diff --git a/include/spinscale/multiOperationResultSet.h b/include/spinscale/multiOperationResultSet.h
new file mode 100644
index 0000000..02965c0
--- /dev/null
+++ b/include/spinscale/multiOperationResultSet.h
@@ -0,0 +1,29 @@
+#ifndef MULTI_OPERATION_RESULT_SET_H
+#define MULTI_OPERATION_RESULT_SET_H
+
+namespace sscl {
+
+/** Plain aggregate for fan-out / fan-in results returned from coroutines. */
+struct MultiOperationResultSet
+{
+	MultiOperationResultSet(
+		unsigned int total = 0,
+		unsigned int succeeded = 0,
+		unsigned int failed = 0)
+	: nTotal(total), nSucceeded(succeeded), nFailed(failed)
+	{}
+
+	bool isComplete() const
+		{ return nSucceeded + nFailed == nTotal; }
+
+	bool nTotalIsZero() const
+		{ return nTotal == 0; }
+
+	unsigned int nTotal;
+	unsigned int nSucceeded;
+	unsigned int nFailed;
+};
+
+} // namespace sscl
+
+#endif // MULTI_OPERATION_RESULT_SET_H