C++11 has 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.
In my previous post Recursion, List Manipulation and Lazy Evaluation I wrote about the characteristics of functional programming: The story about lazy evaluation in C++ is short. Sorry to say but I have forgotten templates. The two advanced techniques CRTP and expression templates are based on lazy evaluation.
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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