Probably the most viral keyword in modern C++ is constexpr. With C++20, we have a constexpr std::vector and a constexpr std::string. Additionally, both containers can be manipulated with the constexpr algorithms of the Standard Template Library.
In my seminar, I often hear the question: How can I safely pass a plain array to a function? With C++20, the answer is quite easy: Use a std::span.
Last week, I launched a quiz. The price was it to win one of the five vouchers for the book "Modern C++ for Absolute Beginners" from Slobodan Dmitrović.
Is it possible to introduce C++ in 300 pages? Yes, it is. The book "Modern C++ for Absolute Beginners" from Slobodan Dmitrović proves it.
Today, I complete my tour through the C++20 core language features with a few small improvements. One interesting of these minor improvements is that most of volatile has been deprecated.
With C++20, we got new and improved attributes such as [[nodiscard("reason")]], [[likely]], [[unlikely]], and [[no_unique_address]]. In particular, [[nodiscard("reason")]] allows it to express the intention of your interface way clearer.
Do you know that PVS-Studio is integrated into the Compiler Explorer? If not, you should definitely read this guest post from Andrey Karpov including a promo code.
Lambdas in C++20 can be default-constructed and support copy-assignment when they have no state. Lambdas can be used in unevaluated contexts. Additionally, they detect when you implicitly copy the this pointer. This means a significant cause of undefined-behavior with lambdas is gone.
Just updated: The C++ Standard Library: What every professional C++ programmer should know about the C++ standard library.
Thanks to C++20, lambdas become more powerful. From the various lambda improvements, template parameters for lambdas are my favorite ones.
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