implement IkarusPropertySource and switch to cppbase::overloaded

Signed-off-by: Folling <mail@folling.io>

src/objects/properties/property_source.cpp

@@ -0,0 +1,46 @@
+#include "property_source.hpp"
+
+#include <boost/functional/overloaded_function.hpp>
+
+#include <objects/blueprint.hpp>
+
+IkarusPropertySource::IkarusPropertySource(Data data):
+    data{data} {}
+
+IkarusPropertySource * ikarus_property_source_create_blueprint(IkarusBlueprint * blueprint) {
+    return new IkarusPropertySource{blueprint};
+}
+
+IkarusPropertySource * ikarus_property_source_create_entity(IkarusEntity * entity) {
+    return new IkarusPropertySource{entity};
+}
+
+void ikarus_property_source_visit(
+    struct IkarusPropertySource * property_source,
+    void (*blueprint_visitor)(struct IkarusBlueprint *, void *),
+    void (*entity_visitor)(struct IkarusEntity *, void *),
+    void * user_data
+) {
+    boost::variant2::visit(
+        boost::make_overloaded_function(
+            [blueprint_visitor, user_data](IkarusBlueprint * blueprint) { blueprint_visitor(blueprint, user_data); },
+            [entity_visitor, user_data](IkarusEntity * entity) { entity_visitor(entity, user_data); }
+        ),
+        property_source->data
+    );
+}
+
+void ikarus_property_source_visit_const(
+    struct IkarusPropertySource const * property_source,
+    void (*blueprint_visitor)(struct IkarusBlueprint const *, void *),
+    void (*entity_visitor)(struct IkarusEntity const *, void *),
+    void * user_data
+) {
+    boost::variant2::visit(
+        boost::make_overloaded_function(
+            [blueprint_visitor, user_data](IkarusBlueprint const * blueprint) { blueprint_visitor(blueprint, user_data); },
+            [entity_visitor, user_data](IkarusEntity const * entity) { entity_visitor(entity, user_data); }
+        ),
+        property_source->data
+    );
+}