HermitianIterativeEigenSolver.h

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/******************************************************************************
 * Copyright (c) 2021.                                                        *
 * The Regents of the University of Michigan and DFT-EFE developers.          *
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 * This file is part of the DFT-EFE code.                                     *
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 * DFT-EFE is free software: you can redistribute it and/or modify            *
 *   it under the terms of the Lesser GNU General Public License as           *
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 *   See the Lesser GNU General Public License for more details.              *
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/*
 * @author Avirup Sircar
 */
 
#ifndef dftefeHermitianIterativeEigenSolver_h
#define dftefeHermitianIterativeEigenSolver_h
 
#include <utils/TypeConfig.h>
#include <utils/MemorySpaceType.h>
#include <utils/MPITypes.h>
#include <linearAlgebra/Vector.h>
#include <linearAlgebra/MultiVector.h>
#include <linearAlgebra/IdentityOperatorContext.h>
#include <linearAlgebra/OperatorContext.h>
#include <linearAlgebra/BlasLapackTypedef.h>
#include <linearAlgebra/BlasLapack.h>
#include <linearAlgebra/LinearAlgebraTypes.h>
 
namespace dftefe
{
  namespace linearAlgebra
  {
    template <typename ValueTypeOperator,
              typename ValueTypeOperand,
              utils::MemorySpace memorySpace>
    class HermitianIterativeEigenSolver
    {
    public:
      using OpContext =
        OperatorContext<ValueTypeOperator, ValueTypeOperand, memorySpace>;
      using ValueType =
        blasLapack::scalar_type<ValueTypeOperator, ValueTypeOperand>;
      using RealType = blasLapack::real_type<ValueType>;
 
    public:
      virtual ~HermitianIterativeEigenSolver() = default;
 
      virtual EigenSolverError
      solve(const OpContext &                                   A,
            std::vector<RealType> &                             eigenValues,
            linearAlgebra::MultiVector<ValueType, memorySpace> &eigenVectors,
            bool             computeEigenVectors = false,
            const OpContext &B    = IdentityOperatorContext<ValueTypeOperator,
                                                         ValueTypeOperand,
                                                         memorySpace>(),
            const OpContext &BInv = IdentityOperatorContext<ValueTypeOperator,
                                                            ValueTypeOperand,
                                                            memorySpace>()) = 0;
 
    }; // end of class HermitianIterativeEigenSolver
  }    // end of namespace linearAlgebra
} // end of namespace dftefe
#endif // dftefeHermitianIterativeEigenSolver_h