C++ User Group meetings in July 2021

by Jens Weller

This month is special as Meeting C++ celebrates 9 years of Meeting C++ on July 8th! Also keep in mind that the call for talks and the early bird tickets for Meeting C++ 2021 end on July 11th!

How To Detect Function Overloads in C++17/20, std::from_chars Example

by Bartlomiej Filipek

In this article, I’ll show you a background “theory” and one case - std::from_chars that exposes full support for numbers or only integer support (in GCC, Clang)...

Template Specialization

by Rainer Grimm

Templates define the behavior of families of classes or functions. Often it is required that special types or non-types may be treated special. To support this use case, you can specialize templates.

C++20 three-way comparison operator: Part 2

by Gajendra Gulgulia

In the first part of the tutorial series, I laid out the motivation behind C++20’s three way comparison operator: <=> and showcased the simplest use case how it can be useful to remove the boilerplate code for comparison operators : ==, >=, <=, !=, >, < if the semantics of the program requires us to implement them and how they can be gotten rid of by using the defaulted version of three way comparison operator...

Template Argument Deduction of Class Templates

by Rainer Grimm

In my last post Template Arguments, I wrote about function template type deduction (C++98) and auto type deduction (C++11). Today I wear more modern hats. I start with automatic type deduction of non-type template parameters and class templates (C++17) and finish with automatic type deduction of concepts (C++20).

C++ 17 Class Templates: CTAD and Type Deduction Guide

by Gajendra Gulgulia

This article aims to demonstrate the CTAD feature and how to force C++ to deduce type specifically for class templates with the explicit type deduction guides available since C++17.

Reversing words of a string with ranges

by Marco Arena

In this post I share the story of a “C++ aha-moment”, hence I use the hashtag #thatsarotate (resumed last Saturday at the Italian C++ Conference 2021 to honor our keynote speaker Sean Parent). Why not sharing your own stories of “C++ aha-moments” adding the same hashtag to your tweets, posts, or whatever? It would be really appreciated...

7 Top Tips for Debugging C++

by Greg Law

Debugging is central to programming – you cannot be a great programmer without being great at debugging. Hopefully, my favorite C++ debugging tips will help you be as clever and productive debugging your code as you are writing it in the first place.

• #1 Have a full kit of debugging tools
• #2 Conditional breakpoints
• #3 Watchpoints
• #4 User-defined debugging commands in Python
• #5 Pretty-print structures
• #6 Time Travel Debugging
• #7 Command find to search for a byte sequence

Transrangers: An Efficient, Composable Design Pattern for Range Processing

by Joaquín M López Muñoz

Transrangers are a new design pattern for efficient, composable range processing that can be faster than pull-based C++/Range-v3 views whithout losing any expressiveness. The underlying architecture combines ideas from push processing with the internalization of control flow. Transrangers can be used on their own or be leveraged as an implementation detail of range libraries to improve the performance of view-based operations.

Painless C++ Coroutines-Part 1

Painless C++ Coroutines-Part 2

Painless C++ Coroutines-Part 3

Painless C++ Coroutines-Part 4

Painless C++ Coroutines-Part 5

by Gajendra Gulgulia

Incidentally I found the mechanics of coroutines quite obfuscating given the number of implicit and under-the-hood calls to several methods associated with coroutine and their return type objects. Even with tons of articles and posts on the web, I started to have a feeling that coroutines is an arcane feature that can be understood by the very few who are either in committee or are renowned authors of blogs, books and articles or experienced C++ library authors.
But after a month of arduous efforts and experiments, trials and errors to understand coroutine, I decided to write a tutorial series that can be used by any intermediate C++ developer to understand coroutine and in the effort I made sure that this article is the last that anyone should refer to, to learn, understand and demystify coroutines without being a super experienced C++ library author. If you’re impatient to get started, then directly jump to section 1: What are coroutines? Else read the Introduction section to get detailed highlight of the tutorial series...