Merge branch 'f-cpp-to-string' into f-mixed-write-transactions

include/ccaosdb.h

@@ -412,6 +412,7 @@ int caosdb_entity_parent_get_description(caosdb_entity_parent *parent, char **ou
 int caosdb_entity_message_get_code(caosdb_entity_message *message, int *out);
 int caosdb_entity_message_get_description(caosdb_entity_message *message, char **out);
 
+int caosdb_entity_datatype_is_undefined(caosdb_entity_datatype *datatype, bool *out);
 int caosdb_entity_datatype_is_atomic(caosdb_entity_datatype *datatype, bool *out);
 int caosdb_entity_datatype_is_reference(caosdb_entity_datatype *datatype, bool *out);
 int caosdb_entity_datatype_is_list_of_atomic(caosdb_entity_datatype *datatype, bool *out);

src/ccaosdb.cpp

@@ -991,6 +991,14 @@ ERROR_RETURN_CODE(
     return 0;
   })
 
+ERROR_RETURN_CODE(GENERIC_ERROR,
+                  int caosdb_entity_datatype_is_undefined(caosdb_entity_datatype *datatype,
+                                                          bool *out),
+                  {
+                    auto *wrapped_datatype = WRAPPED_DATATYPE_CAST(datatype);
+                    *out = wrapped_datatype->IsUndefined();
+                    return 0;
+                  })
 ERROR_RETURN_CODE(GENERIC_ERROR,
                   int caosdb_entity_datatype_is_atomic(caosdb_entity_datatype *datatype, bool *out),
                   {

test/test_ccaosdb.cpp

@@ -150,6 +150,9 @@ TEST_F(test_ccaosdb, test_datatype) {
   EXPECT_EQ(return_code, 0);
 
   bool is_a(false);
+  return_code = caosdb_entity_datatype_is_undefined(&atomic, &is_a);
+  EXPECT_EQ(return_code, 0);
+  EXPECT_FALSE(is_a);
   return_code = caosdb_entity_datatype_is_atomic(&atomic, &is_a);
   EXPECT_EQ(return_code, 0);
   EXPECT_TRUE(is_a);