1 // Copyright 2013 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 //! Implementations of I/O traits for the IoResult type
13 //! I/O constructors return option types to allow errors to be handled.
14 //! These implementations allow e.g. `IoResult<File>` to be used
15 //! as a `Reader` without unwrapping the result first.
18 use result::Result::{Ok, Err};
19 use super::{Reader, Writer, Listener, Acceptor, Seek, SeekStyle, IoResult};
21 impl<W: Writer> Writer for IoResult<W> {
22 fn write_all(&mut self, buf: &[u8]) -> IoResult<()> {
24 Ok(ref mut writer) => writer.write_all(buf),
25 Err(ref e) => Err((*e).clone())
29 fn flush(&mut self) -> IoResult<()> {
31 Ok(ref mut writer) => writer.flush(),
32 Err(ref e) => Err(e.clone()),
37 impl<R: Reader> Reader for IoResult<R> {
38 fn read(&mut self, buf: &mut [u8]) -> IoResult<usize> {
40 Ok(ref mut reader) => reader.read(buf),
41 Err(ref e) => Err(e.clone()),
46 impl<S: Seek> Seek for IoResult<S> {
47 fn tell(&self) -> IoResult<u64> {
49 Ok(ref seeker) => seeker.tell(),
50 Err(ref e) => Err(e.clone()),
53 fn seek(&mut self, pos: i64, style: SeekStyle) -> IoResult<()> {
55 Ok(ref mut seeker) => seeker.seek(pos, style),
56 Err(ref e) => Err(e.clone())
61 impl<A: Acceptor, L: Listener<A>> Listener<A> for IoResult<L> {
62 fn listen(self) -> IoResult<A> {
64 Ok(listener) => listener.listen(),
70 impl<A: Acceptor> Acceptor for IoResult<A> {
71 type Connection = A::Connection;
72 fn accept(&mut self) -> IoResult<A::Connection> {
74 Ok(ref mut acceptor) => acceptor.accept(),
75 Err(ref e) => Err(e.clone()),
83 use super::super::mem::*;
84 use old_io::{self, Reader, Writer};
87 fn test_option_writer() {
88 let mut writer: old_io::IoResult<Vec<u8>> = Ok(Vec::new());
89 writer.write_all(&[0, 1, 2]).unwrap();
90 writer.flush().unwrap();
91 assert_eq!(writer.unwrap(), [0, 1, 2]);
95 fn test_option_writer_error() {
96 let mut writer: old_io::IoResult<Vec<u8>> =
97 Err(old_io::standard_error(old_io::EndOfFile));
99 match writer.write_all(&[0, 0, 0]) {
101 Err(e) => assert_eq!(e.kind, old_io::EndOfFile),
103 match writer.flush() {
105 Err(e) => assert_eq!(e.kind, old_io::EndOfFile),
110 fn test_option_reader() {
111 let mut reader: old_io::IoResult<MemReader> =
112 Ok(MemReader::new(vec!(0, 1, 2, 3)));
113 let mut buf = [0, 0];
114 reader.read(&mut buf).unwrap();
115 let b: &[_] = &[0, 1];
120 fn test_option_reader_error() {
121 let mut reader: old_io::IoResult<MemReader> =
122 Err(old_io::standard_error(old_io::EndOfFile));
125 match reader.read(&mut buf) {
127 Err(e) => assert_eq!(e.kind, old_io::EndOfFile),