Struct OptionCodec

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pub struct OptionCodec<C>(/* private fields */);
Expand description

Wraps a string codec that encodes T to create a codec that encodes Option<T>.

Example:

let original_value = Some(4);
let encoded = OptionCodec::<FromToStringCodec>::encode(&original_value).unwrap();
let decoded = OptionCodec::<FromToStringCodec>::decode(&encoded).unwrap();

assert_eq!(decoded, original_value);

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impl<T, D> Decoder<Option<T>> for OptionCodec<D>
where D: Decoder<T, Encoded = str>,

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type Error = <D as Decoder<T>>::Error

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type Encoded = str

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fn decode(str: &Self::Encoded) -> Result<Option<T>, Self::Error>

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impl<T, E> Encoder<Option<T>> for OptionCodec<E>
where E: Encoder<T, Encoded = String>,

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type Error = <E as Encoder<T>>::Error

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type Encoded = String

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fn encode(val: &Option<T>) -> Result<String, Self::Error>

Auto Trait Implementations§

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impl<C> Freeze for OptionCodec<C>
where C: Freeze,

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impl<C> RefUnwindSafe for OptionCodec<C>
where C: RefUnwindSafe,

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impl<C> Send for OptionCodec<C>
where C: Send,

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impl<C> Sync for OptionCodec<C>
where C: Sync,

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impl<C> Unpin for OptionCodec<C>
where C: Unpin,

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impl<C> UnwindSafe for OptionCodec<C>
where C: UnwindSafe,

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> ArchivePointee for T

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type ArchivedMetadata = ()

The archived version of the pointer metadata for this type.
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fn pointer_metadata( _: &<T as ArchivePointee>::ArchivedMetadata, ) -> <T as Pointee>::Metadata

Converts some archived metadata to the pointer metadata for itself.
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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, D> HybridDecoder<T, str> for D
where D: Decoder<T, Encoded = str>,

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impl<T, E> HybridEncoder<T, String> for E
where E: Encoder<T, Encoded = String>,

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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> LayoutRaw for T

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fn layout_raw(_: <T as Pointee>::Metadata) -> Result<Layout, LayoutError>

Returns the layout of the type.
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impl<T, N1, N2> Niching<NichedOption<T, N1>> for N2
where T: SharedNiching<N1, N2>, N1: Niching<T>, N2: Niching<T>,

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unsafe fn is_niched(niched: *const NichedOption<T, N1>) -> bool

Returns whether the given value has been niched. Read more
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fn resolve_niched(out: Place<NichedOption<T, N1>>)

Writes data to out indicating that a T is niched.
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impl<T> Pointee for T

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type Metadata = ()

The metadata type for pointers and references to this type.
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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.