1 files changed, 43 insertions, 0 deletions
diff --git a/runtimes/libs/misc/include/misc/polymorphic_downcast.h b/runtimes/libs/misc/include/misc/polymorphic_downcast.h
new file mode 100644
index 000000000..ee885eb70
--- /dev/null
+++ b/runtimes/libs/misc/include/misc/polymorphic_downcast.h
@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2019 Samsung Electronics Co., Ltd. All Rights Reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __NNFW_MISC_POLYMORPHIC_DOWNCAST_H__
+#define __NNFW_MISC_POLYMORPHIC_DOWNCAST_H__
+
+#include <cassert>
+#include <memory>
+
+namespace nnfw
+{
+namespace misc
+{
+
+template <typename DstType, typename SrcType> inline DstType polymorphic_downcast(SrcType *x)
+{
+  assert(dynamic_cast<DstType>(x) == x);
+  return static_cast<DstType>(x);
+}
+
+template <typename DstType, typename SrcType> inline DstType polymorphic_downcast(SrcType &x)
+{
+  assert(std::addressof(dynamic_cast<DstType>(x)) == std::addressof(x));
+  return static_cast<DstType>(x);
+}
+
+} // namespace misc
+} // namespace nnfw
+
+#endif // __NNFW_MISC_POLYMORPHIC_DOWNCAST_H__