write_all.rs.html -- source

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abomonation

abomonated.rs lib.rs

abomonation_derive

ansi_term

ansi.rs debug.rs difference.rs display.rs lib.rs style.rs windows.rs write.rs

async_trait

args.rs expand.rs lib.rs lifetime.rs parse.rs receiver.rs

atty

bincode

de

ser

config.rs error.rs internal.rs lib.rs

bitflags

byteorder

bytes

buf

buf.rs buf_mut.rs chain.rs from_buf.rs into_buf.rs iter.rs mod.rs reader.rs take.rs vec_deque.rs writer.rs

bytes.rs debug.rs lib.rs

cfg_if

chrono

format

mod.rs parse.rs parsed.rs scan.rs strftime.rs

naive

date.rs datetime.rs internals.rs isoweek.rs time.rs

offset

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date.rs datetime.rs div.rs lib.rs round.rs

clap

dirs

dirs_sys

lib.rs xdg_user_dirs.rs

erdos

fixedbitset

lib.rs range.rs

fnv

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mpsc

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task

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future.rs lib.rs stream.rs

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futures_util

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future

io

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stream

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rand

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chacha.rs lib.rs

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hc128.rs lib.rs

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isaac.rs isaac64.rs isaac_array.rs lib.rs

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ser

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sha1

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tokio

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io

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macros

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net

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util

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coop.rs lib.rs prelude.rs

tokio_macros

entry.rs lib.rs select.rs

tokio_serde

buffer_one.rs lib.rs

tokio_serde_bincode

tokio_util

codec

bytes_codec.rs decoder.rs encoder.rs framed.rs framed_read.rs framed_write.rs length_delimited.rs lines_codec.rs mod.rs

unicode_width

lib.rs tables.rs

unicode_xid

lib.rs tables.rs

uuid

adapter

core_support

compact.rs mod.rs

parser

core_support.rs mod.rs std_support.rs

builder.rs core_support.rs lib.rs prelude.rs serde_support.rs std_support.rs v4.rs v5.rs

vec_map

use crate::io::AsyncWrite;

use std::future::Future;
use std::io;
use std::mem;
use std::pin::Pin;
use std::task::{Context, Poll};

cfg_io_util! {
    #[derive(Debug)]
    #[must_use = "futures do nothing unless you `.await` or poll them"]
    pub struct WriteAll<'a, W: ?Sized> {
        writer: &'a mut W,
        buf: &'a [u8],
    }
}

pub(crate) fn write_all<'a, W>(writer: &'a mut W, buf: &'a [u8]) -> WriteAll<'a, W>
where
    W: AsyncWrite + Unpin + ?Sized,
{
    WriteAll { writer, buf }
}

impl<W> Future for WriteAll<'_, W>
where
    W: AsyncWrite + Unpin + ?Sized,
{
    type Output = io::Result<()>;

    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
        let me = &mut *self;
        while !me.buf.is_empty() {
            let n = ready!(Pin::new(&mut me.writer).poll_write(cx, me.buf))?;
            {
                let (_, rest) = mem::replace(&mut me.buf, &[]).split_at(n);
                me.buf = rest;
            }
            if n == 0 {
                return Poll::Ready(Err(io::ErrorKind::WriteZero.into()));
            }
        }

        Poll::Ready(Ok(()))
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn assert_unpin() {
        use std::marker::PhantomPinned;
        crate::is_unpin::<WriteAll<'_, PhantomPinned>>();
    }
}

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