mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-07-30 18:50:59 +00:00
ac889b5004
The `VecTraits` class allows templated functions, methods, and classes to treat type arguments uniformly as `Vec` types or to otherwise differentiate between scalar and vector types. This only works for types that `VecTraits` is defined for. The `VecTraits` templated class now has a default implementation that will be used for any type that does not have a `VecTraits` specialization. This removes many surprise compiler errors when using a template that, unknown to you, has `VecTraits` in its implementation. One potential issue is that if `VecTraits` gets defined for a new type, the behavior of `VecTraits` could change for that type in backward-incompatible ways. If `VecTraits` is used in a purely generic way, this should not be an issue. However, if assumptions were made about the components and length, this could cause problems. Fixes #589
100 lines
2.9 KiB
C++
100 lines
2.9 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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#include <vtkm/cont/internal/CastInvalidValue.h>
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#include <vtkm/cont/internal/MapArrayPermutation.h>
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#include <vtkm/cont/ErrorBadType.h>
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#include <vtkm/worklet/WorkletMapField.h>
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namespace
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{
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template <typename T>
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struct MapPermutationWorklet : vtkm::worklet::WorkletMapField
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{
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T InvalidValue;
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explicit MapPermutationWorklet(T invalidValue)
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: InvalidValue(invalidValue)
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{
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}
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using ControlSignature = void(FieldIn permutationIndex, WholeArrayIn input, FieldOut output);
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template <typename InputPortalType, typename OutputType>
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VTKM_EXEC void operator()(vtkm::Id permutationIndex,
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InputPortalType inputPortal,
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OutputType& output) const
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{
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if ((permutationIndex >= 0) && (permutationIndex < inputPortal.GetNumberOfValues()))
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{
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output = inputPortal.Get(permutationIndex);
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}
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else
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{
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output = this->InvalidValue;
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}
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}
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};
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struct DoMapFieldPermutation
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{
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template <typename InputArrayType, typename PermutationArrayType>
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void operator()(const InputArrayType& input,
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const PermutationArrayType& permutation,
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vtkm::cont::UnknownArrayHandle& output,
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vtkm::Float64 invalidValue) const
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{
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using BaseComponentType = typename InputArrayType::ValueType::ComponentType;
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MapPermutationWorklet<BaseComponentType> worklet(
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vtkm::cont::internal::CastInvalidValue<BaseComponentType>(invalidValue));
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vtkm::cont::Invoker{}(
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worklet,
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permutation,
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input,
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output.ExtractArrayFromComponents<BaseComponentType>(vtkm::CopyFlag::Off));
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}
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};
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} // anonymous namespace
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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 internal
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{
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vtkm::cont::UnknownArrayHandle MapArrayPermutation(
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const vtkm::cont::UnknownArrayHandle& inputArray,
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const vtkm::cont::UnknownArrayHandle& permutation,
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vtkm::Float64 invalidValue)
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{
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if (!permutation.IsBaseComponentType<vtkm::Id>())
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{
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throw vtkm::cont::ErrorBadType("Permutation array input to MapArrayPermutation must have "
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"values of vtkm::Id. Reported type is " +
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permutation.GetBaseComponentTypeName());
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}
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vtkm::cont::UnknownArrayHandle outputArray = inputArray.NewInstanceBasic();
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outputArray.Allocate(permutation.GetNumberOfValues());
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inputArray.CastAndCallWithExtractedArray(
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DoMapFieldPermutation{}, permutation.ExtractComponent<vtkm::Id>(0), outputArray, invalidValue);
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return outputArray;
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}
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}
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}
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} // namespace vtkm::cont::internal
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