You're misunderstanding the purpose of an arena allocator: It's only for relatively short-lived objects which are all released at once; there's (typically) no t

You're misunderstanding the purpose of an arena allocator: It's only for relatively short-lived objects which are all released at once; there's (typically) no transfer of objects to a new arena. This isn't as uncommon as it might seem – for example, auxilliary data which is created during the execution of an algorithm, and which isn't needed anymore once the algorithm has finished, or per-frame data in a computer game. > Or maybe you could own more non-problem-solving code [...] You know, sometimes performance is the problem, and code which improves performance does solve that problem.