add rttr::type::get_direct_base_classes()

src/rttr/detail/registration/registration_impl.h

@@ -115,7 +115,7 @@ template<typename Class_Type, typename Visitor_List>
 registration::class_<Class_Type, Visitor_List>::~class_()
 {
     // make sure that all base classes are registered
-    detail::base_classes<Class_Type>::get_types();
+    detail::base_classes<Class_Type>::get_types(true);
 }
 
 /////////////////////////////////////////////////////////////////////////////////////////

src/rttr/detail/type/base_classes.h

@@ -82,7 +82,7 @@ struct RTTR_LOCAL type_from_base_classes;
 template<typename DerivedClass>
 struct RTTR_LOCAL type_from_base_classes<DerivedClass>
 {
-    static RTTR_INLINE void fill(info_container&)
+    static RTTR_INLINE void fill(info_container&, bool)
     {
     }
 };
@@ -105,15 +105,25 @@ static void* rttr_cast_impl(void* ptr)
 template<typename DerivedClass, typename BaseClass, typename... U>
 struct RTTR_LOCAL type_from_base_classes<DerivedClass, BaseClass, U...>
 {
-    static RTTR_INLINE void fill(info_container& vec)
+    static RTTR_INLINE void fill(info_container& vec, bool do_all_bases)
     {
         static_assert(has_base_class_list<BaseClass>::value, "The parent class has no base class list defined - please use the macro RTTR_ENABLE");
-        vec.emplace_back(type::get<BaseClass>(), &rttr_cast_impl<DerivedClass, BaseClass>);
-        // retrieve also the types of all base classes of the base classes; you will get an compile error here,
-        // when the base class has not defined the 'base_class_list' typedef
-        type_from_base_classes<DerivedClass, typename BaseClass::base_class_list>::fill(vec);
-        // continue with the rest
-        type_from_base_classes<DerivedClass, U...>::fill(vec);
+
+        // put away pair of "type" and cast to type
+        vec.emplace_back(
+                type::get<BaseClass>(),
+                &rttr_cast_impl<DerivedClass, BaseClass>
+                );
+
+        if ( do_all_bases ) {
+
+            // retrieve also the types of all base classes of the base classes; you will get an compile error here,
+            // when the base class has not defined the 'base_class_list' typedef
+            type_from_base_classes<DerivedClass, typename BaseClass::base_class_list>::fill(vec, do_all_bases);
+        }
+
+        // continue with the rest of the bases in struct
+        type_from_base_classes<DerivedClass, U...>::fill(vec, do_all_bases);
     }
 };
 
@@ -127,7 +137,7 @@ struct type_from_base_classes<DerivedClass, type_list<BaseClassList...>> : type_
 template<typename T, typename Enable = void>
 struct RTTR_LOCAL base_classes
 {
-    static RTTR_INLINE info_container get_types()
+    static RTTR_INLINE info_container get_types(bool)
     {
         info_container result;
         return result;
@@ -137,10 +147,10 @@ struct RTTR_LOCAL base_classes
 template<typename T>
 struct RTTR_LOCAL base_classes<T, typename std::enable_if<has_base_class_list<T>::value>::type>
 {
-    static RTTR_INLINE info_container get_types()
+    static RTTR_INLINE info_container get_types(bool do_all_bases)
     {
         info_container result;
-        type_from_base_classes<T, typename T::base_class_list>::fill(result);
+        type_from_base_classes<T, typename T::base_class_list>::fill(result, do_all_bases);
         return result;
     }
 };

src/rttr/detail/type/type_register.cpp

@@ -505,7 +505,7 @@ type_data* type_register_private::register_name_if_neccessary(type_data* info)
 
 void type_register_private::register_base_class_info(type_data* info)
 {
-    auto base_classes = info->get_base_types();
+    auto base_classes(info->get_base_types(true));
 
     // remove double entries; can only be happen for virtual inheritance case
     set<type> double_entries;
@@ -529,9 +529,9 @@ void type_register_private::register_base_class_info(type_data* info)
 
     if (!base_classes.empty())
     {
-        auto& class_data = info->m_class_data;
         for (const auto& t : base_classes)
         {
+            auto& class_data = info->m_class_data;
             class_data.m_base_types.push_back(t.m_base_type);
             class_data.m_conversion_list.push_back(t.m_rttr_cast_func);
 
@@ -546,7 +546,7 @@ void type_register_private::register_base_class_info(type_data* info)
 type_data* type_register_private::register_type(type_data* info) RTTR_NOEXCEPT
 {
     // this will register the base types
-    info->get_base_types();
+    info->get_base_types(true);
 
     using namespace detail;
 

src/rttr/type.cpp

@@ -161,6 +161,17 @@ array_range<type> type::get_base_classes() const RTTR_NOEXCEPT
 
 /////////////////////////////////////////////////////////////////////////////////////////
 
+std::vector<type> type::get_direct_base_classes() const RTTR_NOEXCEPT
+{
+    std::vector<type> db_vec;
+    for ( auto&& t : m_type_data->get_base_types(false) ) {
+        db_vec.emplace_back(t.m_base_type); // transform...
+    }
+    return db_vec;
+}
+
+/////////////////////////////////////////////////////////////////////////////////////////
+
 array_range<type> type::get_derived_classes() const RTTR_NOEXCEPT
 {
     return array_range<type>(m_type_data->m_class_data.m_derived_types.data(),

src/rttr/type.h

@@ -573,6 +573,13 @@ class RTTR_API type
          */
         array_range<type> get_base_classes() const RTTR_NOEXCEPT;
 
+        /*!
+         * \brief Returns a range of direct base classes of this type in order declarad in RTTR_ENABLE.
+         *
+         * \return A range of types.
+         */
+        std::vector<type> get_direct_base_classes() const RTTR_NOEXCEPT;
+
         /*!
          * \brief Returns a range of all derived classes of this type.
          *

src/unit_tests/type/test_type.cpp

@@ -287,6 +287,17 @@ TEST_CASE("type - get_base_classes()", "[type]")
     REQUIRE(base_list[2] == type::get<DiamondRight>());
 }
 
+TEST_CASE("type - get_direct_base_classes()", "[type]")
+{
+    DiamondBottom d;
+    const auto& base_list_range = type::get(d).get_direct_base_classes();
+    REQUIRE(base_list_range.size() == 2);
+
+    std::vector<type> base_list(base_list_range.cbegin(), base_list_range.cend());
+    REQUIRE(base_list[0] == type::get<DiamondLeft>());
+    REQUIRE(base_list[1] == type::get<DiamondRight>());
+}
+
 /////////////////////////////////////////////////////////////////////////////////////////
 
 TEST_CASE("type - is_base_of()", "[type]")