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§
source§impl<Ok, Error> SerializeMap for Impossible<Ok, Error>where
Error: Error,
impl<Ok, Error> SerializeMap for Impossible<Ok, Error>where
Error: Error,
source§impl<Ok, Error> SerializeSeq for Impossible<Ok, Error>where
Error: Error,
impl<Ok, Error> SerializeSeq for Impossible<Ok, Error>where
Error: Error,
source§impl<Ok, Error> SerializeStruct for Impossible<Ok, Error>where
Error: Error,
impl<Ok, Error> SerializeStruct for Impossible<Ok, Error>where
Error: Error,
source§impl<Ok, Error> SerializeStructVariant for Impossible<Ok, Error>where
Error: Error,
impl<Ok, Error> SerializeStructVariant for Impossible<Ok, Error>where
Error: Error,
source§impl<Ok, Error> SerializeTuple for Impossible<Ok, Error>where
Error: Error,
impl<Ok, Error> SerializeTuple for Impossible<Ok, Error>where
Error: Error,
source§impl<Ok, Error> SerializeTupleStruct for Impossible<Ok, Error>where
Error: Error,
impl<Ok, Error> SerializeTupleStruct for Impossible<Ok, Error>where
Error: Error,
source§impl<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> Freeze for Impossible<Ok, Error>
impl<Ok, Error> RefUnwindSafe for Impossible<Ok, Error>where
Ok: RefUnwindSafe,
Error: RefUnwindSafe,
impl<Ok, Error> Send for Impossible<Ok, Error>
impl<Ok, Error> Sync for Impossible<Ok, Error>
impl<Ok, Error> Unpin for Impossible<Ok, Error>
impl<Ok, Error> UnwindSafe for Impossible<Ok, Error>where
Ok: UnwindSafe,
Error: 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