Add in generic type to description of BufReader and BufWriter

This commit is contained in:
John Erickson 2019-08-09 07:36:39 -07:00
parent c8e474871a
commit cccce09dda

View File

@ -9,21 +9,21 @@ use crate::io::{self, Initializer, DEFAULT_BUF_SIZE, Error, ErrorKind, SeekFrom,
IoSliceMut};
use crate::memchr;
/// The `BufReader` struct adds buffering to any reader.
/// The `BufReader<R>` struct adds buffering to any reader.
///
/// It can be excessively inefficient to work directly with a [`Read`] instance.
/// For example, every call to [`read`][`TcpStream::read`] on [`TcpStream`]
/// results in a system call. A `BufReader` performs large, infrequent reads on
/// results in a system call. A `BufReader<R>` performs large, infrequent reads on
/// the underlying [`Read`] and maintains an in-memory buffer of the results.
///
/// `BufReader` can improve the speed of programs that make *small* and
/// `BufReader<R>` can improve the speed of programs that make *small* and
/// *repeated* read calls to the same file or network socket. It does not
/// help when reading very large amounts at once, or reading just one or a few
/// times. It also provides no advantage when reading from a source that is
/// already in memory, like a `Vec<u8>`.
///
/// When the `BufReader` is dropped, the contents of its buffer will be
/// discarded. Creating multiple instances of a `BufReader` on the same
/// When the `BufReader<R>` is dropped, the contents of its buffer will be
/// discarded. Creating multiple instances of a `BufReader<R>` on the same
/// stream can cause data loss.
///
/// [`Read`]: ../../std/io/trait.Read.html
@ -56,7 +56,7 @@ pub struct BufReader<R> {
}
impl<R: Read> BufReader<R> {
/// Creates a new `BufReader` with a default buffer capacity. The default is currently 8 KB,
/// Creates a new `BufReader<R>` with a default buffer capacity. The default is currently 8 KB,
/// but may change in the future.
///
/// # Examples
@ -76,7 +76,7 @@ impl<R: Read> BufReader<R> {
BufReader::with_capacity(DEFAULT_BUF_SIZE, inner)
}
/// Creates a new `BufReader` with the specified buffer capacity.
/// Creates a new `BufReader<R>` with the specified buffer capacity.
///
/// # Examples
///
@ -177,7 +177,7 @@ impl<R> BufReader<R> {
&self.buf[self.pos..self.cap]
}
/// Unwraps this `BufReader`, returning the underlying reader.
/// Unwraps this `BufReader<R>`, returning the underlying reader.
///
/// Note that any leftover data in the internal buffer is lost.
///
@ -304,7 +304,7 @@ impl<R: Seek> Seek for BufReader<R> {
/// Seek to an offset, in bytes, in the underlying reader.
///
/// The position used for seeking with `SeekFrom::Current(_)` is the
/// position the underlying reader would be at if the `BufReader` had no
/// position the underlying reader would be at if the `BufReader<R>` had no
/// internal buffer.
///
/// Seeking always discards the internal buffer, even if the seek position
@ -355,16 +355,16 @@ impl<R: Seek> Seek for BufReader<R> {
/// It can be excessively inefficient to work directly with something that
/// implements [`Write`]. For example, every call to
/// [`write`][`TcpStream::write`] on [`TcpStream`] results in a system call. A
/// `BufWriter` keeps an in-memory buffer of data and writes it to an underlying
/// `BufWriter<W>` keeps an in-memory buffer of data and writes it to an underlying
/// writer in large, infrequent batches.
///
/// `BufWriter` can improve the speed of programs that make *small* and
/// `BufWriter<W>` can improve the speed of programs that make *small* and
/// *repeated* write calls to the same file or network socket. It does not
/// help when writing very large amounts at once, or writing just one or a few
/// times. It also provides no advantage when writing to a destination that is
/// in memory, like a `Vec<u8>`.
///
/// It is critical to call [`flush`] before `BufWriter` is dropped. Though
/// It is critical to call [`flush`] before `BufWriter<W>` is dropped. Though
/// dropping will attempt to flush the the contents of the buffer, any errors
/// that happen in the process will be ignored. Calling ['flush'] ensures that
/// the buffer is empty and all errors have been observed.
@ -386,7 +386,7 @@ impl<R: Seek> Seek for BufReader<R> {
///
/// Because we're not buffering, we write each one in turn, incurring the
/// overhead of a system call per byte written. We can fix this with a
/// `BufWriter`:
/// `BufWriter<W>`:
///
/// ```no_run
/// use std::io::prelude::*;
@ -401,7 +401,7 @@ impl<R: Seek> Seek for BufReader<R> {
/// stream.flush().unwrap();
/// ```
///
/// By wrapping the stream with a `BufWriter`, these ten writes are all grouped
/// By wrapping the stream with a `BufWriter<W>`, these ten writes are all grouped
/// together by the buffer and will all be written out in one system call when
/// the `stream` is flushed.
///
@ -448,7 +448,7 @@ pub struct BufWriter<W: Write> {
pub struct IntoInnerError<W>(W, Error);
impl<W: Write> BufWriter<W> {
/// Creates a new `BufWriter` with a default buffer capacity. The default is currently 8 KB,
/// Creates a new `BufWriter<W>` with a default buffer capacity. The default is currently 8 KB,
/// but may change in the future.
///
/// # Examples
@ -464,7 +464,7 @@ impl<W: Write> BufWriter<W> {
BufWriter::with_capacity(DEFAULT_BUF_SIZE, inner)
}
/// Creates a new `BufWriter` with the specified buffer capacity.
/// Creates a new `BufWriter<W>` with the specified buffer capacity.
///
/// # Examples
///
@ -565,7 +565,7 @@ impl<W: Write> BufWriter<W> {
&self.buf
}
/// Unwraps this `BufWriter`, returning the underlying writer.
/// Unwraps this `BufWriter<W>`, returning the underlying writer.
///
/// The buffer is written out before returning the writer.
///