pub struct MaybeUnknownLengthCompound<'a, W, C> where
W: 'a,
C: 'a, { /* private fields */ }
Expand description
Contains a Serializer
for encoding elements of sequences and maps.
Note
If , for example, a field inside a struct is tagged with #serde(flatten)
the total number of
fields of this struct will be unknown to serde because flattened fields may have name clashes
and then will be overwritten. So, serde wants to serialize the struct as a map with an unknown
length.
For the described case a UnknownLengthCompound
is used to encode the elements. On end()
the counted length and the encoded elements will be written to the Serializer
. A caveat is,
that structs that contain flattened fields arem always written as a map, even when compact
representaion is desired.
Otherwise, if the length is known, the elements will be encoded directly by the Serializer
.
Trait Implementations
impl<'a, W, C> Debug for MaybeUnknownLengthCompound<'a, W, C> where
W: 'a + Debug,
C: 'a + Debug,
impl<'a, W, C> Debug for MaybeUnknownLengthCompound<'a, W, C> where
W: 'a + Debug,
C: 'a + Debug,
impl<'a, W, C> SerializeMap for MaybeUnknownLengthCompound<'a, W, C> where
W: 'a + Write,
C: SerializerConfig,
impl<'a, W, C> SerializeMap for MaybeUnknownLengthCompound<'a, W, C> where
W: 'a + Write,
C: SerializerConfig,
fn serialize_key<T>(
&mut self,
key: &T
) -> Result<(), <MaybeUnknownLengthCompound<'a, W, C> as SerializeMap>::Error> where
T: Serialize + ?Sized,
fn serialize_key<T>(
&mut self,
key: &T
) -> Result<(), <MaybeUnknownLengthCompound<'a, W, C> as SerializeMap>::Error> where
T: Serialize + ?Sized,
Serialize a map key. Read more
fn serialize_value<T>(
&mut self,
value: &T
) -> Result<(), <MaybeUnknownLengthCompound<'a, W, C> as SerializeMap>::Error> where
T: Serialize + ?Sized,
fn serialize_value<T>(
&mut self,
value: &T
) -> Result<(), <MaybeUnknownLengthCompound<'a, W, C> as SerializeMap>::Error> where
T: Serialize + ?Sized,
Serialize a map value. Read more
fn end(
self
) -> Result<<MaybeUnknownLengthCompound<'a, W, C> as SerializeMap>::Ok, <MaybeUnknownLengthCompound<'a, W, C> as SerializeMap>::Error>
fn end(
self
) -> Result<<MaybeUnknownLengthCompound<'a, W, C> as SerializeMap>::Ok, <MaybeUnknownLengthCompound<'a, W, C> as SerializeMap>::Error>
Finish serializing a map.
impl<'a, W, C> SerializeSeq for MaybeUnknownLengthCompound<'a, W, C> where
W: 'a + Write,
C: SerializerConfig,
impl<'a, W, C> SerializeSeq for MaybeUnknownLengthCompound<'a, W, C> where
W: 'a + Write,
C: SerializerConfig,
fn serialize_element<T>(
&mut self,
value: &T
) -> Result<(), <MaybeUnknownLengthCompound<'a, W, C> as SerializeSeq>::Error> where
T: Serialize + ?Sized,
fn serialize_element<T>(
&mut self,
value: &T
) -> Result<(), <MaybeUnknownLengthCompound<'a, W, C> as SerializeSeq>::Error> where
T: Serialize + ?Sized,
Serialize a sequence element.
fn end(
self
) -> Result<<MaybeUnknownLengthCompound<'a, W, C> as SerializeSeq>::Ok, <MaybeUnknownLengthCompound<'a, W, C> as SerializeSeq>::Error>
fn end(
self
) -> Result<<MaybeUnknownLengthCompound<'a, W, C> as SerializeSeq>::Ok, <MaybeUnknownLengthCompound<'a, W, C> as SerializeSeq>::Error>
Finish serializing a sequence.
Auto Trait Implementations
impl<'a, W, C> RefUnwindSafe for MaybeUnknownLengthCompound<'a, W, C> where
C: RefUnwindSafe,
W: RefUnwindSafe,
impl<'a, W, C> Send for MaybeUnknownLengthCompound<'a, W, C> where
C: Send,
W: Send,
impl<'a, W, C> Sync for MaybeUnknownLengthCompound<'a, W, C> where
C: Sync,
W: Sync,
impl<'a, W, C> Unpin for MaybeUnknownLengthCompound<'a, W, C> where
C: Unpin,
impl<'a, W, C> !UnwindSafe for MaybeUnknownLengthCompound<'a, W, C>
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
sourceimpl<T> Downcast for T where
T: Any,
impl<T> Downcast for T where
T: Any,
sourcefn into_any(self: Box<T, Global>) -> Box<dyn Any + 'static, Global>ⓘNotable traits for Box<W, Global>impl<W> Write for Box<W, Global> where
W: Write + ?Sized, impl<R> Read for Box<R, Global> where
R: Read + ?Sized, impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;
fn into_any(self: Box<T, Global>) -> Box<dyn Any + 'static, Global>ⓘNotable traits for Box<W, Global>impl<W> Write for Box<W, Global> where
W: Write + ?Sized, impl<R> Read for Box<R, Global> where
R: Read + ?Sized, impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;
W: Write + ?Sized, impl<R> Read for Box<R, Global> where
R: Read + ?Sized, impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;
Convert Box<dyn Trait>
(where Trait: Downcast
) to Box<dyn Any>
. Box<dyn Any>
can
then be further downcast
into Box<ConcreteType>
where ConcreteType
implements Trait
. Read more
sourcefn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>
fn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>
Convert Rc<Trait>
(where Trait: Downcast
) to Rc<Any>
. Rc<Any>
can then be
further downcast
into Rc<ConcreteType>
where ConcreteType
implements Trait
. Read more
sourcefn as_any(&self) -> &(dyn Any + 'static)
fn as_any(&self) -> &(dyn Any + 'static)
Convert &Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &Any
’s vtable from &Trait
’s. Read more
sourcefn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
Convert &mut Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &mut Any
’s vtable from &mut Trait
’s. Read more
sourceimpl<T> DowncastSync for T where
T: Any + Send + Sync,
impl<T> DowncastSync for T where
T: Any + Send + Sync,
sourceimpl<A> DynCastExt for A
impl<A> DynCastExt for A
sourcefn dyn_cast<T>(
self
) -> Result<<A as DynCastExtHelper<T>>::Target, <A as DynCastExtHelper<T>>::Source> where
A: DynCastExtHelper<T>,
T: ?Sized,
fn dyn_cast<T>(
self
) -> Result<<A as DynCastExtHelper<T>>::Target, <A as DynCastExtHelper<T>>::Source> where
A: DynCastExtHelper<T>,
T: ?Sized,
Use this to cast from one trait object type to another. Read more
sourcefn dyn_upcast<T>(self) -> <A as DynCastExtAdvHelper<T, T>>::Target where
A: DynCastExtAdvHelper<T, T, Source = <A as DynCastExtAdvHelper<T, T>>::Target>,
T: ?Sized,
fn dyn_upcast<T>(self) -> <A as DynCastExtAdvHelper<T, T>>::Target where
A: DynCastExtAdvHelper<T, T, Source = <A as DynCastExtAdvHelper<T, T>>::Target>,
T: ?Sized,
Use this to upcast a trait to one of its supertraits. Read more
sourcefn dyn_cast_adv<F, T>(
self
) -> Result<<A as DynCastExtAdvHelper<F, T>>::Target, <A as DynCastExtAdvHelper<F, T>>::Source> where
A: DynCastExtAdvHelper<F, T>,
F: ?Sized,
T: ?Sized,
fn dyn_cast_adv<F, T>(
self
) -> Result<<A as DynCastExtAdvHelper<F, T>>::Target, <A as DynCastExtAdvHelper<F, T>>::Source> where
A: DynCastExtAdvHelper<F, T>,
F: ?Sized,
T: ?Sized,
sourcefn dyn_cast_with_config<C>(
self
) -> Result<<A as DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>>::Target, <A as DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>>::Source> where
C: DynCastConfig,
A: DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>,
fn dyn_cast_with_config<C>(
self
) -> Result<<A as DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>>::Target, <A as DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>>::Source> where
C: DynCastConfig,
A: DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>,
Use this to cast from one trait object type to another. With this method the type parameter is a config type that uniquely specifies which cast should be preformed. Read more