including algorithm.h

Author: tanneberger

include/reactor-cpp/graph.hh

@@ -9,6 +9,7 @@
 #ifndef REACTOR_CPP_GRAPH_HH
 #define REACTOR_CPP_GRAPH_HH
 
+#include <algorithm>
 #include <iostream>
 #include <map>
 #include <optional>
@@ -309,4 +310,4 @@ public:
   }
 };
 } // namespace reactor
-#endif // REACTOR_CPP_GRAPH_HH
+#endif // REACTOR_CPP_GRAPH_HH