11a4c9867e
The `VariantArrayHandle` will soon be deprecated for its replacement of `UnknownArrayHandle`. Thus, `Field` and related classes should start using the new `UnknownArrayHandle`.
161 lines
4.4 KiB
C++
161 lines
4.4 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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//
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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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#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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struct VTKM_ALWAYS_EXPORT StorageTagConstant
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{
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};
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namespace internal
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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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template <typename T>
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using StorageTagConstantSuperclass =
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typename vtkm::cont::ArrayHandleImplicit<ConstantFunctor<T>>::StorageTag;
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template <typename T>
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struct Storage<T, vtkm::cont::StorageTagConstant> : Storage<T, StorageTagConstantSuperclass<T>>
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{
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};
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} // namespace internal
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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::ArrayHandle<T, vtkm::cont::StorageTagConstant>
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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::ArrayHandle<T, vtkm::cont::StorageTagConstant>));
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VTKM_CONT
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ArrayHandleConstant(T value, vtkm::Id numberOfValues = 0)
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: Superclass(internal::FunctorToArrayHandleImplicitBuffers(internal::ConstantFunctor<T>(value),
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numberOfValues))
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{
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}
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/// \brief Returns the constant value stored in this array.
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///
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/// The value set in the constructor of this array is returned even if the number of values is 0.
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///
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VTKM_CONT T GetValue() const { return this->ReadPortal().GetFunctor()(0); }
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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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/// @cond SERIALIZATION
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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 SerializableTypeString<vtkm::cont::ArrayHandleConstant<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_Constant<" + SerializableTypeString<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 SerializableTypeString<vtkm::cont::ArrayHandle<T, vtkm::cont::StorageTagConstant>>
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: SerializableTypeString<vtkm::cont::ArrayHandleConstant<T>>
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{
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};
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}
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} // vtkm::cont
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namespace mangled_diy_namespace
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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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{
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private:
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using Type = vtkm::cont::ArrayHandleConstant<T>;
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using BaseType = vtkm::cont::ArrayHandle<typename Type::ValueType, typename Type::StorageTag>;
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public:
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static VTKM_CONT void save(BinaryBuffer& bb, const BaseType& obj)
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{
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vtkmdiy::save(bb, obj.GetNumberOfValues());
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vtkmdiy::save(bb, obj.ReadPortal().Get(0));
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}
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static VTKM_CONT void load(BinaryBuffer& bb, BaseType& obj)
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{
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vtkm::Id count = 0;
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vtkmdiy::load(bb, count);
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T value;
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vtkmdiy::load(bb, value);
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obj = vtkm::cont::make_ArrayHandleConstant(value, count);
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}
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};
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template <typename T>
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struct Serialization<vtkm::cont::ArrayHandle<T, vtkm::cont::StorageTagConstant>>
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: Serialization<vtkm::cont::ArrayHandleConstant<T>>
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{
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};
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} // diy
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/// @endcond SERIALIZATION
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#endif //vtk_m_cont_ArrayHandleConstant_h
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