ExecutionAndControlObjectBase.h

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//============================================================================
//  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.
//============================================================================
#ifndef vtk_m_cont_ExecutionAndControlObjectBase_h
#define vtk_m_cont_ExecutionAndControlObjectBase_h
 
#include <vtkm/cont/ExecutionObjectBase.h>
 
namespace vtkm
{
namespace cont
{
 
struct ExecutionAndControlObjectBase : vtkm::cont::ExecutionObjectBase
{
};
 
namespace internal
{
 
namespace detail
{
 
struct CheckPrepareForControl
{
  template <typename T>
  static auto check(T* p) -> decltype(p->PrepareForControl(), std::true_type());
 
  template <typename T>
  static auto check(...) -> std::false_type;
};
 
} // namespace detail
 
template <typename T>
using IsExecutionAndControlObjectBase =
  std::is_base_of<vtkm::cont::ExecutionAndControlObjectBase, typename std::decay<T>::type>;
 
template <typename T>
struct HasPrepareForControl
  : decltype(detail::CheckPrepareForControl::check<typename std::decay<T>::type>(nullptr))
{
};
 
#define VTKM_IS_EXECUTION_AND_CONTROL_OBJECT(execObject)                                          \
  static_assert(::vtkm::cont::internal::IsExecutionAndControlObjectBase<execObject>::value,       \
                "Provided type is not a subclass of vtkm::cont::ExecutionAndControlObjectBase."); \
  static_assert(::vtkm::cont::internal::HasPrepareForExecution<execObject>::value,                \
                "Provided type does not have requisite PrepareForExecution method.");             \
  static_assert(::vtkm::cont::internal::HasPrepareForControl<execObject>::value,                  \
                "Provided type does not have requisite PrepareForControl method.")
 
template <typename T>
VTKM_CONT auto CallPrepareForControl(T&& execObject) -> decltype(execObject.PrepareForControl())
{
  VTKM_IS_EXECUTION_AND_CONTROL_OBJECT(T);
 
  return execObject.PrepareForControl();
}
 
template <typename ExecutionAndControlObject>
using ControlObjectType =
  decltype(CallPrepareForControl(std::declval<ExecutionAndControlObject>()));
 
} // namespace internal
}
} // namespace vtkm::cont
 
#endif //vtk_m_cont_ExecutionAndControlObjectBase_h