lbs_iterativemethods.h

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#ifndef LBS_ITERATIVE_METHODS_H
#define LBS_ITERATIVE_METHODS_H
 
#include <string>
 
namespace lbs
{
  enum class IterativeMethod : int
  {
    NONE                     = 0,
    CLASSICRICHARDSON        = 1, ///< Otherwise known as Source Iteration
    CLASSICRICHARDSON_CYCLES = 2, ///< Source Iteration with Cycles support
    GMRES                    = 3, ///< GMRES iterative algorithm
    GMRES_CYCLES             = 4, ///< GMRES with Cycles support
    KRYLOV_RICHARDSON        = 5, ///< Richardson iteration
    KRYLOV_RICHARDSON_CYCLES = 6, ///< Richardson iteration with cycles support
    KRYLOV_GMRES             = 7, ///< GMRES iterative algorithm
    KRYLOV_GMRES_CYCLES      = 8, ///< GMRES with Cycles support
    KRYLOV_BICGSTAB          = 9, ///< BiCGStab iterative algorithm
    KRYLOV_BICGSTAB_CYCLES   = 10,///< BiCGStab with Cycles support
  };
 
  inline std::string IterativeMethodPETScName(IterativeMethod it_method)
  {
    switch (it_method)
    {
      case IterativeMethod::NONE:                     return "preonly";
      case IterativeMethod::CLASSICRICHARDSON:
      case IterativeMethod::CLASSICRICHARDSON_CYCLES:
      case IterativeMethod::KRYLOV_RICHARDSON:
      case IterativeMethod::KRYLOV_RICHARDSON_CYCLES: return "richardson";
      case IterativeMethod::GMRES:
      case IterativeMethod::GMRES_CYCLES:
      case IterativeMethod::KRYLOV_GMRES:
      case IterativeMethod::KRYLOV_GMRES_CYCLES:      return "gmres";
      case IterativeMethod::KRYLOV_BICGSTAB:
      case IterativeMethod::KRYLOV_BICGSTAB_CYCLES:   return "bcgs";
    }
    return "";
  }
}
 
#endif