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NullableDeserializeSeed

Struct NullableDeserializeSeed 

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pub struct NullableDeserializeSeed<S>(pub S);
Available on crate feature json only.
Expand description

DeserializeSeed that detects JSON null and returns None instead of delegating to the inner seed. Used by generated oneof deserializers so that null means “this variant is not set”.

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§0: S

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impl<'de, S> DeserializeSeed<'de> for NullableDeserializeSeed<S>
where S: DeserializeSeed<'de>,

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type Value = Option<<S as DeserializeSeed<'de>>::Value>

The type produced by using this seed.
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fn deserialize<D: Deserializer<'de>>( self, d: D, ) -> Result<Self::Value, D::Error>

Equivalent to the more common Deserialize::deserialize method, except with some initial piece of data (the seed) passed in.

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Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.