Struct serde::ser::Impossible
source · [−]pub struct Impossible<Ok, Error> { /* private fields */ }
Expand description
Helper type for implementing a Serializer
that does not support
serializing one of the compound types.
This type cannot be instantiated, but implements every one of the traits
corresponding to the Serializer
compound types: SerializeSeq
,
SerializeTuple
, SerializeTupleStruct
, SerializeTupleVariant
,
SerializeMap
, SerializeStruct
, and SerializeStructVariant
.
ⓘ
impl Serializer for MySerializer {
type Ok = ();
type Error = Error;
type SerializeSeq = Impossible<(), Error>;
/* other associated types */
/// This data format does not support serializing sequences.
fn serialize_seq(self,
len: Option<usize>)
-> Result<Self::SerializeSeq, Error> {
// Given Impossible cannot be instantiated, the only
// thing we can do here is to return an error.
Err(...)
}
/* other Serializer methods */
}
Trait Implementations
sourceimpl<Ok, Error> SerializeMap for Impossible<Ok, Error> where
Error: Error,
impl<Ok, Error> SerializeMap for Impossible<Ok, Error> where
Error: Error,
type Ok = Ok
type Ok = Ok
Must match the Ok
type of our Serializer
.
type Error = Error
type Error = Error
Must match the Error
type of our Serializer
.
sourcefn serialize_key<T: ?Sized>(&mut self, key: &T) -> Result<(), Error> where
T: Serialize,
fn serialize_key<T: ?Sized>(&mut self, key: &T) -> Result<(), Error> where
T: Serialize,
Serialize a map key. Read more
sourceimpl<Ok, Error> SerializeSeq for Impossible<Ok, Error> where
Error: Error,
impl<Ok, Error> SerializeSeq for Impossible<Ok, Error> where
Error: Error,
sourceimpl<Ok, Error> SerializeStruct for Impossible<Ok, Error> where
Error: Error,
impl<Ok, Error> SerializeStruct for Impossible<Ok, Error> where
Error: Error,
sourceimpl<Ok, Error> SerializeStructVariant for Impossible<Ok, Error> where
Error: Error,
impl<Ok, Error> SerializeStructVariant for Impossible<Ok, Error> where
Error: Error,
sourceimpl<Ok, Error> SerializeTuple for Impossible<Ok, Error> where
Error: Error,
impl<Ok, Error> SerializeTuple for Impossible<Ok, Error> where
Error: Error,
sourceimpl<Ok, Error> SerializeTupleStruct for Impossible<Ok, Error> where
Error: Error,
impl<Ok, Error> SerializeTupleStruct for Impossible<Ok, Error> where
Error: Error,
sourceimpl<Ok, Error> SerializeTupleVariant for Impossible<Ok, Error> where
Error: Error,
impl<Ok, Error> SerializeTupleVariant for Impossible<Ok, Error> where
Error: Error,
Auto Trait Implementations
impl<Ok, Error> RefUnwindSafe for Impossible<Ok, Error> where
Error: RefUnwindSafe,
Ok: RefUnwindSafe,
impl<Ok, Error> Send for Impossible<Ok, Error> where
Error: Send,
Ok: Send,
impl<Ok, Error> Sync for Impossible<Ok, Error> where
Error: Sync,
Ok: Sync,
impl<Ok, Error> Unpin for Impossible<Ok, Error> where
Error: Unpin,
Ok: Unpin,
impl<Ok, Error> UnwindSafe for Impossible<Ok, Error> where
Error: UnwindSafe,
Ok: UnwindSafe,
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