Added a variant of throwOnError that takes an additional error message.

source/mijin/io/stream.hpp

@@ -11,6 +11,7 @@
 #include <span>
 #include <string>
 #include "../container/typeless_buffer.hpp"
+#include "../util/exception.hpp"
 
 namespace mijin
 {
@@ -282,6 +283,14 @@ inline void throwOnError(mijin::StreamError error)
     }
     throw std::runtime_error(errorName(error));
 }
+
+inline void throwOnError(mijin::StreamError error, std::string message)
+{
+    if (error == mijin::StreamError::SUCCESS) {
+        return;
+    }
+    throw std::runtime_error(message + ": " + errorName(error));
+}
 } // namespace mijin
 
 #endif // !defined(MIJIN_IO_STREAM_HPP_INCLUDED)