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#![unstable(feature = "collections_range",
reason = "waiting for dust to settle on inclusive ranges",
issue = "30877")]
use core::ops::{RangeFull, Range, RangeTo, RangeFrom};
use Bound::{self, Excluded, Included, Unbounded};
pub trait RangeArgument<T: ?Sized> {
fn start(&self) -> Bound<&T>;
fn end(&self) -> Bound<&T>;
}
impl<T: ?Sized> RangeArgument<T> for RangeFull {
fn start(&self) -> Bound<&T> {
Unbounded
}
fn end(&self) -> Bound<&T> {
Unbounded
}
}
impl<T> RangeArgument<T> for RangeFrom<T> {
fn start(&self) -> Bound<&T> {
Included(&self.start)
}
fn end(&self) -> Bound<&T> {
Unbounded
}
}
impl<T> RangeArgument<T> for RangeTo<T> {
fn start(&self) -> Bound<&T> {
Unbounded
}
fn end(&self) -> Bound<&T> {
Excluded(&self.end)
}
}
impl<T> RangeArgument<T> for Range<T> {
fn start(&self) -> Bound<&T> {
Included(&self.start)
}
fn end(&self) -> Bound<&T> {
Excluded(&self.end)
}
}
impl<T> RangeArgument<T> for (Bound<T>, Bound<T>) {
fn start(&self) -> Bound<&T> {
match *self {
(Included(ref start), _) => Included(start),
(Excluded(ref start), _) => Excluded(start),
(Unbounded, _) => Unbounded,
}
}
fn end(&self) -> Bound<&T> {
match *self {
(_, Included(ref end)) => Included(end),
(_, Excluded(ref end)) => Excluded(end),
(_, Unbounded) => Unbounded,
}
}
}
impl<'a, T: ?Sized + 'a> RangeArgument<T> for (Bound<&'a T>, Bound<&'a T>) {
fn start(&self) -> Bound<&T> {
self.0
}
fn end(&self) -> Bound<&T> {
self.1
}
}