Added compound element filter allowing additive inclusion filters

tests/t00041/.clang-uml

@@ -12,4 +12,6 @@ diagrams:
       namespaces:
         - clanguml::t00041
       context:
-        - clanguml::t00041::RR
+        - clanguml::t00041::RR
+      subclasses:
+        - clanguml::t00041::ns1::N

tests/t00041/t00041.cc

@@ -32,4 +32,15 @@ struct RR : public R {
 struct RRR : public RR {
 };
 
+namespace ns1 {
+struct N {
+};
+
+struct NN : public N {
+};
+
+struct NM : public N {
+};
+}
+
 } // namespace clanguml::t00041

tests/t00041/test_case.h

@@ -55,6 +55,12 @@ TEST_CASE("t00041", "[test-case][class]")
     REQUIRE_THAT(puml, IsAssociation(_A("RR"), _A("E"), "+e"));
     REQUIRE_THAT(puml, IsAssociation(_A("RR"), _A("F"), "+f"));
 
+    REQUIRE_THAT(puml, IsClass(_A("ns1::N")));
+    REQUIRE_THAT(puml, IsClass(_A("ns1::NN")));
+    REQUIRE_THAT(puml, IsClass(_A("ns1::NM")));
+    REQUIRE_THAT(puml, IsBaseClass(_A("ns1::N"), _A("ns1::NN")));
+    REQUIRE_THAT(puml, IsBaseClass(_A("ns1::N"), _A("ns1::NM")));
+
     save_puml(
         "./" + config.output_directory() + "/" + diagram->name + ".puml", puml);
 }