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Add a FusedIterator trait.

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This trait can be used to avoid the overhead of a fuse wrapper when an iterator
is already well-behaved.

Conforming to: RFC 1581
Closes: #35602
This commit is contained in:
Steven Allen
2016-08-13 14:42:36 -04:00
parent 43c090ed69
commit de91872a33
29 changed files with 437 additions and 24 deletions
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24
src/libcore/iter/range.rs
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@@ -16,7 +16,7 @@ use option::Option::{self, Some, None};
use marker::Sized;
use usize;
use super::{DoubleEndedIterator, ExactSizeIterator, Iterator};
use super::{DoubleEndedIterator, ExactSizeIterator, Iterator, FusedIterator};
/// Objects that can be stepped over in both directions.
///
@@ -364,6 +364,10 @@ impl<A> Iterator for StepBy<A, ops::RangeFrom<A>> where
}
}
#[unstable(feature = "fused", issue = "35602")]
impl<A> FusedIterator for StepBy<A, ops::RangeFrom<A>>
where A: Clone, for<'a> &'a A: Add<&'a A, Output = A> {}
#[stable(feature = "rust1", since = "1.0.0")]
impl<A: Step + Clone> Iterator for StepBy<A, ops::Range<A>> {
type Item = A;
@@ -401,6 +405,9 @@ impl<A: Step + Clone> Iterator for StepBy<A, ops::Range<A>> {
}
}
#[unstable(feature = "fused", issue = "35602")]
impl<A: Step + Clone> FusedIterator for StepBy<A, ops::Range<A>> {}
#[unstable(feature = "inclusive_range",
reason = "recently added, follows RFC",
issue = "28237")]
@@ -468,6 +475,9 @@ impl<A: Step + Clone> Iterator for StepBy<A, ops::RangeInclusive<A>> {
}
}
#[unstable(feature = "fused", issue = "35602")]
impl<A: Step + Clone> FusedIterator for StepBy<A, ops::RangeInclusive<A>> {}
macro_rules! range_exact_iter_impl {
($($t:ty)*) => ($(
#[stable(feature = "rust1", since = "1.0.0")]
@@ -526,6 +536,10 @@ impl<A: Step + Clone> DoubleEndedIterator for ops::Range<A> where
}
}
#[unstable(feature = "fused", issue = "35602")]
impl<A> FusedIterator for ops::Range<A>
where A: Step, for<'a> &'a A: Add<&'a A, Output = A> {}
#[stable(feature = "rust1", since = "1.0.0")]
impl<A: Step> Iterator for ops::RangeFrom<A> where
for<'a> &'a A: Add<&'a A, Output = A>
@@ -540,6 +554,10 @@ impl<A: Step> Iterator for ops::RangeFrom<A> where
}
}
#[unstable(feature = "fused", issue = "35602")]
impl<A> FusedIterator for ops::RangeFrom<A>
where A: Step, for<'a> &'a A: Add<&'a A, Output = A> {}
#[unstable(feature = "inclusive_range", reason = "recently added, follows RFC", issue = "28237")]
impl<A: Step> Iterator for ops::RangeInclusive<A> where
for<'a> &'a A: Add<&'a A, Output = A>
@@ -638,3 +656,7 @@ impl<A: Step> DoubleEndedIterator for ops::RangeInclusive<A> where
n
}
}
#[unstable(feature = "fused", issue = "35602")]
impl<A> FusedIterator for ops::RangeInclusive<A>
where A: Step, for<'a> &'a A: Add<&'a A, Output = A> {}