Merge pull request #526 from yjhmelody/refactor-dir

refactor io dir to be same with std and export IntoInnerError

src/io/buf_reader.rs

@@ -4,11 +4,9 @@ use std::{cmp, fmt};
 
 use pin_project_lite::pin_project;
 
-use crate::io::{self, BufRead, Read, Seek, SeekFrom};
+use crate::io::{self, BufRead, Read, Seek, SeekFrom, DEFAULT_BUF_SIZE};
 use crate::task::{Context, Poll};
 
-const DEFAULT_CAPACITY: usize = 8 * 1024;
-
 pin_project! {
     /// Adds buffering to any reader.
     ///
@@ -72,7 +70,7 @@ impl<R: io::Read> BufReader<R> {
     /// # Ok(()) }) }
     /// ```
     pub fn new(inner: R) -> BufReader<R> {
-        BufReader::with_capacity(DEFAULT_CAPACITY, inner)
+        BufReader::with_capacity(DEFAULT_BUF_SIZE, inner)
     }
 
     /// Creates a new buffered reader with the specified capacity.

src/io/buf_writer.rs

@@ -4,11 +4,9 @@ use std::pin::Pin;
 use pin_project_lite::pin_project;
 
 use crate::io::write::WriteExt;
-use crate::io::{self, Seek, SeekFrom, Write};
+use crate::io::{self, Seek, SeekFrom, Write, DEFAULT_BUF_SIZE};
 use crate::task::{Context, Poll, ready};
 
-const DEFAULT_CAPACITY: usize = 8 * 1024;
-
 pin_project! {
     /// Wraps a writer and buffers its output.
     ///
@@ -87,8 +85,32 @@ pin_project! {
     }
 }
 
+/// An error returned by `into_inner` which combines an error that
+/// happened while writing out the buffer, and the buffered writer object
+/// which may be used to recover from the condition.
+///
+/// # Examples
+///
+/// ```no_run
+/// # fn main() -> std::io::Result<()> { async_std::task::block_on(async {
+/// use async_std::io::BufWriter;
+/// use async_std::net::TcpStream;
+///
+/// let buf_writer = BufWriter::new(TcpStream::connect("127.0.0.1:34251").await?);
+///
+/// // unwrap the TcpStream and flush the buffer
+/// let stream = match buf_writer.into_inner().await {
+///     Ok(s) => s,
+///     Err(e) => {
+///         // Here, e is an IntoInnerError
+///         panic!("An error occurred");
+///     }
+/// };
+/// #
+/// # Ok(()) }) }
+///```
 #[derive(Debug)]
-pub struct IntoInnerError<W>(W, std::io::Error);
+pub struct IntoInnerError<W>(W, crate::io::Error);
 
 impl<W: Write> BufWriter<W> {
     /// Creates a new `BufWriter` with a default buffer capacity. The default is currently 8 KB,
@@ -107,7 +129,7 @@ impl<W: Write> BufWriter<W> {
     /// # Ok(()) }) }
     /// ```
     pub fn new(inner: W) -> BufWriter<W> {
-        BufWriter::with_capacity(DEFAULT_CAPACITY, inner)
+        BufWriter::with_capacity(DEFAULT_BUF_SIZE, inner)
     }
 
     /// Creates a new `BufWriter` with the specified buffer capacity.

src/io/mod.rs

@@ -269,13 +269,15 @@
 //! [`Result`]: https://doc.rust-lang.org/std/result/enum.Result.html
 //! [`.unwrap()`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap
 
+const DEFAULT_BUF_SIZE: usize = 8 * 1024;
+
 cfg_std! {
     #[doc(inline)]
     pub use std::io::{Error, ErrorKind, IoSlice, IoSliceMut, Result, SeekFrom};
 
     pub use buf_read::{BufRead, Lines};
     pub use buf_reader::BufReader;
-    pub use buf_writer::BufWriter;
+    pub use buf_writer::{BufWriter, IntoInnerError};
     pub use copy::copy;
     pub use cursor::Cursor;
     pub use empty::{empty, Empty};