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https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-16 17:22:55 +00:00
Mark ArrayHandle constructors taking buffers, as explicit
This resolves a compiler ambiguity I hit during development. In my case, I created an `ArrayHandleDecorator` with one of the arrays being an `ArrayHandleTransform`. The ambiguity occurs in function `DecoratorStorageTraits<...>::BuffersToArray`, here an `ArrayHandleTransform` is constructed using buffers (`std::vector<vtkm::cont::internal::Buffer>`) This constructor is not defined for `ArrayHandleTransform`, but it's defined for its superclass (`vtkm::cont::ArrayHandle`). `ArrayHandleTransform` does have a non-explicit constructor that takes the array to be transformed and the transform-functor as parameters, where the later has a default value. This produces the following ambiguous options for the compiler: 1. Create a "to-be-transformed" ArrayHandle instance using the buffers, call the `ArrayHandleTransform` constructor with this array with the defaulted functor parameter. 2. Create the superclass instance using the buffer and call the `ArrayHandleTransform` constructor that takes the superclass. In this situation, option 2 is the correct choice. The ambiguity is resolved by marking the constructors that take buffers as explicit. These constructors are also added for the derived classess via the `VTK_M_ARRAY_HANDLE_SUBCLASS_IMPL` macro.
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@ -186,6 +186,18 @@ struct GetTypeInParentheses<void(T)>
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} \
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\
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VTKM_CONT \
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explicit classname(const std::vector<vtkm::cont::internal::Buffer>& buffers) \
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: Superclass(buffers) \
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{ \
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} \
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\
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VTKM_CONT \
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explicit classname(std::vector<vtkm::cont::internal::Buffer>&& buffers) noexcept \
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: Superclass(std::move(buffers)) \
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{ \
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} \
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\
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VTKM_CONT \
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Thisclass& operator=(const Thisclass& src) \
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{ \
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this->Superclass::operator=(src); \
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@ -332,12 +344,12 @@ public:
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/// Special constructor for subclass specializations that need to set the
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/// initial state array. Used when pulling data from other sources.
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///
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VTKM_CONT ArrayHandle(const std::vector<vtkm::cont::internal::Buffer>& buffers)
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VTKM_CONT explicit ArrayHandle(const std::vector<vtkm::cont::internal::Buffer>& buffers)
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: Buffers(buffers)
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{
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}
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VTKM_CONT ArrayHandle(std::vector<vtkm::cont::internal::Buffer>&& buffers) noexcept
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VTKM_CONT explicit ArrayHandle(std::vector<vtkm::cont::internal::Buffer>&& buffers) noexcept
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: Buffers(std::move(buffers))
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{
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}
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@ -230,11 +230,11 @@ public:
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static FirstArrayType GetFirstArray(const std::vector<vtkm::cont::internal::Buffer>& buffers)
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{
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return { FirstArrayBuffers(buffers) };
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return FirstArrayType(FirstArrayBuffers(buffers));
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}
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static SecondArrayType GetSecondArray(const std::vector<vtkm::cont::internal::Buffer>& buffers)
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{
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return { SecondArrayBuffers(buffers) };
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return SecondArrayType(SecondArrayBuffers(buffers));
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}
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};
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} // namespace internal
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@ -320,7 +320,7 @@ static void TestIndexing()
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vtkm::cont::CellSetStructured<3> outCellSet;
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outCellSet.SetPointDimensions({ outDim });
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vtkm::cont::ArrayHandleUniformPointCoordinates inField{ { inDim } };
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vtkm::cont::ArrayHandleUniformPointCoordinates inField(vtkm::Id3{ inDim });
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vtkm::cont::ArrayHandle<vtkm::Vec3f> outField;
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