diff --git a/source/mijin/io/stream.hpp b/source/mijin/io/stream.hpp
index 17e8515..f940716 100644
--- a/source/mijin/io/stream.hpp
+++ b/source/mijin/io/stream.hpp
@@ -469,6 +469,34 @@ inline void throwOnError(mijin::StreamError error, std::string message)
     }
     throw std::runtime_error(message + ": " + errorName(error));
 }
+
+template<typename TSuccess>
+inline decltype(auto) throwOnError(StreamResult<TSuccess>&& result)
+{
+    if (result.isError())
+    {
+        throw Exception(errorName(result.getError()));
+    }
+    else if (!result.isSuccess())
+    {
+        throw Exception("result is empty");
+    }
+    return *result;
+}
+
+template<typename TSuccess>
+inline decltype(auto) throwOnError(StreamResult<TSuccess>&& result, const std::string& message)
+{
+    if (result.isError())
+    {
+        throw Exception(message + ": " + errorName(result.getError()));
+    }
+    else if (!result.isSuccess())
+    {
+        throw Exception(message + ": result is empty");
+    }
+    return *result;
+}
 } // namespace mijin
 
 #endif // !defined(MIJIN_IO_STREAM_HPP_INCLUDED)