> For example, D will never have a preprocessor. Or over my dead body :-/

Indeed. Compile time evaluation combined with a preprocessor would make for some serious head scratching when it comes to trusting trust.

Thanks a lot for your answer, I have another one, what languages or topics do you follow for inspiration regarding concepts ?

I could spent 500% of my time studying other languages. So I don't, but the D user community isn't shy about doing that for me!

C++ is trying to eliminate the use of preprocessor. they can't get rid of it but you shouldn't use it.

I see revision after revision of Standard C++, and no progress in that direction. I (along with Andrei Alexandrescu and Herb Sutter) made a proposal to add D's static if feature to eliminate the need for #if. It was vehemently rejected.

Stroustrup has been saying that in print since 1993, and it hasn’t happened yet.