MpiFileIo.h

#ifndef UTIL_MPI_FILE_IO_H
#define UTIL_MPI_FILE_IO_H

/*
* Util Package - C++ Utilities for Scientific Computation
*
* Copyright 2010 - 2017, The Regents of the University of Minnesota
* Distributed under the terms of the GNU General Public License.
*/

#include <util/global.h>

#include <iostream>
#include <string>

namespace Util
{

   class MpiFileIo
   {

   public:

      MpiFileIo();

      MpiFileIo(const MpiFileIo& other);

      bool isIoProcessor() const;

      #ifdef UTIL_MPI

      void setIoCommunicator(MPI::Intracomm& communicator);

      void clearCommunicator();

      bool hasIoCommunicator() const;

      MPI::Intracomm& ioCommunicator() const;
      #endif

   private:

      bool isIoProcessor_;

      #ifdef UTIL_MPI
      MPI::Intracomm* communicatorPtr_;
      #endif

   };

   // Inline methods

   /*
   * Should this processor do file I/O ?
   */
   inline bool MpiFileIo::isIoProcessor() const
   {  return isIoProcessor_; }

   #ifdef UTIL_MPI
   /*
   * Does this processor have a communicator?
   */
   inline bool MpiFileIo::hasIoCommunicator() const
   {  return (communicatorPtr_ != 0); }

   /*
   * Get the communicator.
   */
   inline MPI::Intracomm& MpiFileIo::ioCommunicator() const
   {
      assert(communicatorPtr_);  
      return *communicatorPtr_; 
   }
   #endif
}

#endif