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Add internal accessor methods to io::{Chain, Take}.

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Resolves #29067.
This commit is contained in:
Sergio Benitez 2017-04-22 01:14:18 -07:00
parent 63c77214c1
commit a765dcaf53
1 changed files with 131 additions and 0 deletions
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131
src/libstd/io/mod.rs
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@ -1494,6 +1494,83 @@ pub struct Chain<T, U> {
done_first: bool,
}
impl<T, U> Chain<T, U> {
/// Consumes the `Chain`, returning the wrapped readers.
///
/// # Examples
///
/// ```
/// #![feature(more_io_inner_methods)]
///
/// # use std::io;
/// use std::io::prelude::*;
/// use std::fs::File;
///
/// # fn foo() -> io::Result<()> {
/// let mut foo_file = File::open("foo.txt")?;
/// let mut bar_file = File::open("bar.txt")?;
///
/// let chain = foo_file.chain(bar_file);
/// let (foo_file, bar_file) = chain.into_inner();
/// # Ok(())
/// # }
/// ```
#[unstable(feature = "more_io_inner_methods", issue="0")]
pub fn into_inner(self) -> (T, U) {
(self.first, self.second)
}
/// Gets references to the underlying readers in this `Chain`.
///
/// # Examples
///
/// ```
/// #![feature(more_io_inner_methods)]
///
/// # use std::io;
/// use std::io::prelude::*;
/// use std::fs::File;
///
/// # fn foo() -> io::Result<()> {
/// let mut foo_file = File::open("foo.txt")?;
/// let mut bar_file = File::open("bar.txt")?;
///
/// let chain = foo_file.chain(bar_file);
/// let (foo_file, bar_file) = chain.get_ref();
/// # Ok(())
/// # }
/// ```
#[unstable(feature = "more_io_inner_methods", issue="0")]
pub fn get_ref(&self) -> (&T, &U) {
(&self.first, &self.second)
}
/// Gets mutable references to the underlying readers in this `Chain`.
///
/// # Examples
///
/// ```
/// #![feature(more_io_inner_methods)]
///
/// # use std::io;
/// use std::io::prelude::*;
/// use std::fs::File;
///
/// # fn foo() -> io::Result<()> {
/// let mut foo_file = File::open("foo.txt")?;
/// let mut bar_file = File::open("bar.txt")?;
///
/// let mut chain = foo_file.chain(bar_file);
/// let (foo_file, bar_file) = chain.get_mut();
/// # Ok(())
/// # }
/// ```
#[unstable(feature = "more_io_inner_methods", issue="0")]
pub fn get_mut(&mut self) -> (&mut T, &mut U) {
(&mut self.first, &mut self.second)
}
}
#[stable(feature = "std_debug", since = "1.16.0")]
impl<T: fmt::Debug, U: fmt::Debug> fmt::Debug for Chain<T, U> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
@ -1606,6 +1683,60 @@ impl<T> Take<T> {
pub fn into_inner(self) -> T {
self.inner
}
/// Gets a reference to the underlying reader.
///
/// # Examples
///
/// ```
/// #![feature(more_io_inner_methods)]
///
/// use std::io;
/// use std::io::prelude::*;
/// use std::fs::File;
///
/// # fn foo() -> io::Result<()> {
/// let mut file = File::open("foo.txt")?;
///
/// let mut buffer = [0; 5];
/// let mut handle = file.take(5);
/// handle.read(&mut buffer)?;
///
/// let file = handle.get_ref();
/// # Ok(())
/// # }
/// ```
#[unstable(feature = "more_io_inner_methods", issue="0")]
pub fn get_ref(&self) -> &T {
&self.inner
}
/// Gets a mutable reference to the underlying reader.
///
/// # Examples
///
/// ```
/// #![feature(more_io_inner_methods)]
///
/// use std::io;
/// use std::io::prelude::*;
/// use std::fs::File;
///
/// # fn foo() -> io::Result<()> {
/// let mut file = File::open("foo.txt")?;
///
/// let mut buffer = [0; 5];
/// let mut handle = file.take(5);
/// handle.read(&mut buffer)?;
///
/// let file = handle.get_mut();
/// # Ok(())
/// # }
/// ```
#[unstable(feature = "more_io_inner_methods", issue="0")]
pub fn get_mut(&mut self) -> &mut T {
&mut self.inner
}
}
#[stable(feature = "rust1", since = "1.0.0")]