initial implementation

include/xo/reactor/DirectSourcePtr.hpp

@@ -0,0 +1,25 @@
+/* @file DirectSourcePtr.hpp */
+
+#pragma once
+
+#include "reactor/SecondarySource.hpp"
+#include "reactor/LastReducer.hpp"
+#include "reactor/EventTimeFn.hpp"
+
+namespace xo {
+  namespace reactor {
+    template<typename Event>
+    using DirectSource = SecondarySource<Event,
+					 LastReducer<Event,
+						     StructEventTimeFn<Event>>>;
+
+    /* use when Event is ref::rp<T> for some T */
+    template<typename Event>
+    using DirectSourcePtr = SecondarySource<Event,
+					    LastReducer<Event,
+							PtrEventTimeFn<Event>>>;
+
+  } /*namespace reactor*/
+} /*namespace xo*/
+
+/* end DirectSourcePtr.hpp */