June 16-21, Sofia, Bulgaria
September 13-19, Aurora, CO, USA
October 25, Pavia, Italy
November 6-8, Berlin, Germany
November 16-21, Kona, HI, USA
By Adrien Hamelin | Jun 9, 2021 12:06 PM | Tags: c++20
Are you using concepts?
Decent concepts
by Andrzej Krzemieński
From the article:
Last year I published two posts on writing concepts:
- Concept Archetypes,
- Semantic requirements in concepts.
Having had some time to reflect upon these posts, I now realize that the model presented in them is not complete. In this post I want to give a more coherent view of concepts...
By Adrien Hamelin | Jun 9, 2021 11:59 AM | Tags: community
Are you in such an environement?
A list of bad practices commonly seen in industrial projects
by Thomas Lourseyre
From the article:
If you ever worked in a company-size software project (with numerous developers), there is a good chance that the codebase was, at least, pretty messy.
In these days, most industrial C++ developers are not experts. You will often work with developers with a Java or Python background, people who just learnt C++ at school and don’t really care that much about the language and old developers who code in “C with classes” instead of C++.
Having worked on a few industrial projects myself, I realized there are some recurring patterns and bad practices. If you happen to teach your coworkers to avoid these bad practices, you will all take a huge step toward a beautiful codebase and it will be beneficial to you, your coworkers and your project.
Here is a non-exhaustive list of these common bad practices...
By Adrien Hamelin | Jun 7, 2021 12:26 PM | Tags: intermediate
Back to the basics.
Surprise Included: Inheritance and Member Functions of Class Templates
by Rainer Grimm
From the article:
In my last post "Class Templates", I presented the basics about those. Today, I may surprise you with the inheritance of class templates and the instantiation of member functions of class templates...
By Adrien Hamelin | Jun 7, 2021 12:23 PM | Tags: None
Get some ideas of the possibilities.
How to Filter Elements - the Talk and Optimizations
by Bartlomiej Filipek
From the article:
Two weeks ago, 20th May, I had a pleasure to talk about filtering elements on our Cracow C++ User Group online meeting.
Here are the slides and additional comments from the presentation...
By Adrien Hamelin | Jun 7, 2021 12:14 PM | Tags: intermediate
Quick A: the better match is picked, and an error generated if there none.
Recently on SO:
Overload resolution between object, rvalue reference, const reference
As there is only one parameter, the rule is that one of the three viable parameter initializations of that parameter must be a better match than both the other two. When two initializations are compared, either one is better than the other, or neither is better (they are indistinguishable).
Without special rules about direct reference binding, all three initializations mentioned would be indistinguishable (in all three comparisons)...
By Blog Staff | Jun 3, 2021 10:55 AM | Tags: None
Solution just posted:
GotW #102 Solution: Assertions and "UB"
by Herb Sutter
From the article:
Now that we have considered assertions, postconditions, and preconditions in GotWs #97-101, let’s pause and reflect: To what extent does a failed contract imply "UB"... either the Hidden Dragon of Undefined Behavior, or the Crouching Tiger of Unspecified Behavior?
By Andrey Karpov | Jun 1, 2021 07:01 AM | Tags: pvs-studio performance msvc llvm clang
Although the project's preparation took a while, we were satisfied that the analyzer's performance grew by over 10%. We will use Clang to build future releases of PVS-Studio for Windows.
PVS-Studio Team: Switching to Clang Improved PVS-Studio C++ Analyzer's Performance
by Alexey Govorov and Sergey Larin
From the article:
From the earliest days, we used MSVC to compile the PVS-Studio C++ analyzer for Windows - then, in 2006, known as Viva64, version 1.00. With new releases, the analyzer's C++ core learned to work on Linux and macOS, and we modified the project's structure to support CMake. However, we kept using the MSVC compiler to build the analyzer's version for Windows. Then, in 2019, on April 29th, Visual Studio developers announced they had included the LLVM utilities and Clang compiler in the IDE.
By Adrien Hamelin | May 31, 2021 02:36 PM | Tags: intermediate
How do you do it?
How to Insert Several Elements in a Vector (With No Memory Errors)
by Jonathan Boccara
From the article:
Inserting elements in a vector sounds like the most basic use case we can think of when it comes to using collections in C++.
Nevertheless, this is a complex topic in itself, because std::vector offers various ways to insert several elements. Choosing the most appropriate depending on your exact use case allows to write more expressive code. And misusing the interface of std::vector can lead to memory errors.
Let’s navigate the various ways to insert several elements in a vector in a safe way, so that you can choose the one that fits best for your code...
By Adrien Hamelin | May 31, 2021 02:30 PM | Tags: performance
The evolution.
Compile-time pre-calculations in C++
by Mohammad Nasirifar
From the article:
With C++17’s constexpr functions and C++20’s consteval specifier, it is easy to do io-independent pre-calculations of algorithms while compiling the program. This may not be useful or even possible in long running programs and is unlikely to make a difference in their performance, but in binaries that do short calculations with a set of parameters fixed at compile-time, a Sieve of Eratosthenes array, or roots of unity used for calculating DFT loaded right from the binary could make a difference...
By Adrien Hamelin | May 31, 2021 02:23 PM | Tags: community
Did you know about those reasons?
East End Functions
by Phil Nash
From the article:
There has been a recent stirring of attention, in the C++ community, for the practice of always placing the const modifier to the right of the thing it modifies. The practice has even been gifted a catchy name: East Const (which, I think, is what has stirred up the interest)...