October 25, Pavia, Italy
November 6-8, Berlin, Germany
November 3-8, Kona, HI, USA
By Giovanni Dicanio | May 11, 2023 11:10 AM | Tags: None
Someone learned about std::string_view, and started replacing instances of std::string const& with string_views in their C++ code base. As a result of that, a subtle bug shows up!
The Case of string_view and the Magic String
by Giovanni Dicanio
From the article:
(...) The code is recompiled and executed. But, unfortunately, now the output has changed! What’s going on here? Where does that “magic string” come from?
By Blog Staff | May 11, 2023 09:42 AM | Tags: None
Every year we run Pure Virtual C++: a free one-day virtual conference for the whole C++ community. Next month we’re doing it again! Sign-up for free to get access to our five live sessions and a host of pre-conference content.
Sign Up for the free Pure Virtual C++ 2023 Conference
by Sy Brand
From the article:
The live event will run June 6th 13:00-16:00 UTC. Videos will be available to stream for free on YouTube after the conference.
The live sessions will be:
- C++ Compiler Errors for Humans with Sy Brand
- Address Sanitizer continue_on_error with Jim Radigan
- Value-Oriented Programming with Tony Van Eerd
- Productive Cross-Platform and Game Development in Visual Studio with Sinem Akinci and David Li
- Build Time Reflection with C++ in Year 2023 with Gabriel Dos Reis
By Blog Staff | May 10, 2023 04:40 PM | Tags: None
In an earlier blog post, I showed that the Go programming language allows you to write generic functions once you have defined an interface.
Defining Interfaces in C++ with ‘Concepts’ (C++20)
by Daniel Lemire
From the article:
Java has a very similar concept under the same name (interface). I gave the following example:
type IntIterable interface { HasNext() bool Next() uint32 Reset() } func Count(i IntIterable) (count int) { count = 0 i.Reset() for i.HasNext() { i.Next() count++ } return }
By Blog Staff | May 8, 2023 08:44 AM | Tags: None
When programming, we often need constant variables that are used within a single function.
Consider Using constexpr Static Function Variables for Performance in C++
by Daniel Lemire
From the article:
When programming, we often need constant variables that are used within a single function. For example, you may want to look up characters from a table. The following function is efficient:
char table(int idx) {
const char array[] = {'z', 'b', 'k', 'd'};
return array[idx];
}
By Blog Staff | May 4, 2023 11:46 AM | Tags: None
The C++ committee had its second hybrid meeting in Issaquah, WA in February, to finalize C++23. This was also the venue where we finished up C++14.
ISO C++ Feb 2023 meeting trip report (core language)
by Jason Merrill
From the article:
The C++ committee had its second hybrid meeting in Issaquah, WA in February, to finalize C++23. This was also the venue where we finished up C++14. I was there in person from Red Hat, while Thomas Rodgers and Jonathan Wakely attended virtually. As usual, I spent most of my time in the Core working group.
The primary goal of the meeting was to finish responding to national body comments on the draft and advance the result for balloting to become C++23, and indeed we did; the week went smoothly from my perspective. We also spent a fair amount of time reviewing papers and issues that were not expected to go into C++23.
Most of the C++23 fixes at this meeting were unremarkable, but a couple are worth mentioning:
CWG2518 clarifies that...
By Blog Staff | May 1, 2023 03:28 PM | Tags: None
A classic, over a decade old and worth making the rounds again:
Functional Programming in C++
by John Carmack
From the article:
My pragmatic summary: A large fraction of the flaws in software development are due to programmers not fully understanding all the possible states their code may execute in. ... No matter what language you work in, programming in a functional style provides benefits. You should do it whenever it is convenient, and you should think hard about the decision when it isn’t convenient.
... C++ doesn’t encourage functional programming, but it doesn’t prevent you from doing it, and you retain the power to drop down and apply SIMD intrinsics to hand laid out data backed by memory mapped files, or whatever other nitty-gritty goodness you find the need for. ...
By Blog Staff | Apr 29, 2023 11:01 AM | Tags: None
The GCC developers are proud to announce a new major GCC release, 13.1.
GCC 13.1 Released
by Richard Biener
From the announcement:
The C frontend got support for several C23 features, the C++ frontend for C++23 features. The C++ standard library experimental support for C++20 and C++23 was enhanced. For the C family of languages you can now use -fstrict-flex-arrays[=level] to control the behavior for the various legacy forms of specifying flexible array members.
By Giovanni Dicanio | Apr 28, 2023 01:11 PM | Tags: None
Have you ever wondered how many options for strings are available in C++? This blog post enumerates some of those:
How Many Strings Does C++ Have?
by Giovanni Dicanio
From the article:
Now, let’s enter – drumroll, please – The Realm of C++! And the fun begins
By Giovanni Dicanio | Apr 28, 2023 01:08 PM | Tags: None
What is the Small String Optimization (SSO)?
Let's discover that in the following blog post:
The C++ Small String Optimization
by Giovanni Dicanio
From the article:
How do “Connie” and “meow” differ from “The Commodore 64 is a great computer”?
In several implementations, [...], the STL string classes are empowered by an interesting optimization: The Small String Optimization (SSO).
By Blog Staff | Apr 27, 2023 09:43 AM | Tags: None
The Model-View-Controller (MVC) is one of the classic architectural patterns from the book "Pattern-Oriented Software Architecture, Volume 1". It addresses interactive applications with a flexible human-machine interface.
Model-View-Controller
by Rainer Grimm
From the article:
The MVC divides the program logic of a user interface into separate components model, view, and controller. The model manages the data and rules of the application. The view represents the data, and the controller interacts with the user.
Purpose
- User interfaces need to be changed frequently
- Different user interfaces must be supported
- The data model is stable
Solution
- The application is divided into the components Model (data model), View (output components), and Controller (input components)
- Multiple output components can use the same data model
