Support checking if obj is a nil ptr

ptr/ptr.go

@@ -71,3 +71,10 @@ func Equal[T comparable](a, b *T) bool {
  }
  return *a == *b
 }
+
+// IsNilPtr checks if the provided object is a nil pointer. This is specially useful when dealing
+// with interfaces that may hold pointers.
+func IsNilPtr(obj any) bool {
+ v := reflect.ValueOf(obj)
+ return v.Kind() == reflect.Ptr && v.IsNil()
+}

ptr/ptr_test.go

@@ -122,3 +122,23 @@ func TestEqual(t *testing.T) {
  t.Errorf("expected false (val != val)")
  }
 }
+
+func TestIsNilPtr(t *testing.T) {
+ var nilIntPointer *int
+ testCases := []struct {
+ obj interface{}
+ expected bool
+ }{
+ {(*struct{})(nil), true},
+ {&struct{}{}, false},
+ {nilIntPointer, true},
+ }
+ for i, tc := range testCases {
+ name := fmt.Sprintf("case[%d]", i)
+ t.Run(name, func(t *testing.T) {
+ if actual := ptr.IsNilPtr(tc.obj); actual != tc.expected {
+ t.Errorf("%s: expected %t, got %t", name, tc.expected, actual)
+ }
+ })
+ }
+}