The topic for today is quite important when you create your type: Regular and SemiRegular types.
Let me continue with the rules for defining concepts in the guidelines. In this post, the first of the three remaining rules is quite sophisticated.
Although rule T.11 states: Whenever possible use standard concepts you sometimes have to define your concepts. This post gives you rules to do it.
We will get concepts with high probability in C++20. Here are from the C++ core guidelines the rules to use them.
Concepts revolutionise the way we think about and use generic programming. They didn't make it in C++11, or C++17 but with C++20 we will get them with high probability.
I wrote a few posts about using concepts. Concepts are a named set of requirements. Let's define a few concepts in this post.
The unification of templates, concepts, and placeholders goes on. This time, I will have a closer look at constrained (concepts) and unconstrained (auto) placeholders in the context of templates.
C++11 has with auto unconstrained placeholders. You can use concepts in C++20 as constrained placeholders. What seems at first glimpse not so thrilling is for me the decisive quantum leap. C++ templates will become an easy to use C++ feature.
We stay in the year 2020. With high probability we will get concepts. Of course, waterproof statements about the future are difficult but the statement is from Bjarne Stroustrup (Meeting C++ 2016 at Berlin).
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