pub struct OptionRegion<R> { /* private fields */ }
Expand description
A region to hold Option
s.
§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§
Source§impl<R> Clone for OptionRegion<R>where
R: Clone,
impl<R> Clone for OptionRegion<R>where
R: Clone,
Source§fn clone(&self) -> OptionRegion<R>
fn clone(&self) -> OptionRegion<R>
Returns a copy of the value. Read more
Source§fn clone_from(&mut self, source: &OptionRegion<R>)
fn clone_from(&mut self, source: &OptionRegion<R>)
Performs copy-assignment from
source
. Read moreSource§impl<R> Debug for OptionRegion<R>where
R: Debug,
impl<R> Debug for OptionRegion<R>where
R: Debug,
Source§impl<R> Default for OptionRegion<R>where
R: Default,
impl<R> Default for OptionRegion<R>where
R: Default,
Source§fn default() -> OptionRegion<R>
fn default() -> OptionRegion<R>
Returns the “default value” for a type. Read more
Source§impl<'de, R> Deserialize<'de> for OptionRegion<R>where
R: Deserialize<'de>,
impl<'de, R> Deserialize<'de> for OptionRegion<R>where
R: Deserialize<'de>,
Source§fn deserialize<__D>(
__deserializer: __D,
) -> Result<OptionRegion<R>, <__D as Deserializer<'de>>::Error>where
__D: Deserializer<'de>,
fn deserialize<__D>(
__deserializer: __D,
) -> Result<OptionRegion<R>, <__D as Deserializer<'de>>::Error>where
__D: Deserializer<'de>,
Deserialize this value from the given Serde deserializer. Read more
Source§impl<'a, T, TR> Push<&'a Option<T>> for OptionRegion<TR>
impl<'a, T, TR> Push<&'a Option<T>> for OptionRegion<TR>
Source§impl<T, TR> Push<Option<T>> for OptionRegion<TR>
impl<T, TR> Push<Option<T>> for OptionRegion<TR>
Source§impl<R> Region for OptionRegion<R>where
R: Region,
impl<R> Region for OptionRegion<R>where
R: Region,
Source§type Owned = Option<<R as Region>::Owned>
type Owned = Option<<R as Region>::Owned>
An owned type that can be constructed from a read item.
Source§type ReadItem<'a> = Option<<R as Region>::ReadItem<'a>>
where
OptionRegion<R>: 'a
type ReadItem<'a> = Option<<R as Region>::ReadItem<'a>> where OptionRegion<R>: 'a
The type of the data that one gets out of the container.
Source§type Index = Option<<R as Region>::Index>
type Index = Option<<R as Region>::Index>
The type to index into the container. Should be treated
as an opaque type, even if known.
Source§fn merge_regions<'a>(
regions: impl Iterator<Item = &'a OptionRegion<R>> + Clone,
) -> OptionRegion<R>where
OptionRegion<R>: 'a,
fn merge_regions<'a>(
regions: impl Iterator<Item = &'a OptionRegion<R>> + Clone,
) -> OptionRegion<R>where
OptionRegion<R>: 'a,
Construct a region that can absorb the contents of
regions
in the future.Source§fn index(
&self,
index: <OptionRegion<R> as Region>::Index,
) -> <OptionRegion<R> as Region>::ReadItem<'_>
fn index( &self, index: <OptionRegion<R> as Region>::Index, ) -> <OptionRegion<R> as Region>::ReadItem<'_>
Index into the container. The index must be obtained by
pushing data into the container.
Source§fn reserve_regions<'a, I>(&mut self, regions: I)
fn reserve_regions<'a, I>(&mut self, regions: I)
Ensure that the region can absorb the items of
regions
without reallocationSource§fn reborrow<'b, 'a>(
item: <OptionRegion<R> as Region>::ReadItem<'a>,
) -> <OptionRegion<R> as Region>::ReadItem<'b>where
'a: 'b,
OptionRegion<R>: 'a,
fn reborrow<'b, 'a>(
item: <OptionRegion<R> as Region>::ReadItem<'a>,
) -> <OptionRegion<R> as Region>::ReadItem<'b>where
'a: 'b,
OptionRegion<R>: 'a,
Converts a read item into one with a narrower lifetime.
Source§impl<'a, T, TR> ReserveItems<&'a Option<T>> for OptionRegion<TR>
impl<'a, T, TR> ReserveItems<&'a Option<T>> for OptionRegion<TR>
Source§impl<T, TR> ReserveItems<Option<T>> for OptionRegion<TR>where
TR: Region + ReserveItems<T>,
impl<T, TR> ReserveItems<Option<T>> for OptionRegion<TR>where
TR: Region + ReserveItems<T>,
Source§impl<R> Serialize for OptionRegion<R>where
R: Serialize,
impl<R> Serialize for OptionRegion<R>where
R: Serialize,
Source§fn serialize<__S>(
&self,
__serializer: __S,
) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>where
__S: Serializer,
fn serialize<__S>(
&self,
__serializer: __S,
) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>where
__S: Serializer,
Serialize this value into the given Serde serializer. Read more
Auto Trait Implementations§
impl<R> Freeze for OptionRegion<R>where
R: Freeze,
impl<R> RefUnwindSafe for OptionRegion<R>where
R: RefUnwindSafe,
impl<R> Send for OptionRegion<R>where
R: Send,
impl<R> Sync for OptionRegion<R>where
R: Sync,
impl<R> Unpin for OptionRegion<R>where
R: Unpin,
impl<R> UnwindSafe for OptionRegion<R>where
R: UnwindSafe,
Blanket Implementations§
Source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
Source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
Source§impl<T> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
Source§unsafe fn clone_to_uninit(&self, dst: *mut T)
unsafe fn clone_to_uninit(&self, dst: *mut T)
🔬This is a nightly-only experimental API. (
clone_to_uninit
)