125 lines
3.4 KiB
C++
125 lines
3.4 KiB
C++
//=============================================================================
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//
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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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//
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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 2015 National Technology & Engineering Solutions of Sandia, LLC (NTESS).
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// Copyright 2015 UT-Battelle, LLC.
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// Copyright 2015 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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// 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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//=============================================================================
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#ifndef vtk_m_cont_ArrayHandleConstant_h
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#define vtk_m_cont_ArrayHandleConstant_h
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#include <vtkm/cont/ArrayHandleImplicit.h>
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namespace vtkm
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{
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namespace cont
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{
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namespace detail
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{
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template <typename ValueType>
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struct VTKM_ALWAYS_EXPORT ConstantFunctor
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{
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VTKM_EXEC_CONT
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ConstantFunctor(const ValueType& value = ValueType())
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: Value(value)
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{
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}
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VTKM_EXEC_CONT
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ValueType operator()(vtkm::Id vtkmNotUsed(index)) const { return this->Value; }
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private:
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ValueType Value;
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};
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} // namespace detail
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/// \brief An array handle with a constant value.
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///
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/// ArrayHandleConstant is an implicit array handle with a constant value. A
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/// constant array handle is constructed by giving a value and an array length.
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/// The resulting array is of the given size with each entry the same value
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/// given in the constructor. The array is defined implicitly, so there it
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/// takes (almost) no memory.
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///
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template <typename T>
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class ArrayHandleConstant : public vtkm::cont::ArrayHandleImplicit<detail::ConstantFunctor<T>>
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{
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public:
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VTKM_ARRAY_HANDLE_SUBCLASS(ArrayHandleConstant,
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(ArrayHandleConstant<T>),
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(vtkm::cont::ArrayHandleImplicit<detail::ConstantFunctor<T>>));
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VTKM_CONT
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ArrayHandleConstant(T value, vtkm::Id numberOfValues = 0)
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: Superclass(detail::ConstantFunctor<T>(value), numberOfValues)
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{
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}
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};
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/// make_ArrayHandleConstant is convenience function to generate an
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/// ArrayHandleImplicit. It takes a functor and the virtual length of the
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/// array.
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///
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template <typename T>
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vtkm::cont::ArrayHandleConstant<T> make_ArrayHandleConstant(T value, vtkm::Id numberOfValues)
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{
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return vtkm::cont::ArrayHandleConstant<T>(value, numberOfValues);
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}
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}
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} // vtkm::cont
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//=============================================================================
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// Specializations of serialization related classes
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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>
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struct TypeString<vtkm::cont::detail::ConstantFunctor<T>>
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{
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static VTKM_CONT const std::string& Get()
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{
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static std::string name = "AH_ConstantFunctor<" + TypeString<T>::Get() + ">";
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return name;
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}
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};
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template <typename T>
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struct TypeString<vtkm::cont::ArrayHandleConstant<T>>
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: TypeString<vtkm::cont::ArrayHandleImplicit<vtkm::cont::detail::ConstantFunctor<T>>>
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{
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};
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}
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} // vtkm::cont
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namespace diy
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{
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template <typename T>
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struct Serialization<vtkm::cont::ArrayHandleConstant<T>>
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: Serialization<vtkm::cont::ArrayHandleImplicit<vtkm::cont::detail::ConstantFunctor<T>>>
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{
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};
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} // diy
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#endif //vtk_m_cont_ArrayHandleConstant_h
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