tests/test_track_obj: Fix for clang++

kjellahl · kjellahl · commit 5dadaf2c7b08 · 2019-07-03T18:14:16.000+02:00
clang++ complains if private members are unused, so make them protected.

error: private field 'bar_' is not used [-Werror,-Wunused-private-field]
diff --git a/tests/test_track_obj.cc b/tests/test_track_obj.cc
@@ -21,8 +21,8 @@
 // - Show that a slot with a C++11 lambda expression can be automatically
 //   disconnected when an object derived from sigc::trackable is deleted,
 //   provided sigc::track_obj() is used.
-//   It's shown here as a preparation for deprecating and eventually
-//   deleting the libsigc++ lambda expressions.
+//   It shows that C++11 lambda expressions can replace the libsigc++ lambda
+//   expressions, which have been removed.
 //   See https://bugzilla.gnome.org/show_bug.cgi?id=672555
 // - Test the code example in the documentation in sigc++/adaptors/track_obj.h.
 //
@@ -72,7 +72,8 @@ class Functor1 : public sigc::functor_base
     return (i<0) ? "negative" : ((i>0) ? "positive" : "zero");
   }
 
-private:
+protected:
+  // Don't make it private. clang++ does not like unused private data.
   const bar_group4& bar_;
 };
 
@@ -92,8 +93,10 @@ class Functor2 : public sigc::functor_base
     return result;
   }
 
-private:
+protected:
+  // Don't make it private. clang++ does not like unused private data.
   const bar_group4& bar_;
+private:
   const book& aBook_;
 };
 
