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d597da32
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d597da32
编写于
2月 01, 2018
作者:
C
Corey Farwell
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电子邮件补丁
差异文件
Clarify shared file handler behavior of File::try_clone.
Fixes
https://github.com/rust-lang/rust/issues/46578
.
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8ccab7ee
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1 changed file
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29 addition
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7 deletion
+29
-7
src/libstd/fs.rs
src/libstd/fs.rs
+29
-7
未找到文件。
src/libstd/fs.rs
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d597da32
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@@ -482,20 +482,42 @@ pub fn metadata(&self) -> io::Result<Metadata> {
self
.inner
.file_attr
()
.map
(
Metadata
)
}
/// Creates a new independently owned handle to the underlying file.
///
/// The returned `File` is a reference to the same state that this object
/// references. Both handles will read and write with the same cursor
/// position.
/// Create a new `File` instance that shares the same underlying file handle
/// as the existing `File` instance. Reads, writes, and seeks will affect
/// both `File` instances simultaneously.
///
/// # Examples
///
/// Create two handles for a file named `foo.txt`:
///
/// ```no_run
/// use std::fs::File;
///
/// # fn foo() -> std::io::Result<()> {
/// let mut f = File::open("foo.txt")?;
/// let file_copy = f.try_clone()?;
/// let mut file = File::open("foo.txt")?;
/// let file_copy = file.try_clone()?;
/// # Ok(())
/// # }
/// ```
///
/// Assuming there’s a file named `foo.txt` with contents `abcdef\n`, create
/// two handles, seek one of them, and read the remaining bytes from the
/// other handle:
///
/// ```no_run
/// use std::fs::File;
/// use std::io::SeekFrom;
/// use std::io::prelude::*;
///
/// # fn foo() -> std::io::Result<()> {
/// let mut file = File::open("foo.txt")?;
/// let mut file_copy = file.try_clone()?;
///
/// file.seek(SeekFrom::Start(3))?;
///
/// let mut contents = vec![];
/// file_copy.read_to_end(&mut contents)?;
/// assert_eq!(contents, b"def\n");
/// # Ok(())
/// # }
/// ```
...
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