Thanks to templates, there are new ways of software design. Policies and traits are two commonly used idioms in C++.

I'm happy to announce: The registration for my mentoring program is now open until the 17th of April.

Expression templates are typically used in linear algebra and are  "structures representing a computation at compile-time, which structures are evaluated only as needed to produce efficient code for the entire computation" (https://en.wikipedia.org/wiki/Expression_templates). In other words, expression templates are only evaluated when needed. 

In my previous  post "More about Dynamic and Static Polymorphism", I used the Curiously Recurring Template Pattern (CRTP) to implement static polymorphism. Another typical use case for CRTP are mixins.

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I have prepared my mentoring program and am ready to start on 22nd April.

In my last post "Dynamic and Static Polymorphism", I introduced dynamic polymorphism. Today, I continue with static polymorphism and present are very interesting idiom in C++: curiously recurring template pattern (CRTP).

Do you want to participate in my mentoring program "Fundamentals for C++ Professionals"? Of course, you want to read more about me on my mentoring page: About Rainer Grimm.

Polymorphism is the property that different types support the same interface. In C++, we distinguish between dynamic polymorphism and static polymorphism.

In today's post, I want to introduce a very interesting C++17 feature: constexpr if. constexpr if enables it to conditionally compile source code and can also be used for nice tricks at compile time.