You don't usually do C++ subsets if you want the full shebang.

I have a "mini-std" headerfile that's about 500 LoC implementing lightweight variants of std::vector, std::function, a stack-local std::function (unsafe as hell and useful as hell to avoid allocations), a shared-ptr, qsort and some other nifty stuff.

That does a lot of things, but even then I use other patterns that brings a lot of bang for the buck without having to go full C (hint: the stack-local function equivalent gets a lot of mileage).