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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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25
src/libcore/str/mod.rs
View file

@ -23,7 +23,7 @@ use convert::AsRef;
use default::Default;
use fmt;
use iter::ExactSizeIterator;
use iter::{Map, Cloned, Iterator, DoubleEndedIterator};
use iter::{Map, Cloned, Iterator, DoubleEndedIterator, FusedIterator};
use marker::Sized;
use mem;
use ops::{Fn, FnMut, FnOnce};
@ -454,6 +454,9 @@ impl<'a> DoubleEndedIterator for Chars<'a> {
}
}
#[unstable(feature = "fused", issue = "35602")]
impl<'a> FusedIterator for Chars<'a> {}
impl<'a> Chars<'a> {
/// View the underlying data as a subslice of the original data.
///
@ -525,6 +528,9 @@ impl<'a> DoubleEndedIterator for CharIndices<'a> {
}
}
#[unstable(feature = "fused", issue = "35602")]
impl<'a> FusedIterator for CharIndices<'a> {}
impl<'a> CharIndices<'a> {
/// View the underlying data as a subslice of the original data.
///
@ -593,6 +599,9 @@ impl<'a> ExactSizeIterator for Bytes<'a> {
}
}
#[unstable(feature = "fused", issue = "35602")]
impl<'a> FusedIterator for Bytes<'a> {}
/// This macro generates a Clone impl for string pattern API
/// wrapper types of the form X<'a, P>
macro_rules! derive_pattern_clone {
@ -739,6 +748,13 @@ macro_rules! generate_pattern_iterators {
}
}
#[unstable(feature = "fused", issue = "35602")]
impl<'a, P: Pattern<'a>> FusedIterator for $forward_iterator<'a, P> {}
#[unstable(feature = "fused", issue = "35602")]
impl<'a, P: Pattern<'a>> FusedIterator for $reverse_iterator<'a, P>
where P::Searcher: ReverseSearcher<'a> {}
generate_pattern_iterators!($($t)* with $(#[$common_stability_attribute])*,
$forward_iterator,
$reverse_iterator, $iterty);
@ -1088,6 +1104,9 @@ impl<'a> DoubleEndedIterator for Lines<'a> {
}
}
#[unstable(feature = "fused", issue = "35602")]
impl<'a> FusedIterator for Lines<'a> {}
/// Created with the method [`lines_any()`].
///
/// [`lines_any()`]: ../../std/primitive.str.html#method.lines_any
@ -1151,6 +1170,10 @@ impl<'a> DoubleEndedIterator for LinesAny<'a> {
}
}
#[unstable(feature = "fused", issue = "35602")]
#[allow(deprecated)]
impl<'a> FusedIterator for LinesAny<'a> {}
/*
Section: Comparing strings
*/