async_codec_util::decoder

Struct Map

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pub struct Map<D, F> { /* private fields */ }
Expand description

Change the return type of a decoder by mapping its item through a function.

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impl<D, F> Map<D, F>

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pub fn new(dec: D, f: F) -> Map<D, F>

Chain a compution on the result of a decoder.

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impl<D, F, U> AsyncDecode for Map<D, F>
where D: AsyncDecode, F: FnOnce(D::Item) -> U,

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type Item = U

The type of the value to decode.
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type Error = <D as AsyncDecode>::Error

An error indicating how decoding can fail.
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fn poll_decode<R: AsyncRead>( self, cx: &mut Context<'_>, reader: &mut R, ) -> PollDec<Self::Item, Self, Self::Error>

Call reader.poll_read exactly once, propgating any Err and Pending, and return how many bytes have been read, as well as the decoded value, once decoding is done. Read more

Auto Trait Implementations§

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impl<D, F> Freeze for Map<D, F>
where D: Freeze, F: Freeze,

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impl<D, F> RefUnwindSafe for Map<D, F>
where D: RefUnwindSafe, F: RefUnwindSafe,

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impl<D, F> Send for Map<D, F>
where D: Send, F: Send,

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impl<D, F> Sync for Map<D, F>
where D: Sync, F: Sync,

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impl<D, F> Unpin for Map<D, F>
where D: Unpin, F: Unpin,

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impl<D, F> UnwindSafe for Map<D, F>
where D: UnwindSafe, F: UnwindSafe,

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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> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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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.