Add as_ref and as_mut methods for Bound

Add as_ref and as_mut method for std::ops::range::Bound, patterned off
of the methods of the same name on Option.
This commit is contained in:
Griffin Smith 2020-12-28 11:41:52 -05:00
parent 76aca6659a
commit eb72dc5d40

View File

@ -678,6 +678,29 @@ pub enum Bound<T> {
Unbounded,
}
#[unstable(feature = "bound_as_ref", issue = "80996")]
impl<T> Bound<T> {
/// Converts from `&Bound<T>` to `Bound<&T>`.
#[inline]
pub fn as_ref(&self) -> Bound<&T> {
match *self {
Included(ref x) => Included(x),
Excluded(ref x) => Excluded(x),
Unbounded => Unbounded,
}
}
/// Converts from `&mut Bound<T>` to `Bound<&T>`.
#[inline]
pub fn as_mut(&mut self) -> Bound<&mut T> {
match *self {
Included(ref mut x) => Included(x),
Excluded(ref mut x) => Excluded(x),
Unbounded => Unbounded,
}
}
}
impl<T: Clone> Bound<&T> {
/// Map a `Bound<&T>` to a `Bound<T>` by cloning the contents of the bound.
///