changed: add helper template to serialize and broadcast static types

ebos/eclmpiserializer.hh

@@ -27,7 +27,7 @@ namespace Opm {
 
 class EclMpiSerializer {
 public:
-    EclMpiSerializer(Dune::MPIHelper::MPICommunicator comm) :
+    EclMpiSerializer(Dune::CollectiveCommunication<Dune::MPIHelper::MPICommunicator> comm) :
         m_comm(comm)
     {}
 
@@ -46,8 +46,33 @@ public:
         Mpi::unpack(data, buffer, pos, m_comm);
     }
 
+    template<class T>
+    void staticBroadcast()
+    {
+        if (m_comm.size() == 1)
+            return;
+
+#if HAVE_MPI
+        if (m_comm.rank() == 0) {
+            size_t size = T::packSize(*this);
+            std::vector<char> buffer(size);
+            int position = 0;
+            T::pack(buffer, position, *this);
+            m_comm.broadcast(&position, 1, 0);
+            m_comm.broadcast(buffer.data(), position, 0);
+        } else {
+            int size;
+            m_comm.broadcast(&size, 1, 0);
+            std::vector<char> buffer(size);
+            m_comm.broadcast(buffer.data(), size, 0);
+            int position = 0;
+            T::unpack(buffer, position, *this);
+        }
+#endif
+    }
+
 protected:
-    Dune::MPIHelper::MPICommunicator m_comm;
+    Dune::CollectiveCommunication<Dune::MPIHelper::MPICommunicator> m_comm;
 };
 
 }