Design and evolution of constexpr in C++

by Evgeny Shulgin

The authors suffered greatly from the inability to use STL containers and wrote the std::vector and std::map analogues. Inside, these analogues have std::array that can work in constexpr. Proposal [P0784] Standard containers and constexpr studies the possibility of inputting STL containers in constexpr evaluations. Note. It's important to know what an allocator is. STL containers work with memory through it. What kind of an allocator — is specified through the tempte argument. If you want to get into the topic, read this article.

The Interesting Evolution of std::equal_range

by Jonathan Boccara

The good old std::equal_range STL algorithm, which has been in the STL since C++98, has evolved along with the versions of C++.

Starting from a poor interface and now a much better one, its story is an interesting example of how to improve the abstraction of an interface...

Little C++ Standard Library Utility: std::align

by Lesley Lai

Recently, I learned about std::align, which is one of the lesser-known functions in the C++ standard library because of its limited use cases. Since it is hard to describe without a specific use case, I will use a simple implementation of an arena allocator as a motivational example.

C++20 Concepts: Part 5 (Advanced use cases)

by Gajendra Gulgulia

In this article, I’ll explain and demonstrate how to define concepts that constrain multiple template parameters and more importantly how to use them in a generic function. As promised in the part 3 of the series, I’ll explain this using a function comparing for equality of two different types T and U

The Type-Traits Library: Correctness

by Rainer Grimm

The two main goals of the type-traits library are very convincing: correctness and optimization. Today, I write about correctness...

The Evolutions of Lambdas in C++14, C++17 and C++20

by Jonathan Boccara

Lambdas are one of the most popular features of Modern C++. Since their introduction in C++11, they’ve become ubiquitous in C++ code.

But since their appearance in C++11, they have evolved and gained significant features. Some of those features help write more expressive code, and since using lambdas is so common now, it is worth it to spend time learning what we can do with them.

Our goal here is to cover the major evolutions of lambdas, but not all the little details. A comprehensive coverage of lambdas would be more suited for a book than an article. If you want to dig more, I recommend Bartek’s book C++ Lambda Story, that will tell you everything.

The general evolution of lambdas is to give them able the capabilities of function objects manually defined.

This articles assumes you know the basics of lambdas in C++11. Let’s take it from C++14...

C++20 Concepts: part 4

by Gajendra Gulgulia

In this issue of the concepts tutorial, I’ll discuss in detail about abbreviated function template syntax , constraining auto with abbreviated function template syntax , constraining deduced return type, i.e. constraining the auto return type with concepts...

The Type-Traits Library: std::is_base_of

by Rainer Grimm

I finished the last article on the Type-Traits library with the challenge of explaining the std::is_base_of and std::is_convertible functions. Today I'm excited to present the answer from Mr. Helmut Zeisel...

The Type-Traits Library: Type Comparisons

by Rainer Grimm

In my last post "The Type-Traits Library: Type Checks" I introduced type checks at compile time with the type-traits library. Today, I write about type comparisons at compile time...

C++ Reflection TS: A First Look

by Clément Pirelli

In this post, I’ll explain the basic ideas of the specification, how to write a simple generic “enum to string” function and go into a bit more detail with a proof-of-concept serialization function.