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use ::io::MapNonBlock;
use std::io::{self, Read, Write};

pub trait TryRead {
    fn try_read(&mut self, buf: &mut [u8]) -> io::Result<Option<usize>>;
}

pub trait TryWrite {
    fn try_write(&mut self, buf: &[u8]) -> io::Result<Option<usize>>;
}

impl<T: Read> TryRead for T {
    fn try_read(&mut self, dst: &mut [u8]) -> io::Result<Option<usize>> {
        self.read(dst).map_non_block()
    }
}

impl<T: Write> TryWrite for T {
    fn try_write(&mut self, src: &[u8]) -> io::Result<Option<usize>> {
        self.write(src).map_non_block()
    }
}

pub trait TryAccept {
    type Output;

    fn accept(&self) -> io::Result<Option<Self::Output>>;
}