What do number conversions cost?

by Jens Weller

And so the devil said: "what if there is an easier design AND implementation?"

In the last two blog posts I've been exploring some of the ways to implement a certain type that has a string_view and holds a conversion to a type in a variant or any. And my last blog post touched on conversions. And that made me wonder, what if I did not have a cache in the type for conversions? The memory foot print would be much smaller, and implementation could be simple to convert in a toType function on demand. This then would essentially be a type that holds a string_view, but offers ways to convert this view to a type. Adding a cache to hold the converted value is in this case not necessary, as this is done on demand.

Modern C++ In-Depth — Literal Operators and User-Defined Literals

by Michael Kristofik

In this installment, we’re going to take a look at user-defined literals. First introduced in C++11, this feature allows developers to create custom suffixes that can be used to reduce verbosity.

C++20 Formatting Library

by Gajendra Gulgulia

Part 1: Setup and Basics

Part 2: Width, Fill and Alignment

Part 3: Sign Specification

At the time of writing this series, the header format is not yet integrated into latest gcc or clang compiler. According to reference the only two compilers that have so far implemented the standard text formatting libraries are clang-14* and msvc 19.29. Due to limitations in my personal computer, I’ll therefore be using the fmt library on which the standard string formatting library is based. When the compiler support is released, the token fmt::format can be replaced with std::format and the examples in the series should work as it is. ...

Getting Started with Boost.Asio: Timers and Serial Ports

by Richard Thomson

I/O operations are inherently asynchronous -- we don't know when input will arrive and when output will be generated. Network I/O can be particularly bothersome because of the long delays between sending a request and obtaining the response.

Boost.Asio is a cross-platform C++ library for network and low-level I/O programming that provides developers with a consistent asynchronous model using a modern C++ approach. Boost.Asio covers timers, serial ports, files, pipes and TCP/IP networking.

This month, Richard Thomson will give us an introduction to Boost.Asio concepts and asynchronous programming with this library. We'll look at how to use timers to notify our application of time passing and how to talk to serial ports asynchronously.

https://www.youtube.com/watch?v=XB3uEit5R_Y

Effortless Performance Improvements in C++: std::vector

by Julien Jorge

This is the third post in the series about effortless performance improvements in C++. Check the first post to get the full story!

Last time we switched from std::map to std::unordered_map and got 30% performance improvements. After these changes we observed that the tokenize function was a top hotspot, mostly due to std::vector::push_back. How can we improve the performance of this function? ...

Meeting C++ online job fair page

by Jens Weller

Join the online C++ job fair on the 14th and 15th March organized by Meeting C++. The job fair will start at 15:00 CET and go until 18:00 on March 14th, on March 15th the event will be in the evening from 20 - 23:00 CET. Companies can choose to be present on both or only one of these events, or to only receive CVs through Meeting C++.

The job fair is an online event where employers and C++ job seekers get to meet each other. Candidates get the chance to get a first feel of a potential employer, and can exchange contacts with those that they'd like to apply to. Employers should book their own table and be present with one or multiple staff.

Merging intervals in next-gen C++

by Marco Arena

A few weeks ago, I set this problem at Coding Gym: given an array of intervals where intervals[i] = [starti, endi], merge all overlapping intervals, and return an array of the non-overlapping intervals that cover all the intervals in the input...

Effortless Performance Improvements in C++

Part 1: Analyzing a program

Part 2: std::unordered_map

by Julien Jorge

In this series of blog posts we are going to explore the implications on processing time for typical C++ way-of-doing by implementing a non-trivial task using idiomatic C++. Then we will benchmark this program and improve its performance.

Optimization is a never-ending quest that can lead to huge sacrifices in terms of code readability. ... In these blog posts we will restrict ourselves into transformations that do not diminish the expressiveness of the existing interfaces, and we will stay withing the scope of the standard library. We will see that even within these limits one can easily reduce processing times by a factor of two, and maybe three with some compromises. ...

Decreasing the Number of Memory Accesses, 1.2

by Johnny's Software Lab

When we are trying to speed up a memory-bound loop, there are several different paths. We could try decreasing the dataset size. We could try increasing available instruction level parallelism. We could try modifying the way we access data. Some of these techniques are very advanced. But sometimes we should start with the basics.

One of the ways to improve on memory boundness of a certain piece of code is the old-fashioned way: decrease the total number of memory accesses (loads or stores). Once a piece of data is in the register, using it is very cheap, to the point of being free (due to CPU’s ability to execute up to 4 instructions in a single cycle and their out-of-order nature). So all techniques that try to lower the total number of loads and stores should result in speedups. ...

Fun with printing tables with std::format and C++20

by Bartlomiej Filipek

Today’s experiment went from a simple table printing code using C++17 into a fancier version from C++20. The improved code was “nicer” and easier to write and maintain. Additionally, we got working date-time handling capabilities in just a couple of lines of code! Which wasn’t possible until C++20. ...