In my last post, I presented a possible std::advance implementation based on tag dispatching. One of my readers mentioned that I could also implement std::advance based on constexpr if, or concepts. His right. So let's do it.
In today's post, I want to introduce an exciting C++17 feature: constexpr if. constexpr if enables it to compile source code conditionally and can be used for nice tricks at compile time.
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