Struct holochain::prelude::kitsune_p2p::dependencies::kitsune_p2p_types::dependencies::lair_keystore_api::dependencies::hc_seed_bundle::dependencies::serde::de::IgnoredAny
source · pub struct IgnoredAny;
Expand description
An efficient way of discarding data from a deserializer.
Think of this like serde_json::Value
in that it can be deserialized from
any type, except that it does not store any information about the data that
gets deserialized.
ⓘ
use std::fmt;
use std::marker::PhantomData;
use serde::de::{
self, Deserialize, DeserializeSeed, Deserializer, IgnoredAny, SeqAccess, Visitor,
};
/// A seed that can be used to deserialize only the `n`th element of a sequence
/// while efficiently discarding elements of any type before or after index `n`.
///
/// For example to deserialize only the element at index 3:
///
/// ```
/// NthElement::new(3).deserialize(deserializer)
/// ```
pub struct NthElement<T> {
n: usize,
marker: PhantomData<T>,
}
impl<T> NthElement<T> {
pub fn new(n: usize) -> Self {
NthElement {
n: n,
marker: PhantomData,
}
}
}
impl<'de, T> Visitor<'de> for NthElement<T>
where
T: Deserialize<'de>,
{
type Value = T;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
write!(
formatter,
"a sequence in which we care about element {}",
self.n
)
}
fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
where
A: SeqAccess<'de>,
{
// Skip over the first `n` elements.
for i in 0..self.n {
// It is an error if the sequence ends before we get to element `n`.
if seq.next_element::<IgnoredAny>()?.is_none() {
return Err(de::Error::invalid_length(i, &self));
}
}
// Deserialize the one we care about.
let nth = match seq.next_element()? {
Some(nth) => nth,
None => {
return Err(de::Error::invalid_length(self.n, &self));
}
};
// Skip over any remaining elements in the sequence after `n`.
while let Some(IgnoredAny) = seq.next_element()? {
// ignore
}
Ok(nth)
}
}
impl<'de, T> DeserializeSeed<'de> for NthElement<T>
where
T: Deserialize<'de>,
{
type Value = T;
fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
where
D: Deserializer<'de>,
{
deserializer.deserialize_seq(self)
}
}
// Deserialize only the sequence element at index 3 from this deserializer.
// The element at index 3 is required to be a string. Elements before and
// after index 3 are allowed to be of any type.
let s: String = NthElement::new(3).deserialize(deserializer)?;
Trait Implementations§
source§impl Clone for IgnoredAny
impl Clone for IgnoredAny
source§fn clone(&self) -> IgnoredAny
fn clone(&self) -> IgnoredAny
Returns a copy of the value. Read more
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from
source
. Read moresource§impl Debug for IgnoredAny
impl Debug for IgnoredAny
source§impl Default for IgnoredAny
impl Default for IgnoredAny
source§fn default() -> IgnoredAny
fn default() -> IgnoredAny
Returns the “default value” for a type. Read more
source§impl<'de> Deserialize<'de> for IgnoredAny
impl<'de> Deserialize<'de> for IgnoredAny
source§fn deserialize<D>(
deserializer: D
) -> Result<IgnoredAny, <D as Deserializer<'de>>::Error>where
D: Deserializer<'de>,
fn deserialize<D>(
deserializer: D
) -> Result<IgnoredAny, <D as Deserializer<'de>>::Error>where
D: Deserializer<'de>,
Deserialize this value from the given Serde deserializer. Read more
source§impl<'de> Visitor<'de> for IgnoredAny
impl<'de> Visitor<'de> for IgnoredAny
§type Value = IgnoredAny
type Value = IgnoredAny
The value produced by this visitor.
source§fn expecting(&self, formatter: &mut Formatter<'_>) -> Result<(), Error>
fn expecting(&self, formatter: &mut Formatter<'_>) -> Result<(), Error>
Format a message stating what data this Visitor expects to receive. Read more
source§fn visit_bool<E>(self, x: bool) -> Result<<IgnoredAny as Visitor<'de>>::Value, E>
fn visit_bool<E>(self, x: bool) -> Result<<IgnoredAny as Visitor<'de>>::Value, E>
The input contains a boolean. Read more
source§fn visit_i64<E>(self, x: i64) -> Result<<IgnoredAny as Visitor<'de>>::Value, E>
fn visit_i64<E>(self, x: i64) -> Result<<IgnoredAny as Visitor<'de>>::Value, E>
The input contains an
i64
. Read moresource§fn visit_i128<E>(self, x: i128) -> Result<<IgnoredAny as Visitor<'de>>::Value, E>
fn visit_i128<E>(self, x: i128) -> Result<<IgnoredAny as Visitor<'de>>::Value, E>
The input contains a
i128
. Read moresource§fn visit_u64<E>(self, x: u64) -> Result<<IgnoredAny as Visitor<'de>>::Value, E>
fn visit_u64<E>(self, x: u64) -> Result<<IgnoredAny as Visitor<'de>>::Value, E>
The input contains a
u64
. Read moresource§fn visit_u128<E>(self, x: u128) -> Result<<IgnoredAny as Visitor<'de>>::Value, E>
fn visit_u128<E>(self, x: u128) -> Result<<IgnoredAny as Visitor<'de>>::Value, E>
The input contains a
u128
. Read moresource§fn visit_f64<E>(self, x: f64) -> Result<<IgnoredAny as Visitor<'de>>::Value, E>
fn visit_f64<E>(self, x: f64) -> Result<<IgnoredAny as Visitor<'de>>::Value, E>
The input contains an
f64
. Read moresource§fn visit_str<E>(self, s: &str) -> Result<<IgnoredAny as Visitor<'de>>::Value, E>where
E: Error,
fn visit_str<E>(self, s: &str) -> Result<<IgnoredAny as Visitor<'de>>::Value, E>where
E: Error,
The input contains a string. The lifetime of the string is ephemeral and
it may be destroyed after this method returns. Read more
source§fn visit_none<E>(self) -> Result<<IgnoredAny as Visitor<'de>>::Value, E>
fn visit_none<E>(self) -> Result<<IgnoredAny as Visitor<'de>>::Value, E>
The input contains an optional that is absent. Read more
source§fn visit_some<D>(
self,
deserializer: D
) -> Result<<IgnoredAny as Visitor<'de>>::Value, <D as Deserializer<'de>>::Error>where
D: Deserializer<'de>,
fn visit_some<D>(
self,
deserializer: D
) -> Result<<IgnoredAny as Visitor<'de>>::Value, <D as Deserializer<'de>>::Error>where
D: Deserializer<'de>,
The input contains an optional that is present. Read more
source§fn visit_newtype_struct<D>(
self,
deserializer: D
) -> Result<<IgnoredAny as Visitor<'de>>::Value, <D as Deserializer<'de>>::Error>where
D: Deserializer<'de>,
fn visit_newtype_struct<D>(
self,
deserializer: D
) -> Result<<IgnoredAny as Visitor<'de>>::Value, <D as Deserializer<'de>>::Error>where
D: Deserializer<'de>,
The input contains a newtype struct. Read more
source§fn visit_unit<E>(self) -> Result<<IgnoredAny as Visitor<'de>>::Value, E>
fn visit_unit<E>(self) -> Result<<IgnoredAny as Visitor<'de>>::Value, E>
The input contains a unit
()
. Read moresource§fn visit_seq<A>(
self,
seq: A
) -> Result<<IgnoredAny as Visitor<'de>>::Value, <A as SeqAccess<'de>>::Error>where
A: SeqAccess<'de>,
fn visit_seq<A>(
self,
seq: A
) -> Result<<IgnoredAny as Visitor<'de>>::Value, <A as SeqAccess<'de>>::Error>where
A: SeqAccess<'de>,
The input contains a sequence of elements. Read more
source§fn visit_map<A>(
self,
map: A
) -> Result<<IgnoredAny as Visitor<'de>>::Value, <A as MapAccess<'de>>::Error>where
A: MapAccess<'de>,
fn visit_map<A>(
self,
map: A
) -> Result<<IgnoredAny as Visitor<'de>>::Value, <A as MapAccess<'de>>::Error>where
A: MapAccess<'de>,
The input contains a key-value map. Read more
source§fn visit_bytes<E>(
self,
bytes: &[u8]
) -> Result<<IgnoredAny as Visitor<'de>>::Value, E>where
E: Error,
fn visit_bytes<E>(
self,
bytes: &[u8]
) -> Result<<IgnoredAny as Visitor<'de>>::Value, E>where
E: Error,
The input contains a byte array. The lifetime of the byte array is
ephemeral and it may be destroyed after this method returns. Read more
source§fn visit_enum<A>(
self,
data: A
) -> Result<<IgnoredAny as Visitor<'de>>::Value, <A as EnumAccess<'de>>::Error>where
A: EnumAccess<'de>,
fn visit_enum<A>(
self,
data: A
) -> Result<<IgnoredAny as Visitor<'de>>::Value, <A as EnumAccess<'de>>::Error>where
A: EnumAccess<'de>,
The input contains an enum. Read more
source§fn visit_i8<E>(self, v: i8) -> Result<Self::Value, E>where
E: Error,
fn visit_i8<E>(self, v: i8) -> Result<Self::Value, E>where
E: Error,
The input contains an
i8
. Read moresource§fn visit_i16<E>(self, v: i16) -> Result<Self::Value, E>where
E: Error,
fn visit_i16<E>(self, v: i16) -> Result<Self::Value, E>where
E: Error,
The input contains an
i16
. Read moresource§fn visit_i32<E>(self, v: i32) -> Result<Self::Value, E>where
E: Error,
fn visit_i32<E>(self, v: i32) -> Result<Self::Value, E>where
E: Error,
The input contains an
i32
. Read moresource§fn visit_u8<E>(self, v: u8) -> Result<Self::Value, E>where
E: Error,
fn visit_u8<E>(self, v: u8) -> Result<Self::Value, E>where
E: Error,
The input contains a
u8
. Read moresource§fn visit_u16<E>(self, v: u16) -> Result<Self::Value, E>where
E: Error,
fn visit_u16<E>(self, v: u16) -> Result<Self::Value, E>where
E: Error,
The input contains a
u16
. Read moresource§fn visit_u32<E>(self, v: u32) -> Result<Self::Value, E>where
E: Error,
fn visit_u32<E>(self, v: u32) -> Result<Self::Value, E>where
E: Error,
The input contains a
u32
. Read moresource§fn visit_f32<E>(self, v: f32) -> Result<Self::Value, E>where
E: Error,
fn visit_f32<E>(self, v: f32) -> Result<Self::Value, E>where
E: Error,
The input contains an
f32
. Read moresource§fn visit_char<E>(self, v: char) -> Result<Self::Value, E>where
E: Error,
fn visit_char<E>(self, v: char) -> Result<Self::Value, E>where
E: Error,
The input contains a
char
. Read moresource§fn visit_borrowed_str<E>(self, v: &'de str) -> Result<Self::Value, E>where
E: Error,
fn visit_borrowed_str<E>(self, v: &'de str) -> Result<Self::Value, E>where
E: Error,
The input contains a string that lives at least as long as the
Deserializer
. Read moresource§fn visit_string<E>(self, v: String) -> Result<Self::Value, E>where
E: Error,
fn visit_string<E>(self, v: String) -> Result<Self::Value, E>where
E: Error,
The input contains a string and ownership of the string is being given
to the
Visitor
. Read moreimpl Copy for IgnoredAny
Auto Trait Implementations§
impl RefUnwindSafe for IgnoredAny
impl Send for IgnoredAny
impl Sync for IgnoredAny
impl Unpin for IgnoredAny
impl UnwindSafe for IgnoredAny
Blanket Implementations§
§impl<T> Any for Twhere
T: Any + ?Sized,
impl<T> Any for Twhere
T: Any + ?Sized,
§fn type_id_compat(&self) -> TypeId
fn type_id_compat(&self) -> TypeId
TODO: once 1.33.0 is the minimum supported compiler version, remove
Any::type_id_compat and use StdAny::type_id instead.
https://github.com/rust-lang/rust/issues/27745
§impl<T> ArchivePointee for T
impl<T> ArchivePointee for T
§type ArchivedMetadata = ()
type ArchivedMetadata = ()
The archived version of the pointer metadata for this type.
§fn pointer_metadata(
_: &<T as ArchivePointee>::ArchivedMetadata
) -> <T as Pointee>::Metadata
fn pointer_metadata(
_: &<T as ArchivePointee>::ArchivedMetadata
) -> <T as Pointee>::Metadata
Converts some archived metadata to the pointer metadata for itself.
§impl<F, W, T, D> Deserialize<With<T, W>, D> for Fwhere
W: DeserializeWith<F, T, D>,
D: Fallible + ?Sized,
F: ?Sized,
impl<F, W, T, D> Deserialize<With<T, W>, D> for Fwhere
W: DeserializeWith<F, T, D>,
D: Fallible + ?Sized,
F: ?Sized,
§fn deserialize(
&self,
deserializer: &mut D
) -> Result<With<T, W>, <D as Fallible>::Error>
fn deserialize(
&self,
deserializer: &mut D
) -> Result<With<T, W>, <D as Fallible>::Error>
Deserializes using the given deserializer
§impl<T> FutureExt for T
impl<T> FutureExt for T
§fn with_context(self, otel_cx: Context) -> WithContext<Self> ⓘ
fn with_context(self, otel_cx: Context) -> WithContext<Self> ⓘ
§fn with_current_context(self) -> WithContext<Self> ⓘ
fn with_current_context(self) -> WithContext<Self> ⓘ
source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self> ⓘ
fn instrument(self, span: Span) -> Instrumented<Self> ⓘ
source§fn in_current_span(self) -> Instrumented<Self> ⓘ
fn in_current_span(self) -> Instrumented<Self> ⓘ
source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self> ⓘ
fn instrument(self, span: Span) -> Instrumented<Self> ⓘ
source§fn in_current_span(self) -> Instrumented<Self> ⓘ
fn in_current_span(self) -> Instrumented<Self> ⓘ
§impl<T> Pointable for T
impl<T> Pointable for T
§impl<SS, SP> SupersetOf<SS> for SPwhere
SS: SubsetOf<SP>,
impl<SS, SP> SupersetOf<SS> for SPwhere
SS: SubsetOf<SP>,
§fn to_subset(&self) -> Option<SS>
fn to_subset(&self) -> Option<SS>
The inverse inclusion map: attempts to construct
self
from the equivalent element of its
superset. Read more§fn is_in_subset(&self) -> bool
fn is_in_subset(&self) -> bool
Checks if
self
is actually part of its subset T
(and can be converted to it).§fn to_subset_unchecked(&self) -> SS
fn to_subset_unchecked(&self) -> SS
Use with care! Same as
self.to_subset
but without any property checks. Always succeeds.§fn from_subset(element: &SS) -> SP
fn from_subset(element: &SS) -> SP
The inclusion map: converts
self
to the equivalent element of its superset.§impl<T> Upcastable for Twhere
T: 'static + Any + Send + Sync,
impl<T> Upcastable for Twhere
T: 'static + Any + Send + Sync,
§fn upcast_any_ref(&self) -> &(dyn Any + 'static)
fn upcast_any_ref(&self) -> &(dyn Any + 'static)
upcast ref
§fn upcast_any_mut(&mut self) -> &mut (dyn Any + 'static)
fn upcast_any_mut(&mut self) -> &mut (dyn Any + 'static)
upcast mut ref