Rollup merge of #44668 - iwillspeak:into-iterator-docs, r=steveklabnik

Add Example of `IntoIterator` as Trait Bound to Docs

Part of #44600.
This commit is contained in:
Alex Crichton 2017-09-18 11:04:27 -05:00 committed by GitHub
commit 4af3073c71

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@ -196,6 +196,23 @@ pub trait FromIterator<A>: Sized {
/// assert_eq!(i as i32, n);
/// }
/// ```
///
/// It is common to use `IntoIterator` as a trait bound. This allows
/// the input collection type to change, so long as it is still an
/// iterator. Additional bounds can be specified by restricting on
/// `Item`:
///
/// ```rust
/// fn collect_as_strings<T>(collection: T) -> Vec<String>
/// where T: IntoIterator,
/// T::Item : std::fmt::Debug,
/// {
/// collection
/// .into_iter()
/// .map(|item| format!("{:?}", item))
/// .collect()
/// }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub trait IntoIterator {
/// The type of the elements being iterated over.