//============================================================================
//  Copyright (c) Kitware, Inc.
//  All rights reserved.
//  See LICENSE.txt for details.
//  This software is distributed WITHOUT ANY WARRANTY; without even
//  the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
//  PURPOSE.  See the above copyright notice for more information.
//
//  Copyright 2014 Sandia Corporation.
//  Copyright 2014 UT-Battelle, LLC.
//  Copyright 2014 Los Alamos National Security.
//
//  Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
//  the U.S. Government retains certain rights in this software.
//
//  Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
//  Laboratory (LANL), the U.S. Government retains certain rights in
//  this software.
//============================================================================
#ifndef vtk_m_exec_FunctorBase_h
#define vtk_m_exec_FunctorBase_h

#include <vtkm/Types.h>

#include <vtkm/exec/internal/ErrorMessageBuffer.h>

namespace vtkm {
namespace exec {

/// Base class for all functors invoked in the execution environment from a
/// call to vtkm::cont::DeviceAdapterAlgorithm::Schedule. Subclasses must
/// implement operator() const with an index argument.
///
/// This class contains a public method named RaiseError that can be called in
/// the execution environment to signal a problem.
///
class FunctorBase
{
public:
  VTKM_EXEC_CONT_EXPORT
  FunctorBase(): ErrorMessage() {  }

  VTKM_EXEC_EXPORT
  void RaiseError(const char *message) const
  {
    this->ErrorMessage.RaiseError(message);
  }

  /// Set the error message buffer so that running algorithms can report
  /// errors. This is supposed to be set by the dispatcher. This method may be
  /// replaced as the execution semantics change.
  ///
  VTKM_CONT_EXPORT
  void SetErrorMessageBuffer(
      const vtkm::exec::internal::ErrorMessageBuffer &buffer)
  {
    this->ErrorMessage = buffer;
  }

private:
  vtkm::exec::internal::ErrorMessageBuffer ErrorMessage;
};

}
} // namespace vtkm::exec

#endif //vtk_m_exec_FunctorBase_h