bjoernager/rust
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fix range sugar

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Robin Gloster 2015-01-04 03:40:50 +01:00
parent 496dc4eae7
commit 5cc17382d1
2 changed files with 7 additions and 7 deletions
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12
src/libcore/iter.rs
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@ -2620,10 +2620,10 @@ pub trait Step: Ord {
/// Change self to the previous object. /// Change self to the previous object.
fn step_back(&mut self); fn step_back(&mut self);
/// The steps_between two step objects. /// The steps_between two step objects.
/// a should always be less than b, so the result should never be negative. /// start should always be less than end, so the result should never be negative.
/// Return None if it is not possible to calculate steps_between without /// Return None if it is not possible to calculate steps_between without
/// overflow. /// overflow.
fn steps_between(a: &Self, b: &Self) -> Option<uint>; fn steps_between(start: &Self, end: &Self) -> Option<uint>;
} }
macro_rules! step_impl { macro_rules! step_impl {
@ -2635,9 +2635,9 @@ macro_rules! step_impl {
#[inline] #[inline]
fn step_back(&mut self) { *self -= 1; } fn step_back(&mut self) { *self -= 1; }
#[inline] #[inline]
fn steps_between(a: &$t, b: &$t) -> Option<uint> { fn steps_between(start: &$t, end: &$t) -> Option<uint> {
debug_assert!(a < b); debug_assert!(end >= start);
Some((*a - *b) as uint) Some((*end - *start) as uint)
} }
} }
)*) )*)
@ -2652,7 +2652,7 @@ macro_rules! step_impl_no_between {
#[inline] #[inline]
fn step_back(&mut self) { *self -= 1; } fn step_back(&mut self) { *self -= 1; }
#[inline] #[inline]
fn steps_between(_a: &$t, _b: &$t) -> Option<uint> { fn steps_between(_start: &$t, _end: &$t) -> Option<uint> {
None None
} }
} }

2
src/libcore/ops.rs
View file

@ -803,7 +803,7 @@ impl<Idx: Clone + Step> Iterator<Idx> for Range<Idx> {
#[inline] #[inline]
fn size_hint(&self) -> (uint, Option<uint>) { fn size_hint(&self) -> (uint, Option<uint>) {
if let Some(hint) = Step::steps_between(&self.end, &self.start) { if let Some(hint) = Step::steps_between(&self.start, &self.end) {
(hint, Some(hint)) (hint, Some(hint))
} else { } else {
(0, None) (0, None)