c255c0ebe7
Adding a function to conditionally do CastAndCall.
210 lines
7.7 KiB
C++
210 lines
7.7 KiB
C++
//============================================================================
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// Copyright (c) Kitware, Inc.
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// All rights reserved.
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// See LICENSE.txt for details.
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// This software is distributed WITHOUT ANY WARRANTY; without even
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// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the above copyright notice for more information.
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//
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// Copyright 2014 National Technology & Engineering Solutions of Sandia, LLC (NTESS).
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// Copyright 2014 UT-Battelle, LLC.
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// Copyright 2014 Los Alamos National Security.
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//
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// Under the terms of Contract DE-NA0003525 with NTESS,
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// the U.S. Government retains certain rights in this software.
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//
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// Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
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// Laboratory (LANL), the U.S. Government retains certain rights in
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// this software.
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//============================================================================
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#ifndef vtk_m_cont_internal_DynamicTransform_h
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#define vtk_m_cont_internal_DynamicTransform_h
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#include "vtkm/internal/IndexTag.h"
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#include <utility>
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namespace vtkm
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{
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namespace cont
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{
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template <typename T, typename S>
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class ArrayHandle;
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class CoordinateSystem;
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class Field;
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template <vtkm::IdComponent>
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class CellSetStructured;
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template <typename T>
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class CellSetSingleType;
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template <typename T, typename S, typename U, typename V>
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class CellSetExplicit;
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template <typename T, typename S>
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class CellSetPermutation;
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/// A Generic interface to CastAndCall. The default implementation simply calls
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/// DynamicObject's CastAndCall, but specializations of this function exist for
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/// other classes (e.g. Field, CoordinateSystem, ArrayHandle).
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template <typename DynamicObject, typename Functor, typename... Args>
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void CastAndCall(const DynamicObject& dynamicObject, Functor&& f, Args&&... args)
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{
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dynamicObject.CastAndCall(std::forward<Functor>(f), std::forward<Args>(args)...);
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}
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/// A specialization of CastAndCall for basic CoordinateSystem to make
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/// it be treated just like any other dynamic object
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// actually implemented in vtkm/cont/CoordinateSystem
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template <typename Functor, typename... Args>
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void CastAndCall(const CoordinateSystem& coords, Functor&& f, Args&&... args);
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/// A specialization of CastAndCall for basic Field to make
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/// it be treated just like any other dynamic object
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// actually implemented in vtkm/cont/Field
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template <typename Functor, typename... Args>
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void CastAndCall(const vtkm::cont::Field& field, Functor&& f, Args&&... args);
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/// A specialization of CastAndCall for basic ArrayHandle types,
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/// Since the type is already known no deduction is needed.
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/// This specialization is used to simplify numerous worklet algorithms
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template <typename T, typename U, typename Functor, typename... Args>
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void CastAndCall(const vtkm::cont::ArrayHandle<T, U>& handle, Functor&& f, Args&&... args)
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{
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f(handle, std::forward<Args>(args)...);
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}
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/// A specialization of CastAndCall for basic CellSetStructured types,
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/// Since the type is already known no deduction is needed.
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/// This specialization is used to simplify numerous worklet algorithms
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template <vtkm::IdComponent Dim, typename Functor, typename... Args>
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void CastAndCall(const vtkm::cont::CellSetStructured<Dim>& cellset, Functor&& f, Args&&... args)
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{
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f(cellset, std::forward<Args>(args)...);
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}
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/// A specialization of CastAndCall for basic CellSetSingleType types,
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/// Since the type is already known no deduction is needed.
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/// This specialization is used to simplify numerous worklet algorithms
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template <typename ConnectivityStorageTag, typename Functor, typename... Args>
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void CastAndCall(const vtkm::cont::CellSetSingleType<ConnectivityStorageTag>& cellset,
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Functor&& f,
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Args&&... args)
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{
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f(cellset, std::forward<Args>(args)...);
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}
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/// A specialization of CastAndCall for basic CellSetExplicit types,
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/// Since the type is already known no deduction is needed.
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/// This specialization is used to simplify numerous worklet algorithms
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template <typename T, typename S, typename U, typename V, typename Functor, typename... Args>
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void CastAndCall(const vtkm::cont::CellSetExplicit<T, S, U, V>& cellset,
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Functor&& f,
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Args&&... args)
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{
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f(cellset, std::forward<Args>(args)...);
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}
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/// A specialization of CastAndCall for basic CellSetPermutation types,
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/// Since the type is already known no deduction is needed.
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/// This specialization is used to simplify numerous worklet algorithms
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template <typename PermutationType, typename CellSetType, typename Functor, typename... Args>
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void CastAndCall(const vtkm::cont::CellSetPermutation<PermutationType, CellSetType>& cellset,
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Functor&& f,
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Args&&... args)
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{
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f(cellset, std::forward<Args>(args)...);
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}
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/// CastAndCall if the condition is true.
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template <typename... Args>
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void ConditionalCastAndCall(std::true_type, Args&&... args)
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{
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vtkm::cont::CastAndCall(std::forward<Args>(args)...);
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}
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/// No-op variant since the condition is false.
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template <typename... Args>
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void ConditionalCastAndCall(std::false_type, Args&&...)
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{
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}
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namespace internal
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{
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/// Tag used to identify an object that is a dynamic object that contains a
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/// CastAndCall method that iterates over all possible dynamic choices to run
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/// templated code.
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///
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struct DynamicTransformTagCastAndCall
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{
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};
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/// Tag used to identify an object that is a static object that, when used with
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/// a \c DynamicTransform should just pass itself as a concrete object.
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///
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struct DynamicTransformTagStatic
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{
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};
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/// A traits class that identifies whether an object used in a \c
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/// DynamicTransform should use a \c CastAndCall functionality or treated as a
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/// static object. The default implementation identifies the object as static
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/// (as most objects are bound to be). Dynamic objects that implement
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/// \c CastAndCall should specialize (or partially specialize) this traits class
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/// to identify the object as dynamic. VTK-m classes like \c DynamicArray are
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/// already specialized.
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///
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template <typename T>
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struct DynamicTransformTraits
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{
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/// A type set to either \c DynamicTransformTagStatic or \c
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/// DynamicTransformTagCastAndCall. The default implementation is set to \c
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/// DynamicTransformTagStatic. Dynamic objects that implement \c CastAndCall
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/// should specialize this class redefine it to \c
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/// DynamicTransformTagCastAndCall.
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///
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using DynamicTag = vtkm::cont::internal::DynamicTransformTagStatic;
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};
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/// This functor can be used as the transform in the \c DynamicTransformCont
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/// method of \c FunctionInterface. It will allow dynamic objects like
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/// \c DynamicArray to be cast to their concrete types for templated operation.
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///
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struct DynamicTransform
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{
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template <typename InputType, typename ContinueFunctor, vtkm::IdComponent Index>
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VTKM_CONT void operator()(const InputType& input,
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const ContinueFunctor& continueFunc,
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vtkm::internal::IndexTag<Index>) const
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{
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this->DoTransform(
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input,
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continueFunc,
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typename vtkm::cont::internal::DynamicTransformTraits<InputType>::DynamicTag());
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}
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private:
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template <typename InputType, typename ContinueFunctor>
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VTKM_CONT void DoTransform(const InputType& input,
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const ContinueFunctor& continueFunc,
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vtkm::cont::internal::DynamicTransformTagStatic) const
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{
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continueFunc(input);
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}
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template <typename InputType, typename ContinueFunctor>
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VTKM_CONT void DoTransform(const InputType& dynamicInput,
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const ContinueFunctor& continueFunc,
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vtkm::cont::internal::DynamicTransformTagCastAndCall) const
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{
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CastAndCall(dynamicInput, continueFunc);
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}
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};
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}
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}
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} // namespace vtkm::cont::internal
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#endif //vtk_m_cont_internal_DynamicTransform_h
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