[scottlamb]

> It's not great to have to double your memory usage while you reallocate your array. On more limited devices (see games consoles or mobile devices) you'll end up fragmenting your memory pretty quickly if you do that too often and the next time you try to increase your array you may not have a contiguous enough block to allocate the larger array.

That doesn't smell right to me, assuming you're talking about userspace applications on newer hardware. aarch64 supports at least 39-bit virtual addresses [1] and x86-64 supports at least 48-bit virtual addresses [2]. Have you actually had allocations fail on these systems due to virtual address space fragmentation?

Certainly this is something to consider when dealing with low-RAM devices with no MMU or on 32-bit, but the former hasn't applied to the device categories you mentioned in probably 20 years, and in 2021 the latter is at least the exception rather than the rule.

[1] https://www.kernel.org/doc/html/v5.8/arm64/memory.html

[2] https://en.wikipedia.org/wiki/X86-64#Virtual_address_space_d...