PetscSession.h

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#if defined(PETSC_D) || defined(PETSC_Z)
 
#ifndef PETSCSESSION_H
#define PETSCSESSION_H
 
#include <string.h>
#include "petsc.h"
 
namespace CppNoddy {
 
 
  /* This initialises PETSc and then finalizes everything on destruction.
     Instantiate this object first, then it will only finalize on
     exit of main() */
  class PetscSession {
 
  private:
    /// Constructor is private -- there is only 1 instance
    PetscSession() {
    };
    
  public:
 
    static PetscSession* getInstance(int argc, char *argv[]) {
      static PetscSession instance;   
      PetscInitialize(&argc,&argv,(char*)0,(char*)0);
#if defined(DEBUG)
      PetscPrintf(PETSC_COMM_WORLD, "[DEBUG] Starting a PETSc session using command line options.\n");
#endif
      return &instance;
    }
 
     ~PetscSession() {
#if defined(DEBUG)
       PetscSynchronizedPrintf(PETSC_COMM_WORLD, "[DEBUG] Exiting the PETSc session.\n");
#endif
       PetscFinalize();
     }
 
    
    
  };
 
} // end CppNoddy namespace
 
#endif // include guard
 
#endif // check for PETSC_D and PETSC_Z