add `IntoBounds` trait

for `range_into_bounds`  feature, #136903

1 files changed, 27 insertions, 1 deletions

diff --git a/library/core/src/range.rs b/library/core/src/range.rs
index 6a62928873f..e94499065ac 100644
--- a/library/core/src/range.rs
+++ b/library/core/src/range.rs
@@ -31,7 +31,9 @@ pub use iter::{IterRange, IterRangeFrom, IterRangeInclusive};
 #[doc(inline)]
 pub use crate::iter::Step;
 #[doc(inline)]
-pub use crate::ops::{Bound, OneSidedRange, RangeBounds, RangeFull, RangeTo, RangeToInclusive};
+pub use crate::ops::{
+    Bound, IntoBounds, OneSidedRange, RangeBounds, RangeFull, RangeTo, RangeToInclusive,
+};
 
 /// A (half-open) range bounded inclusively below and exclusively above
 /// (`start..end` in a future edition).
@@ -175,6 +177,14 @@ impl<T> RangeBounds<T> for Range<&T> {
     }
 }
 
+// #[unstable(feature = "range_into_bounds", issue = "136903")]
+#[unstable(feature = "new_range_api", issue = "125687")]
+impl<T> IntoBounds<T> for Range<T> {
+    fn into_bounds(self) -> (Bound<T>, Bound<T>) {
+        (Included(self.start), Excluded(self.end))
+    }
+}
+
 #[unstable(feature = "new_range_api", issue = "125687")]
 impl<T> From<Range<T>> for legacy::Range<T> {
     #[inline]
@@ -343,6 +353,14 @@ impl<T> RangeBounds<T> for RangeInclusive<&T> {
     }
 }
 
+// #[unstable(feature = "range_into_bounds", issue = "136903")]
+#[unstable(feature = "new_range_api", issue = "125687")]
+impl<T> IntoBounds<T> for RangeInclusive<T> {
+    fn into_bounds(self) -> (Bound<T>, Bound<T>) {
+        (Included(self.start), Included(self.end))
+    }
+}
+
 #[unstable(feature = "new_range_api", issue = "125687")]
 impl<T> From<RangeInclusive<T>> for legacy::RangeInclusive<T> {
     #[inline]
@@ -479,6 +497,14 @@ impl<T> RangeBounds<T> for RangeFrom<&T> {
     }
 }
 
+// #[unstable(feature = "range_into_bounds", issue = "136903")]
+#[unstable(feature = "new_range_api", issue = "125687")]
+impl<T> IntoBounds<T> for RangeFrom<T> {
+    fn into_bounds(self) -> (Bound<T>, Bound<T>) {
+        (Included(self.start), Unbounded)
+    }
+}
+
 #[unstable(feature = "new_range_api", issue = "125687")]
 impl<T> From<RangeFrom<T>> for legacy::RangeFrom<T> {
     #[inline]