unified method signatures

set.go

@@ -59,9 +59,10 @@ func (s *Set) Insert(uElem uniqueElem, value Num) error {
 	return nil
 }
 
-func (s *Set) SetValue(ID uniqueID.ID, value Num) error {
+func (s *Set) SetValue(elem uniqueElem, value Num) error {
+    elemID := elem.ID()
 	for i, elem := range s.elems {
-		if elem.ID() == ID {
+		if elem.ID() == elemID {
 			elem.value = value
 			//remove elem from array
 			s.elems = append(s.elems[:i], s.elems[i+1:]...)
@@ -70,7 +71,7 @@ func (s *Set) SetValue(ID uniqueID.ID, value Num) error {
 			return nil
 		}
 	}
-	return ErrNoElem{ID}
+	return ErrNoElem{elemID}
 }
 
 func (s *Set) Nearest(value Num) (interface{}, error) {

set_test.go

@@ -120,8 +120,8 @@ func TestSetValue(t *testing.T) {
 		tools.WrapErr(err, "could not insert test element", t)
 	}
 
-	set.SetValue(a.ID(), 3.5)
-	set.SetValue(e.ID(), -2)
+	set.SetValue(a, 3.5)
+	set.SetValue(e, -2)
 
 	tools.Test(set.Elems()[0] == e, "did not correctly change position when set new value", t)
 	tools.Test(set.Elems()[1] == b, "did not correctly change position when set new value", t)