Struct flatcontainer::impls::option::OptionRegion

pub struct OptionRegion<R> { /* private fields */ }

A region to hold Options.

Examples

The region can hold options:

let mut r = <OptionRegion<<u8 as RegionPreference>::Region>>::default();

let some_index = r.push(Some(123));
// Type annotations required for `None`:
let none_index = r.push(Option::<u8>::None);

assert_eq!(Some(123), r.index(some_index));
assert_eq!(None, r.index(none_index));

Trait Implementations

impl<R: Clone> Clone for OptionRegion<R>

fn clone(&self) -> Self

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<R: Debug> Debug for OptionRegion<R>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<R: Default> Default for OptionRegion<R>

fn default() -> OptionRegion<R>

Returns the “default value” for a type.

impl<'de, R> Deserialize<'de> for OptionRegion<R>

where R: Deserialize<'de>,

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<'a, T: 'a, TR> Push<&'a Option<T>> for OptionRegion<TR>

where TR: Region + Push<&'a T>,

fn push(&mut self, item: &'a Option<T>) -> <OptionRegion<TR> as Region>::Index

Push item into self, returning an index that allows to look up the corresponding read item.

impl<T, TR> Push<Option<T>> for OptionRegion<TR>

where TR: Region + Push<T>,

fn push(&mut self, item: Option<T>) -> <OptionRegion<TR> as Region>::Index

Push item into self, returning an index that allows to look up the corresponding read item.

impl<R: Region> Region for OptionRegion<R>

type Owned = Option<<R as Region>::Owned>

An owned type that can be constructed from a read item.

type ReadItem<'a> = Option<<R as Region>::ReadItem<'a>> where Self: 'a

The type of the data that one gets out of the container.

type Index = Option<<R as Region>::Index>

The type to index into the container. Should be treated as an opaque type, even if known.

fn merge_regions<'a>(regions: impl Iterator<Item = &'a Self> + Clone) -> Self

where Self: 'a,

Construct a region that can absorb the contents of regions in the future.

fn index(&self, index: Self::Index) -> Self::ReadItem<'_>

Index into the container. The index must be obtained by pushing data into the container.

fn reserve_regions<'a, I>(&mut self, regions: I)

where Self: 'a, I: Iterator<Item = &'a Self> + Clone,

Ensure that the region can absorb the items of regions without reallocation

fn clear(&mut self)

Remove all elements from this region, but retain allocations if possible.

fn heap_size<F: FnMut(usize, usize)>(&self, callback: F)

Heap size, size - capacity

fn reborrow<'b, 'a: 'b>(item: Self::ReadItem<'a>) -> Self::ReadItem<'b>

where Self: 'a,

Converts a read item into one with a narrower lifetime.

impl<'a, T: 'a, TR> ReserveItems<&'a Option<T>> for OptionRegion<TR>

where TR: Region + ReserveItems<&'a T>,

fn reserve_items<I>(&mut self, items: I)

where I: Iterator<Item = &'a Option<T>> + Clone,

Ensure that the region can absorb items without reallocation.

impl<T, TR> ReserveItems<Option<T>> for OptionRegion<TR>

where TR: Region + ReserveItems<T>,

fn reserve_items<I>(&mut self, items: I)

where I: Iterator<Item = Option<T>> + Clone,

Ensure that the region can absorb items without reallocation.

impl<R> Serialize for OptionRegion<R>

where R: Serialize,

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.