Allow set_len(0) on an empty ThinVec.
#32
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Currently it crashes.
- Add `is_singleton`, and change the test in `set_len` to use it, because it's more precise than testing for zero capacity. (Precise in the sense of protecting against the bad case of writing to static memory.) - Remove several "Don't mutate the empty singleton!" checks before `set_len` calls, now that `set_len` is able to handle that itself. - Add a private `set_len_non_singleton`, and use it in places where we know we're not dealing with the singleton (e.g. after calling `reserve(1)`), for ultra-efficiency.
Gankra
approved these changes
Aug 18, 2022
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Currently it crashes.