1 files changed, 24 insertions, 0 deletions
diff --git a/src/support/type/filter.h b/src/support/type/filter.h
new file mode 100644
index 0000000..4a0e19f
--- /dev/null
+++ b/src/support/type/filter.h
@@ -0,0 +1,24 @@
+#ifndef INPUTXSLT_SRC_SUPPORT_TYPE_FILTER_H_
+#define INPUTXSLT_SRC_SUPPORT_TYPE_FILTER_H_
+
+#include <tuple>
+#include <type_traits>
+
+namespace InputXSLT {
+
+template <
+	typename BaseReference,
+	typename Head,
+	typename... Tail
+>
+struct filter_derived {
+	typedef typename std::conditional<
+		std::is_base_of<BaseReference, Head>::value,
+		std::tuple<Head, Tail...>,
+		std::tuple<Tail...>
+	>::type type;
+};
+
+}
+
+#endif  // INPUTXSLT_SRC_SUPPORT_TYPE_FILTER_H_