Function tokio_io_utility::read_to_vec

pub fn read_to_vec<'a, T: AsyncRead + ?Sized + Unpin>(
    reader: &'a mut T,
    vec: &'a mut Vec<u8>
) -> ReadToVecFuture<'a, T> 

Try to fill data from reader into the spare capacity of vec.

It can be used to implement buffering.

Return std::io::ErrorKind::UnexpectedEof on Eof.

NOTE that this function does not modify any existing data.

Cancel safety

It is cancel safe and dropping the returned future will not stop the wakeup from happening.