diff --git a/huagao/MapFinder.h b/huagao/MapFinder.h
new file mode 100644
index 00000000..a051078d
--- /dev/null
+++ b/huagao/MapFinder.h
@@ -0,0 +1,16 @@
+#pragma once
+#include <algorithm>
+template<typename MapType>
+auto get_map_key_by_value(const MapType& input_map, const decltype(input_map.begin()->second)& mapped_value) -> decltype(input_map.begin()->first)
+{
+	auto iter = std::find_if(input_map.begin(), input_map.end(), [mapped_value](const auto& item) {
+		return (item.second == mapped_value);
+	});
+
+	if (iter == input_map.end())
+	{
+		return decltype(input_map.begin()->first)();
+	}
+	return iter->first;
+}
+