13 enum DescriptorState<T> {
15     Allocated(Allocation<T>),
18 impl<T> DescriptorState<T> {
50     fn allocate<T>(self, data: Option<T>) -> Allocation<T> {  in allocate()  argument
58 struct Allocation<T> {
60     data: Option<T>,
63 impl<T> Allocation<T> {
64     fn deallocate(self) -> (Reservation, Option<T>) {  in deallocate()  argument
72     fn take(&mut self) -> Option<T> {  in take()  argument
99 struct Range<T> {
102     state: DescriptorState<T>,
105 impl<T> Range<T> {
111 pub(crate) struct RangeAllocator<T> {
112     inner: Impl<T>,
115 enum Impl<T> {
117     Array(ArrayRangeAllocator<T>),
118     Tree(TreeRangeAllocator<T>),
121 impl<T> RangeAllocator<T> {
153     pub(crate) fn reserve_new(&mut self, mut args: ReserveNewArgs<T>) -> Result<ReserveNew<T>> {  in reserve_new()  argument
245     pub(crate) fn reservation_commit(&mut self, offset: usize, data: &mut Option<T>) -> Result {  in reservation_commit()
256     pub(crate) fn reserve_existing(&mut self, offset: usize) -> Result<(usize, usize, Option<T>)> {  in reserve_existing()  argument
267     pub(crate) fn take_for_each<F: Fn(usize, usize, usize, Option<T>)>(&mut self, callback: F) {  in take_for_each()
278 pub(crate) struct ReserveNewArgs<T> {
283     pub(crate) empty_array_alloc: Option<EmptyArrayAlloc<T>>,
284     pub(crate) new_tree_alloc: Option<FromArrayAllocs<T>>,
285     pub(crate) tree_alloc: Option<ReserveNewTreeAlloc<T>>,
289 pub(crate) enum ReserveNew<T> {
290     Success(ReserveNewSuccess<T>),
291     NeedAlloc(ReserveNewNeedAlloc<T>),
295 pub(crate) struct ReserveNewSuccess<T> {
301     _empty_array_alloc: Option<EmptyArrayAlloc<T>>,
302     _new_tree_alloc: Option<FromArrayAllocs<T>>,
303     _tree_alloc: Option<ReserveNewTreeAlloc<T>>,
308 pub(crate) struct ReserveNewNeedAlloc<T> {
309     args: ReserveNewArgs<T>,
315 impl<T> ReserveNewNeedAlloc<T> {
317     pub(crate) fn make_alloc(mut self) -> Result<ReserveNewArgs<T>> {  in make_alloc()  argument