.

wcfs/internal/xbtree/rangeset.go

@@ -36,12 +36,12 @@ type RangeSet struct {
 	rangev []Range // lo↑
 }
 
-// Add adds Range r to the set of keys.
+// Add adds Range r to the set of keys.		// XXX -> UnionInplace1 ?
 func (S *RangeSet) Add(r Range) {
 	panic("TODO")	// XXX
 }
 
-// Del removes Range r from the set of keys.
+// Del removes Range r from the set of keys.	// XXX -> DifferenceInplace1 ?
 func (S *RangeSet) Del(r Range) {
 	panic("TODO")	// XXX
 }
@@ -70,6 +70,28 @@ func (A *RangeSet) Difference(B *RangeSet) *RangeSet {
 
 // XXX Intersection
 
+func (A *RangeSet) UnionInplace(B *RangeSet) {
+	A.verify()
+	B.verify()
+	defer A.verify()
+
+	// XXX dumb
+	for _, r := range B.rangev {
+		A.Add(r)
+	}
+}
+
+func (A *RangeSet) DifferenceInplace(B *RangeSet) {
+	A.verify()
+	B.verify()
+	defer A.verify()
+
+	// XXX dumb
+	for _, r := range B.rangev {
+		A.Del(r)
+	}
+}
+
 
 // --------