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.
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 behaviour with lambdas is gone.
Thanks to C++20, lambdas become more powerful. From the various lambda improvements, template parameters for lambdas are my favorite ones.
Admittedly, I present in this post a few small improvements to templates and to C++20 in general. Although these improvements may seem not so impressive to you, they make C++20 more consistent and, therefore, less error-prone when you program generic.
According to the FAQ of isocpp.org is the static initialization order fiasco "a subtle way to crash your program". The FAQ continues: The static initialization order problem is a very subtle and commonly misunderstood aspect of C++. ". Today, I write about this very subtle and misunderstood aspect of C++.
With C++20 we get two new keywords: consteval and constinit. consteval produces a function that is executed at compile-time and constinit guarantees that a variable is initialized at compile-time.
Designated initialization is an extension of aggregate initialization and empowers you to directly initialize the members of a class type using their names.
In this post, I conclude my miniseries to the three-way comparison operator with a few subtle details. The subtle details include the compiler-generated the == and != operators and the interplay of classical comparison operators and the three-way comparison operator.
The compiler performs quite a clever job when it generates all six comparison operators. In the end, you get the intuitive and efficient comparison operators for free. Let me dive with this post into the details of the spaceship operator.
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