You don't need explicit language support to do this -- it's a fairly common practice in videogame development, but we usually usually call it an arena/scratch buffer. Ryan Fleury has a wonderful article where goes at length about different memory management strategies [1].

It's just a static buffer that you can use for temporary allocations, e.g. to return an array of 50 int32's to a parent stack frame you can just allocate `50*sizeof(int32)` bytes on that buffer and return a pointer to the beginning, instead of a heap-allocated `std::vector<int32>`. Every allocation advances the head of the buffer, so you can have multiple allocations alive at the same time.

Every once in a while you need to free the buffer, which just means resetting its head back to the start - in the case of games the beginning of a new frame is a convenient point to do that.

This doesn't solve dynamic memory in general, as it can't be used for long-lived allocations, it just saves you a bunch of temporary heap allocations. It doesn't solve all problems that RAII does either, as RAII is often used for resources other than memory - files, sockets, locks, ...

[1] https://www.rfleury.com/p/untangling-lifetimes-the-arena-all...