds just like what we want!

Don’t Make Your Interfaces *Deceptively* Simple--Jonathan Boccara

By Adrien Hamelin | Dec 11, 2019 12:26 PM | Tags: intermediate

A good thing to think about.

Don’t Make Your Interfaces *Deceptively* Simple

by Jonathan Boccara

From the article:

Just because we can provide an interface doesn’t mean that we should.

At least this is one of the takeaways that I got from from Howard Hinnant’s opening keynote at Meeting C++ 2019.

In this impressive keynote, Howard made a presentation about <chrono> and the host of features it brings in C++20. But beyond showing us how to use <chrono>, Howard explained some of the design rationale of this library.

Those are precious lessons of design, especially coming from someone who had a substantial impact on the design of the standard library. I believe we can apply those practices to our own code when designing interfaces.

So, just because we can provide an interface doesn’t mean that we should. To illustrate what this means in practice, let’s go over two examples in the C++ standard library...

C++ coroutines: Getting started with awaitable objects--Raymond Chen

By Adrien Hamelin | Dec 9, 2019 02:01 PM | Tags: experimental

So many possibilities!

C++ coroutines: Getting started with awaitable objects

by Raymond Chen

From the article:

Coroutines were added to C++20, and Lewis Baker has a nice introduction to them.

  • Coroutine theory.
  • Understanding operator co_await.
  • Understanding the promise type.

But I’m going to write another one, taking a more practical approach: The least you need to know to accomplish various coroutine tasks...

C++20: Concepts, the Details--Rainer Grimm

By Adrien Hamelin | Dec 4, 2019 11:57 AM | Tags: experimental

The series continue.

C++20: Concepts, the Details

by Rainer Grimm

From the article:

In my last post C++20: Two Extremes and the Rescue with Concepts, I gave the first motivation for concepts. Concepts put semantic constraints on template parameters. Today, I present different use-cases for concepts in a compact form...

Named Template Arguments--Barry Revzin

By Adrien Hamelin | Dec 4, 2019 11:15 AM | Tags: experimental

It's coming!

Named Template Arguments

by Barry Revzin

From the article:

C++, unlike many other programming languages, doesn’t have named function parameters or named function arguments. I hope it will someday, it’s a language feature that I find has large benefits for readability. Until then, in C++20, we actually have the ability to do a decent approximation not only of named function arguments but also named template arguments...

Meeting C++ 2019 summary--Schneide blog

By Adrien Hamelin | Nov 28, 2019 10:05 AM | Tags: community

Trip report.

Meeting C++ 2019 summary

by Schneide blog

From the article:

A fellow colleague and me had the pleasure to attend this years Meeting C++ 2019 from November 14th-16th in Berlin. It was my second visit and a quite interesting and insightful one. Therefore I would like to give a short summary and share some of my take-aways...