[whatidonteven]

I used boost extensively in the past (2006-2011). But I have been disillusioned by all the accidental complexity. It's easy to use the complicated parts of boost, but you lose sight of the inefficiencies you introduce all over the place, be it code bloat, unnecessary indirections, splitting up of allocations, or merely bloating your build times.

Besides, std::unordered_map is flawed, the bucket interface forces suboptimal cache behavior. std::thread is such a thin abstraction, if you use C++ you might as well use it but it doesn't buy you much. same with std::mutex. std::regex on the other hand I avoid because it's easy to write "regular" expressions that cause backtracking with it. I would look at something like re2 instead, if I had to deal with text parsing a lot. or a proper LALR parser generator if the language is not regular.