Overload 155 is now available

By Adrien Hamelin | Feb 18, 2020 01:03 PM | Tags: community

ACCU’s Overload journal of February 2020 is out. It contains the following C++ related articles.

Overload 155 is now available

From the journal:

Members and Remembrances.
Remembering things can be difficult. Frances Buontempo reminisces on routes to erudition.

A line-to-line conversion from Node.js to Node.cpp.
Dmytro Ivanchykhin, Sergey Ignatchenko and Maxim Blashchuk show how we can get a 5x improvement in speed.

The Path of Least Resistance.
Python’s modules and imports can be overwhelming. Steve Love attempts to de-mystify the process.

Quick Modular Calculations(Part 2).
The minverse algorithm previously seen is fast but has limitations. Cassio Neri presents two alternatives.

A Secure Environment for Running Apps?.
Getting apps from the app store is easy. Alan Griffiths considers this from a security perspective.

Afterwood.
The centre half is more than a sporting term. Chris Oldwood shows us why.

Zero, one, two, Freddy's coming for you

By Andrey Karpov | Feb 14, 2020 05:22 AM | Tags: typos quality copy-paste code review bugs

The article might be of interest for authors of books, articles, and C++ coding standards. Based on the given material, you can discuss questions of C++ code quality and ways how to reduce the likelihood of errors' occurence.

Zero, one, two, Freddy's coming for you

by Andrey Karpov

From the article:

This post continues the series of articles, which can well be called «horrors for developers». This time it will also touch upon a typical pattern of typos related to the usage of numbers 0, 1, 2. The language you're writing in doesn't really matter: it can be C, C++, C#, or Java. If you're using constants 0, 1, 2 or variables' names contain these numbers, most likely, Freddie will come to visit you at night. Go on, read and don't say we didn't warn you.

Reverse For Loops in C++--Carlos Buchart

By Adrien Hamelin | Feb 12, 2020 02:59 PM | Tags: basics

How do you do it?

Reverse For Loops in C++

by Carlos Buchart

From the article:

As we saw when working on dynamic bitsets, it can be useful to traverse a collection backwards, from its last element to its first one.

It would be nice to be able to use C++11 range for loops to iterate backwards. But unfortunately, there is no such reverse range-for: range-for only works forwards.

Let’s see how to traverse a collection backwards by using a range for loop...

Five Awesome C++ Papers for the Prague ISO Meeting and C++20 Status--Bartlomiej Filipek

By Adrien Hamelin | Feb 12, 2020 02:57 PM | Tags: community

Did you know them?

Five Awesome C++ Papers for the Prague ISO Meeting and C++20 Status

by Bartlomiej Filipek

From the article:

Continuing the tradition for other ISO C++ Meetings, I prepared a blog post where you’ll learn about:

• The current status of C++20
• an overview about the Prague ISO C++ Meeting (10th till 15th February 2020)
• a few interesting papers that are worth reading

Let’s start!

Concepts in C++20: An Evolution or a Revolution?--Rainer Grimm

By Adrien Hamelin | Feb 12, 2020 02:53 PM | Tags: c++20

What do you think?

Concepts in C++20: An Evolution or a Revolution?

by Rainer Grimm

From the article:

Let me conclude my series to concepts with this meta-post. Are concepts an evolution or a revolution in C++? The answer to this question bothered me quite a time...

Quick Q: Setting a vector equal to {}

By Adrien Hamelin | Feb 11, 2020 12:40 PM | Tags: basics

Quick A: It is possible.

Recently on SO:

Setting a vector equal to {};

It's valid (since C++11). std::vector has an overloaded operator= taking std::initializer_list.

Various Ways of Applying a Function to the Elements of a Collection in C++--Jonathan Boccara

By Adrien Hamelin | Feb 11, 2020 12:35 PM | Tags: intermediate

How do you do it?

Various Ways of Applying a Function to the Elements of a Collection in C++

by Jonathan Boccara

From the article:

Applying a function to each element of a collection of object is a basic use case of manipulating collections, in C++ or anywhere else for that matter...

C++20: Define the Concept Regular and SemiRegular--Rainer Grimm

By Adrien Hamelin | Feb 11, 2020 12:31 PM | Tags: c++20

Concepts continued.

C++20: Define the Concept Regular and SemiRegular

by Rainer Grimm

From the article:

When you want to define a concrete type that works well in the C++ ecosystem, you should define a type that "behaves link an int". Formally, your concrete type should be a regular type. In this post, I define the concepts Regular and SemiRegular...

A Universal I/O Abstraction for C++ -- Corentin Jabot

By Corentin Jabot | Feb 7, 2020 11:45 AM | Tags: c++23

SG-11, the study group charged of all things concurrency and parallelism made forward progress and sent the proposal to LEWG - with the hope of landing a future revision in the C++23 draft. This is rather big news given that this work has been brewing for about a decade.

A Universal I/O Abstraction for C++

by Corentin Jabot

From the article:

The year is 2020 and even consummer CPUs feature double digits number of cores, storage offers 10GB/s read speeds and networks have to accommodate ever-growing traffic.

For a long time, the C++ committee seemed to think that either async file I/O didn’t make sense or was fundamentally irreconcilable with networking. This belief would lead to two inter-incompatible APIs in the standard, which would be a nightmare in term of usability (aka ASIO and AFIO).

It seems that there is finally a way to resolve these divides:

io_uring offers very high performance I/O which doesn’t discriminate on device type.
Sender Receiver provides the composable, low-cost, non-allocating abstraction while offering a simple mental model for asynchronous operations lifetime.
Coroutines make asynchronous i/o dead simple for the 99% use case.
Asynchronous Networking is nice.

Asynchronous I/O is better.

AWAIT ALL THE THINGS!

C++20 Concepts--omnigoat

By Adrien Hamelin | Feb 4, 2020 02:29 PM | Tags: c++20

Getting familiar with concepts.

C++20 Concepts

by omnigoat

From the article:

A quick syntax-based overview of C++20 Concepts, as they are in the standard (circa January 2020)...