Add broadcast of single integer value

src/utils/Messenger.cpp

@@ -51,7 +51,6 @@ Messenger::
 #endif // PASTIS_HAS_MPI
 }
 
-
 void Messenger::barrier() const
 {
 #ifdef PASTIS_HAS_MPI
@@ -59,11 +58,19 @@ void Messenger::barrier() const
 #endif // PASTIS_HAS_MPI
 }
 
+int Messenger::
+_broadcast(int& data, int root_rank) const
+{
+  MPI_Bcast(&data, 1,  MPI_INT, root_rank, MPI_COMM_WORLD);
+  return data;
+}
+
+
 Array<int> Messenger::
 _broadcast(Array<int>& array, int root_rank) const
 {
   int size = array.size();
-  MPI_Bcast(&size, 1,  MPI_INT, root_rank, MPI_COMM_WORLD);
+  _broadcast(size, root_rank);
   if (commRank() != root_rank) {
     array = Array<int>(size);
   }

src/utils/Messenger.hpp

@@ -15,6 +15,7 @@ class Messenger
   int m_rank{0};
   int m_size{1};
 
+  int _broadcast(int& data, int root_rank) const;
   Array<int> _broadcast(Array<int>& array, int root_rank) const;
 
  public:
@@ -42,6 +43,18 @@ class Messenger
 
   void barrier() const;
 
+  template <typename DataType>
+  PASTIS_INLINE
+  DataType broadcast(const DataType& data, int root_rank) const
+  {
+    if constexpr(std::is_same<DataType, int>()) {
+      int int_data = data;
+      return _broadcast(int_data, root_rank);
+    } else {
+      static_assert(std::is_same<DataType, int>(), "unexpected type of data");
+    }
+  }
+
   template <typename DataType>
   PASTIS_INLINE
   Array<DataType> broadcast(const Array<DataType>& array, int root_rank) const
@@ -91,4 +104,11 @@ Array<DataType> broadcast(const Array<DataType>& array, int root_rank)
   return messenger().broadcast(array, root_rank);
 }
 
+template <typename DataType>
+PASTIS_INLINE
+DataType broadcast(const DataType& data, int root_rank)
+{
+  return messenger().broadcast(data, root_rank);
+}
+
 #endif // MESSENGER_HPP