2 files changed, 59 insertions, 0 deletions
diff --git a/test/Makefile.am b/test/Makefile.am
index 3b474466..fd3252dc 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -25,6 +25,7 @@ noinst_PROGRAMS = \
 	dw-resource-test \
 	dw-ui-test \
 	containers \
+	identity \
 	shapes \
 	cookies \
 	liang \
@@ -191,6 +192,9 @@ shapes_LDADD = \
 containers_SOURCES = containers.cc
 containers_LDADD = $(top_builddir)/lout/liblout.a
 
+identity_SOURCES = identity.cc
+identity_LDADD = $(top_builddir)/lout/liblout.a
+
 cookies_SOURCES = cookies.c
 cookies_LDADD = \
 	$(top_builddir)/dpip/libDpip.a \
diff --git a/test/identity.cc b/test/identity.cc
new file mode 100644
index 00000000..a1a136eb
--- /dev/null
+++ b/test/identity.cc
@@ -0,0 +1,55 @@
+/*
+ * This small program tests how IdentifiableObject works with multiple
+ * inheritance ("diamond" inheritance, more precisely, since all
+ * classes have there root in IdentifiableObject.)
+ *
+ * Current status: With virtual superclasses, you get a class
+ * hierarchie "root -> A -> B -> C", so that the first part of this
+ * example works actually (C is a subclass of A and of B), but the
+ * second fails (it should print "false", but it is erroneously
+ * assumed that B is a subclass of A.)
+ */
+
+#include "../lout/identity.hh"
+
+using namespace lout::identity;
+
+class A: virtual public IdentifiableObject
+{
+public:
+   static int CLASS_ID;
+   inline A () { registerName ("A", &CLASS_ID); }
+};
+
+class B: virtual public IdentifiableObject
+{
+public:
+   static int CLASS_ID;
+   inline B () { registerName ("B", &CLASS_ID); }
+};
+
+class C: public A, public B
+{
+public:
+   static int CLASS_ID;
+   inline C () { registerName ("C", &CLASS_ID); }
+};
+
+int A::CLASS_ID = -1, B::CLASS_ID = -1, C::CLASS_ID = -1;
+
+int main (int argc, char *argv[])
+{
+   printf ("A: %d, B: %d, C: %d\n", A::CLASS_ID, B::CLASS_ID, C::CLASS_ID);
+
+   C x;
+   assert (x.instanceOf (A::CLASS_ID));
+   assert (x.instanceOf (B::CLASS_ID));
+   assert (x.instanceOf (C::CLASS_ID));
+   printf ("x: %d\n", x.getClassId ());
+
+   B y;
+   printf ("y: %d; instance of A: %s\n",
+           y.getClassId (), y.instanceOf (B::CLASS_ID) ? "true" : "false");
+
+   return 0;
+}