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iter: replace comment with a docstring

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This commit is contained in:
Daniel Micay 2013-09-14 16:34:32 -04:00
parent 561f1b0063
commit 10c8978edb
1 changed files with 3 additions and 5 deletions
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8
src/libstd/iter.rs
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@ -1749,14 +1749,12 @@ impl<A: Add<A, A> + Ord + Clone> Iterator<A> for Range<A> {
// Blocked on #8605 Need numeric trait for converting to `Option<uint>`
}
impl<A: Sub<A, A> + Integer + Ord + Clone> DoubleEndedIterator<A> for Range<A> {
/// `Integer` is required to ensure the range will be the same regardless of
/// the direction it is consumed.
impl<A: Integer + Ord + Clone> DoubleEndedIterator<A> for Range<A> {
#[inline]
fn next_back(&mut self) -> Option<A> {
if self.stop > self.state {
// Integer doesn't technically define this rule, but we're going to assume that every
// Integer is reachable from every other one by adding or subtracting enough Ones. This
// seems like a reasonable-enough rule that every Integer should conform to, even if it
// can't be statically checked.
self.stop = self.stop - self.one;
Some(self.stop.clone())
} else {