Build your own redis sounds like a good idea, but I found the title confusing as C and C++ are different languages and you're using the old "C/C++" phrasing. I immediately wondered, "well, which is it?"

So I dug into it a bit, and from the introduction I see it's "mostly C with some C++ features". But if you're going to require C++ features/libraries and a C++ compiler, then it's not C. So why not just say it's C++? I guess another way to ask is: what makes it "mostly C"? Is it a market capture decision? Is there some interesting language tradeoff involved?