BelosOperatorTraits.hpp

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// @HEADER
// *****************************************************************************
//                 Belos: Block Linear Solvers Package
//
// Copyright 2004-2016 NTESS and the Belos contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER

#ifndef BELOS_OPERATOR_TRAITS_HPP
#define BELOS_OPERATOR_TRAITS_HPP

#include "BelosConfigDefs.hpp"
#include "BelosTypes.hpp"

namespace Belos {

  template<class ScalarType, class MV, class OP>
  class UndefinedOperatorTraits
  {
  public:
    static inline void notDefined() { 
      OP::this_type_is_missing_a_specialization(); 
    };
  };
 
  template <class ScalarType, class MV, class OP>
  class OperatorTraits 
  {
  public:

    static void 
    Apply (const OP& Op, 
     const MV& x, 
     MV& y, 
     ETrans trans = NOTRANS)
    { 
      // This will result in a deliberate compile-time error, if a
      // specialization of OperatorTraits has not been defined for the
      // MV and OP types.
      UndefinedOperatorTraits<ScalarType, MV, OP>::notDefined(); 
    };

    static bool HasApplyTranspose (const OP& Op) {
      return false;
    }
  };
  
} // end Belos namespace

#endif // BELOS_OPERATOR_TRAITS_HPP

// end of file BelosOperatorTraits.hpp