The ranges library in C++20 made due to performance reasons a few unique design choices. These choices have consequences: cache issues and constness issues. Here is a short reminder. In my last post, “The Ranges Libray in C++20: Design Choices“, I presented this possible implementation of std::ranges::filter_view: if constexpr (!ranges::forward_range<V>) return /* iterator */{*this, ranges::find_if(base_, […]
Thanks to the ranges library, working with the Standard Template Library (STL) is much more comfortable and powerful. First of all, the algorithms of the ranges library are lazy, can work directly on the container, and can be composed. Additionally, the ranges library made a few unique design choices, you must know. Before I dive […]
I am sorry to inform you that I have ALS, a very serious progressive nerve condition. Therefore, I am unsure how long I can continue this blog. Currently, I can only travel to trainings or conferences with the help of my wife. We (my family and I) have decided to deal aggressively with this challenge. […]
In my last post, “C++20: Module Support of the Big Three“, I compiled a simple module with the Big Three. Today, I drill deeper using the GCC, Clang, and Microsoft Compiler. Honestly, this post will be pretty technical and end with a curious note. Additionally, it requires basic modules knowledge. If you don’t have it, […]
I have written almost 100 posts about C++20 in the last four years, but I’m not done. This post continues my story about C++20. Modules are one of the Big Four in C++20. In my C++20 classes, they are one of the main topics. Sadly, the implementation in GCC and Clang was way behind the […]
Thanks to polymorphic allocators in C++17, you can optimize your memory allocation. This optimization includes performance and the reuse of memory. Performance The following program is from cppreference.com/monotonic_buffer_resource. I will explain and extend its performance test to Clang and the MSVC compiler. // pmrPerformance.cpp // https://en.cppreference.com/w/cpp/memory/monotonic_buffer_resource #include <array> #include <chrono> #include <cstddef> #include <iomanip> #include […]
I introduced in my last post “Polymorphic Allocators with C++17” the theory of polymorphic allocators in C++17. Today, I will apply the theory. Before I go on, here are the essential parts of my last post: “Polymorphic Allocators with C++17“. A Short Reminder The following program uses polymorphic allocators. // polymorphicAllocator.cpp #include <array> #include <cstddef> […]
This post starts a miniseries about an almost unknown feature in C++17: polymorphic allocators. I often promised that I would write about polymorphic allocators. Today, I fulfill my promise. Since C++98, you can fine-tune memory allocation in general but also for user-defined types or containers of the standard library. For example, the containers of the […]
C++20 does not provide concrete coroutines, but C++20 provides a framework for implementing coroutines. This changes with C++23. std::generator is the first concrete coroutine. std::generator is part of the extension of the ranges library in C++23. So, let me start this post with the ranges library in C++20 and its extension in C++23. I will […]
I have given many C++20 classes in the last two years and improved my C++20 knowledge. Consequentially, I updated my C++20 book. This update includes restructured chapters, more detailed information, and additional examples. The book now has almost 700 pages and more than 200 examples. This issue is the final one. I’m done and will […]