Struct async_codec_util::decoder::Map

pub struct Map<D, F> { /* fields omitted */ }

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

Methods

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

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

Chain a compution on the result of a decoder.

Trait Implementations

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

type Item = U

The type of the value to decode.

type Error = D::Error

An error indicating how decoding can fail.

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.