refs #403 Add Policy::MetaType::None for base class templates

src/blackmisc/aviation/avionicsbase.h

@@ -14,6 +14,15 @@
 
 namespace BlackMisc
 {
+
+    namespace Aviation { class CAvionicsBase; }
+
+    //! \private
+    template <> struct CValueObjectPolicy<Aviation::CAvionicsBase> : public CValueObjectPolicy<>
+    {
+        using MetaType = Policy::MetaType::None;
+    };
+
     namespace Aviation
     {
 

src/blackmisc/aviation/comsystem.h

@@ -21,6 +21,7 @@ namespace BlackMisc
     //! \private
     template <> struct CValueObjectPolicy<Aviation::CComSystem> : public CValueObjectPolicy<>
     {
+        using MetaType = Policy::MetaType::Default;
         using LessThan = Policy::LessThan::None;
         using Compare = Policy::Compare::None;
         using Hash = Policy::Hash::Own;

src/blackmisc/aviation/transponder.h

@@ -16,6 +16,15 @@
 
 namespace BlackMisc
 {
+
+    namespace Aviation { class CTransponder; }
+
+    //! \private
+    template <> struct CValueObjectPolicy<Aviation::CTransponder> : public CValueObjectPolicy<>
+    {
+        using MetaType = Policy::MetaType::Default;
+    };
+
     namespace Aviation
     {
         //! Transponder