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std: Deprecate iter::{Unfold, Iterate}

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Neither of these iterators has seen enough usage to justify their position in
the standard library, so these unstable iterators are being slated for deletion.
This commit is contained in:
Alex Crichton 2015-06-10 18:01:59 -07:00
parent 02a8d5b570
commit 669d1cd9e2
1 changed files with 12 additions and 0 deletions
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12
src/libcore/iter.rs
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@ -2542,6 +2542,9 @@ impl<I: RandomAccessIterator, F> RandomAccessIterator for Inspect<I, F>
/// ```
#[unstable(feature = "iter_unfold")]
#[derive(Clone)]
#[deprecated(since = "1.2.0",
reason = "has gained enough traction to retain its position \
in the standard library")]
pub struct Unfold<St, F> {
f: F,
/// Internal state that will be passed to the closure on the next iteration
@ -2550,6 +2553,9 @@ pub struct Unfold<St, F> {
}
#[unstable(feature = "iter_unfold")]
#[deprecated(since = "1.2.0",
reason = "has gained enough traction to retain its position \
in the standard library")]
impl<A, St, F> Unfold<St, F> where F: FnMut(&mut St) -> Option<A> {
/// Creates a new iterator with the specified closure as the "iterator
/// function" and an initial state to eventually pass to the closure
@ -2995,11 +3001,17 @@ type IterateState<T, F> = (F, Option<T>, bool);
/// An iterator that repeatedly applies a given function, starting
/// from a given seed value.
#[unstable(feature = "iter_iterate")]
#[deprecated(since = "1.2.0",
reason = "has gained enough traction to retain its position \
in the standard library")]
pub type Iterate<T, F> = Unfold<IterateState<T, F>, fn(&mut IterateState<T, F>) -> Option<T>>;
/// Creates a new iterator that produces an infinite sequence of
/// repeated applications of the given function `f`.
#[unstable(feature = "iter_iterate")]
#[deprecated(since = "1.2.0",
reason = "has gained enough traction to retain its position \
in the standard library")]
pub fn iterate<T, F>(seed: T, f: F) -> Iterate<T, F> where
T: Clone,
F: FnMut(T) -> T,