MueLu_AlgebraicPermutationStrategy_decl.hpp

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/*
 * MueLu_AlgebraicPermutationStrategy_decl.hpp
 *
 *  Created on: Feb 20, 2013
 *      Author: tobias
 */

#ifndef MUELU_ALGEBRAICPERMUTATIONSTRATEGY_DECL_HPP_
#define MUELU_ALGEBRAICPERMUTATIONSTRATEGY_DECL_HPP_

#include <Xpetra_MultiVector_fwd.hpp>
#include <Xpetra_Matrix_fwd.hpp>
#include <Xpetra_CrsGraph_fwd.hpp>
#include <Xpetra_Vector_fwd.hpp>
#include <Xpetra_MultiVectorFactory_fwd.hpp>
#include <Xpetra_VectorFactory_fwd.hpp>
#include <Xpetra_CrsMatrixWrap_fwd.hpp>
#include <Xpetra_Export_fwd.hpp>
#include <Xpetra_ExportFactory_fwd.hpp>
#include <Xpetra_Import_fwd.hpp>
#include <Xpetra_ImportFactory_fwd.hpp>

#include "MueLu_ConfigDefs.hpp"
#include "MueLu_Level.hpp"
#include "MueLu_BaseClass.hpp"

namespace MueLu {

// template struct for comparing pairs
template<class Scalar = DefaultScalar, class LocalOrdinal = DefaultGlobalOrdinal>
struct CompPairs {
  CompPairs(const std::vector<Scalar> & v) : vinternal_(v) {}
  std::vector<Scalar> vinternal_;
  bool operator()(LocalOrdinal a, LocalOrdinal b) {
    //return vinternal_[a] < vinternal_[b];
    return Teuchos::ScalarTraits<Scalar>::magnitude(vinternal_[a]) > Teuchos::ScalarTraits<Scalar>::magnitude(vinternal_[b]);
  }
};

// template function for comparison
template<class Scalar, class LocalOrdinal>
CompPairs<Scalar,LocalOrdinal> CreateCmpPairs(const std::vector<Scalar> & v) {
  return CompPairs<Scalar,LocalOrdinal>(v);
}

// template function for sorting permutations
template<class Scalar, class LocalOrdinal>
void sortingPermutation(const std::vector<Scalar> & values, std::vector<LocalOrdinal> & v) {
  size_t size = values.size();
  v.clear(); v.reserve(size);
  for(size_t i=0; i<size; ++i)
    v.push_back(i);

  std::sort(v.begin(),v.end(), MueLu::CreateCmpPairs<Scalar,LocalOrdinal>(values));
}


  template <class Scalar = DefaultScalar,
            class LocalOrdinal = DefaultLocalOrdinal,
            class GlobalOrdinal = DefaultGlobalOrdinal,
            class Node = DefaultNode>
  class AlgebraicPermutationStrategy : public BaseClass {
#undef MUELU_ALGEBRAICPERMUTATIONSTRATEGY_SHORT
#include "MueLu_UseShortNames.hpp"
  public:




    void BuildPermutation(const Teuchos::RCP<Matrix> & A, const Teuchos::RCP<const Map>& permRowMap,
                          Level & currentLevel, const FactoryBase* genFactory) const;



  private:
   };

} // namespace MueLu

#define MUELU_ALGEBRAICPERMUTATIONSTRATEGY_SHORT


#endif /* MUELU_ALGEBRAICPERMUTATIONSTRATEGY_DECL_HPP_ */