Typically, you use the overload pattern for a std::variant. std::variant is a type-safe union. A std::variant (C++17) has one value from one of its types. std::visit allows you to apply a visitor to it. Exactly here comes the overload pattern convenient into play.
To complete my post about variadic templates and fold expressions, I present in this post smart tricks using parameter packs and fold expressions.
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In my last two posts, “Variadic Templates or the Power of Three Dots” and “More about Variadic Templates“, I introduced variadic templates. This post goes one step further in the future, and presents fold expressions that can directly reduce a parameter pack with a binary operator.
In the last weeks, I learned something new about modules in C++20: private modules fragments and header units. Consequently, I make a short detour in this post and present these new features.
I’m happy to announce the first big update of my C++20 book. The update was mainly due to the improved C++ compiler support of C++20. The update includes concepts, the ranges library, modules, the three-way comparison operator, the format library, and the chrono library.
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There is a lot of power in the strange-looking three dots that are heavily used in the Standard Template Library. Today, I visualize the expansion of the three dots and show a few use cases.
A variadic template is a template that can have an arbitrary number of template parameters. If you see it for the first time, this feature may seem magical to you. So, let me demystify variadic templates.