Today is the start day of Summer C++ISO meeting, this time in Cologne, Germany! This is the “feature-complete” meeting for C++20. It’s the last time we’ll see some new elements that are merged into the working draft.
Let’s see what’s already in C++20 and let’s have a look at some smaller, but very handy proposals that might get into the standard. This is similar to article that I did for Kona and San Diego Meetings.
The problem: a library function offers several overloads, but depending on the implementation/compiler, some of the overloads are not available. How to check the existence of an overload? And how to provide a safe fallback?
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).
If you have two function overloads foo(): one is taking const std::string& and the other taking bool. Which one of them will be selected when you call foo("hello world"); ?
Let’s see where such a case might bite us and cause troubles?
Last Friday my book got a fresh update! It’s been three months since the previous release, and this time I brought foreword, new book format and some small content changes.
One of a powerful uses of std::variant is to implement State Machines. Some time ago I showed a simple example, but today we have something bigger. In today’s article by Nikolai Wuttke you’ll see how to leverage std::variant and build a space game!
If you have a map of strings, like std::map<std::string, int> m; and you want to find some element by m.find("abc"). Do you have to pay the price and construct a std::string object? Can you optimize it?
Let’s have a look at one feature enabled in C++14 that might help optimize such container access.
You’re writing a document about C++, one feature or some cool programming technique. At one point you think that you have to prove that something works and that’s why you need to quote text from the Standard. How to do it?
Welcome to new C++ Links - most important and useful articles, podcasts and videos that happen between 11th and 17th of May 2019.
In this week you will find links for two interesting resources: one about coroutines and the second about modern C++. You will also find a link describing what is the point of declaration, how to use constexpr for investigating errors and many more!
Welcome to new C++ Links - most important and useful articles, podcasts and videos that happen between 4th and 10th of May 2019.
Today you will find a link to a video that shows how Uniform Container Erasure will simplify erasing elements from containers, link to an introduction to modules, and tutorial how to change boost::filesystem to std::filesystem.
As you may know std::filesystem evolved directly from Boost filesystem library. For a long time, it was available as a Technical Specification and later merged into C++17. Developers who used Boost can ask themselves what the differences between the two libs are. Can the code be easily converted to use std::filesystem? Today’s article is written by Scott Furry who writes about the differences he found when working with the two libs.
Welcome to new C++ Links - most important and useful articles, podcasts and videos that happen between 27th of April 3rd of May 2019.
In this week you will find a little bit of C++ history - how namespaces were introduced in C++ and what design choices they have. You will also find a link to an extremely hard C++ quiz!
No matter how proficient you are, I think, you might still use one of the primary methods of debugging: trace values using printf, TRACE, outputDebugString, etc… and then scan the output while debugging.
Adding information about the line number and the file where the log message comes from is a very efficient method that might save you a lot of time. In this post, I’ll describe one trick that is especially useful in Visual Studio but might also help in other IDE/compilers.
I’ll also show you how modern C++ and C++20 make code nicer.
Last Tuesday, 16th April, I had a pleasure to talk about std::filesystem in our Cracow C++ User Group.
Here are the slides and additional comments.
How would you implement a function that searches for files with a given extension? For example, finding all text files? or *.cpp files? To code that solution you need a way to iterate through directories. Is that possible in C++ out of the box using the standard library? Let’s see some techniques and new elements that C++17 added.