std::span in C++20: Bounds-Safe Views for Sequences of Objects

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.

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Views: 7556

volatile and Other Small Improvements in C++20

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.

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Views: 8238

New Attributes with C++20

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.

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Views: 8794

More Lambda Features with C++20

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.

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Tags: lambdas, C++20
Views: 6614

More Powerful Lambdas with C++20

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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Views: 9453

Various Template Improvements with C++20

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.

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Views: 7409

Solving the Static Initialization Order Fiasco with C++20

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++.  

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Views: 11063

Two new Keywords in C++20: consteval and constinit

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.

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Tags: C++20
Views: 29692

Designated Initializers

Designated initialization is an extension of aggregate initialization and empowers you to directly initialize the members of a class type using their names.

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Views: 18962

C++20: Optimized Comparison with the Spaceship Operator

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.

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Views: 5910

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