clean up some trailing spaces

src/mpi_communicator.h

@@ -55,10 +55,10 @@ class MPICommunicator {
 
         std::vector<int> n_out;
         std::vector<int> n_in;
-       
+
         int buffer_size;
         std::vector<std::unique_ptr<T[]>> out_buffers;
-        
+
         void grow(int new_size){
             if(new_size <= buffer_size)
                 return;
@@ -98,7 +98,7 @@ class MPICommunicator {
             MPI_Status stat[2 * n_dim];
 
             for(int i = 0; i < n_dim; i++){
-                MPI_Isend( out_buffers[i].get(), n_out[i], MPI_T, i, 
+                MPI_Isend( out_buffers[i].get(), n_out[i], MPI_T, i,
                             1, MPI_COMM_WORLD, & req[req_count]);
                 req_count += 1;
             }
@@ -134,18 +134,18 @@ class MPICommunicator {
             for (int & n : n_out)
                 n = 0;
         }
-        
+
         ~MPICommunicator(){
             for(auto & buffer : out_buffers)
                 buffer.reset();
-    
+
             incoming_buffer.reset();
         }
 
         void set_outgoing(int dest, T data[], int n_data){
             while(n_out[dest] + n_data > buffer_size)
                 grow(2 * buffer_size);
-   
+
             T * buffer = out_buffers[dest].get();
             std::copy(& data[0], & data[n_data], & buffer[ n_out[dest] ]);
             n_out[dest] += n_data;
@@ -177,7 +177,7 @@ class MPIGridCommunicator : public MPICommunicator<T, MPI_T>{
         using MPICommunicator<T, MPI_T>::n_out;
         using MPICommunicator<T, MPI_T>::n_in;
         using MPICommunicator<T, MPI_T>::out_buffers;
-        
+
         virtual void sync_buffer_size(){
             int req_count = 0;
             MPI_Request req[2 * n_dim];
@@ -202,7 +202,7 @@ class MPIGridCommunicator : public MPICommunicator<T, MPI_T>{
             MPI_Status stat[2 * n_dim];
 
             for(int i = 0; i < n_dim; i++){
-                MPI_Isend( out_buffers[i].get(), n_out[i], MPI_T, mpi::neighbours[i], 
+                MPI_Isend( out_buffers[i].get(), n_out[i], MPI_T, mpi::neighbours[i],
                         1, mpi::cart_comm, & req[req_count]);
                 req_count += 1;
             }