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Implement Iter::drain(&mut self) with feature iterator_helper #45168

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Implement Iter::drain(&mut self) with feature iterator_helper #45168

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18 changes: 18 additions & 0 deletions src/libcore/iter/iterator.rs
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Expand Up @@ -1514,6 +1514,24 @@ pub trait Iterator {
false
}

/// Completly consumes an iterator. This is a conveniant method for
/// functional programming with iterators.
///
/// ```
/// let xs = [0, 1, 2, 3];
/// let mut sum = 0;
///
/// xs.iter().map(|x| sum += x).drain();
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This is a more complex way to write xs.iter().sum() or even xs.iter().for_each(|x| sum += x).

/// assert_eq!(6, sum);
/// ```
#[inline]
#[stable(feature = "iterator_helper", since = "1.22.0")]
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It's a minor thing, but to keep it as predictable as possible, iter_methodname or iterator_methodname would be a good feature name. Depends on what the method name will be, of course, just change it with the method name.

fn drain(&mut self) where
Self: Sized
{
self.fold((), |_,_| {});
}

/// Searches for an element of an iterator that satisfies a predicate.
///
/// `find()` takes a closure that returns `true` or `false`. It applies
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