mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-10-08 11:29:02 +00:00
589 lines
20 KiB
C++
589 lines
20 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_VecTraits_h
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#define vtk_m_VecTraits_h
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#include <vtkm/Types.h>
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namespace vtkm
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{
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/// A tag for vectors that are "true" vectors (i.e. have more than one
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/// component).
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///
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struct VecTraitsTagMultipleComponents
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{
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};
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/// A tag for vectors that are really just scalars (i.e. have only one
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/// component)
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///
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struct VecTraitsTagSingleComponent
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{
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};
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/// A tag for vectors where the number of components are known at compile time.
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///
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struct VecTraitsTagSizeStatic
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{
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};
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/// A tag for vectors where the number of components are not determined until
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/// run time.
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///
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struct VecTraitsTagSizeVariable
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{
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};
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namespace internal
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{
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template <vtkm::IdComponent numComponents>
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struct VecTraitsMultipleComponentChooser
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{
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using Type = vtkm::VecTraitsTagMultipleComponents;
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};
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template <>
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struct VecTraitsMultipleComponentChooser<1>
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{
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using Type = vtkm::VecTraitsTagSingleComponent;
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};
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} // namespace internal
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/// The VecTraits class gives several static members that define how
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/// to use a given type as a vector.
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///
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template <class VecType>
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struct VTKM_NEVER_EXPORT VecTraits
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{
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#ifdef VTKM_DOXYGEN_ONLY
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/// \brief Type of the components in the vector.
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///
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/// If the type is really a scalar, then the component type is the same as the scalar type.
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///
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using ComponentType = typename VecType::ComponentType;
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/// \brief Base component type in the vector.
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///
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/// Similar to ComponentType except that for nested vectors (e.g. Vec<Vec<T, M>, N>), it
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/// returns the base scalar type at the end of the composition (T in this example).
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///
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using BaseComponentType = typename vtkm::VecTraits<ComponentType>::BaseComponentType;
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/// \brief Number of components in the vector.
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///
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/// This is only defined for vectors of a static size.
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///
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static constexpr vtkm::IdComponent NUM_COMPONENTS = VecType::NUM_COMPONENTS;
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/// Number of components in the given vector.
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///
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static vtkm::IdComponent GetNumberOfComponents(const VecType& vec);
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/// \brief A tag specifying whether this vector has multiple components (i.e. is a "real" vector).
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///
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/// This tag can be useful for creating specialized functions when a vector
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/// is really just a scalar.
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///
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using HasMultipleComponents =
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typename internal::VecTraitsMultipleComponentChooser<NUM_COMPONENTS>::Type;
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/// \brief A tag specifying whether the size of this vector is known at compile time.
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///
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/// If set to \c VecTraitsTagSizeStatic, then \c NUM_COMPONENTS is set. If
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/// set to \c VecTraitsTagSizeVariable, then the number of components is not
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/// known at compile time and must be queried with \c GetNumberOfComponents.
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///
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using IsSizeStatic = vtkm::VecTraitsTagSizeStatic;
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/// Returns the value in a given component of the vector.
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///
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VTKM_EXEC_CONT static const ComponentType& GetComponent(
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const typename std::remove_const<VecType>::type& vector,
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vtkm::IdComponent component);
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VTKM_EXEC_CONT static ComponentType& GetComponent(
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typename std::remove_const<VecType>::type& vector,
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vtkm::IdComponent component);
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/// Changes the value in a given component of the vector.
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///
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VTKM_EXEC_CONT static void SetComponent(VecType& vector,
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vtkm::IdComponent component,
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ComponentType value);
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/// \brief Get a vector of the same type but with a different component.
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///
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/// This type resolves to another vector with a different component type. For example,
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/// @code vtkm::VecTraits<vtkm::Vec<T, N>>::ReplaceComponentType<T2> @endcode is vtkm::Vec<T2, N>.
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/// This replacement is not recursive. So @code VecTraits<Vec<Vec<T, M>, N>::ReplaceComponentType<T2> @endcode
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/// is vtkm::Vec<T2, N>.
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///
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template <typename NewComponentType>
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using ReplaceComponentType = VecTemplate<NewComponentType, N>;
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/// \brief Get a vector of the same type but with a different base component.
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///
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/// This type resolves to another vector with a different base component type. The replacement
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/// is recursive for nested types. For example,
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/// @code VecTraits<Vec<Vec<T, M>, N>::ReplaceComponentType<T2> @endcode is Vec<Vec<T2, M>, N>.
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///
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template <typename NewComponentType>
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using ReplaceBaseComponentType = VecTemplate<
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typename VecTraits<ComponentType>::template ReplaceBaseComponentType<NewComponentType>,
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N>;
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/// Copies the components in the given vector into a given Vec object.
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///
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template <vktm::IdComponent destSize>
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VTKM_EXEC_CONT static void CopyInto(const VecType& src, vtkm::Vec<ComponentType, destSize>& dest);
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#endif // VTKM_DOXYGEN_ONLY
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};
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namespace detail
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{
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template <typename T>
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struct HasVecTraitsImpl
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{
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template <typename A, typename S = typename vtkm::VecTraits<A>::ComponentType>
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static std::true_type Test(A*);
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static std::false_type Test(...);
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using Type = decltype(Test(std::declval<T*>()));
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};
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} // namespace detail
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/// \brief Determines whether the given type has VecTraits defined.
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///
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/// If the given type T has a valid VecTraits class, then HasVecTraits<T> will be set to
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/// std::true_type. Otherwise it will be set to std::false_type. For example,
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/// HasVecTraits<vtkm::Id> is the same as std::true_type whereas HasVecTraits<void *> is the same
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/// as std::false_type. This is useful to block the definition of methods using VecTraits when
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/// VecTraits are not defined.
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///
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template <typename T>
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using HasVecTraits = typename detail::HasVecTraitsImpl<T>::Type;
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// This partial specialization allows you to define a non-const version of
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// VecTraits and have it still work for const version.
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//
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template <typename T>
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struct VTKM_NEVER_EXPORT VecTraits<const T> : VecTraits<T>
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{
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};
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#if defined(VTKM_GCC) && (__GNUC__ <= 5)
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namespace detail
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{
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template <typename NewT, vtkm::IdComponent Size>
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struct VecReplaceComponentTypeGCC4or5
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{
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using type = vtkm::Vec<NewT, Size>;
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};
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template <typename T, vtkm::IdComponent Size, typename NewT>
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struct VecReplaceBaseComponentTypeGCC4or5
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{
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using type =
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vtkm::Vec<typename vtkm::VecTraits<T>::template ReplaceBaseComponentType<NewT>, Size>;
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};
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} // namespace detail
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#endif // GCC Version 4.8
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template <typename T, vtkm::IdComponent Size>
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struct VTKM_NEVER_EXPORT VecTraits<vtkm::Vec<T, Size>>
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{
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using VecType = vtkm::Vec<T, Size>;
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/// \brief Type of the components in the vector.
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///
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/// If the type is really a scalar, then the component type is the same as the scalar type.
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///
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using ComponentType = typename VecType::ComponentType;
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/// \brief Base component type in the vector.
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///
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/// Similar to ComponentType except that for nested vectors (e.g. Vec<Vec<T, M>, N>), it
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/// returns the base scalar type at the end of the composition (T in this example).
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///
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using BaseComponentType = typename vtkm::VecTraits<ComponentType>::BaseComponentType;
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/// Number of components in the vector.
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///
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static constexpr vtkm::IdComponent NUM_COMPONENTS = VecType::NUM_COMPONENTS;
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/// Number of components in the given vector.
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///
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VTKM_EXEC_CONT
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static vtkm::IdComponent GetNumberOfComponents(const VecType&) { return NUM_COMPONENTS; }
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/// A tag specifying whether this vector has multiple components (i.e. is a
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/// "real" vector). This tag can be useful for creating specialized functions
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/// when a vector is really just a scalar.
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///
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using HasMultipleComponents =
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typename internal::VecTraitsMultipleComponentChooser<NUM_COMPONENTS>::Type;
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/// A tag specifying whether the size of this vector is known at compile
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/// time. If set to \c VecTraitsTagSizeStatic, then \c NUM_COMPONENTS is set.
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/// If set to \c VecTraitsTagSizeVariable, then the number of components is
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/// not known at compile time and must be queried with \c
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/// GetNumberOfComponents.
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///
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using IsSizeStatic = vtkm::VecTraitsTagSizeStatic;
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/// Returns the value in a given component of the vector.
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///
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VTKM_EXEC_CONT
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static const ComponentType& GetComponent(const VecType& vector, vtkm::IdComponent component)
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{
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return vector[component];
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}
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VTKM_EXEC_CONT
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static ComponentType& GetComponent(VecType& vector, vtkm::IdComponent component)
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{
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return vector[component];
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}
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/// Changes the value in a given component of the vector.
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///
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VTKM_EXEC_CONT static void SetComponent(VecType& vector,
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vtkm::IdComponent component,
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ComponentType value)
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{
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vector[component] = value;
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}
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/// \brief Get a vector of the same type but with a different component.
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///
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/// This type resolves to another vector with a different component type. For example,
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/// @code vtkm::VecTraits<vtkm::Vec<T, N>>::ReplaceComponentType<T2> @endcode is vtkm::Vec<T2, N>.
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/// This replacement is not recursive. So @code VecTraits<Vec<Vec<T, M>, N>::ReplaceComponentType<T2> @endcode
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/// is vtkm::Vec<T2, N>.
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///@{
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#if defined(VTKM_GCC) && (__GNUC__ <= 5)
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// Silly workaround for bug in GCC <= 5
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template <typename NewComponentType>
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using ReplaceComponentType =
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typename detail::VecReplaceComponentTypeGCC4or5<NewComponentType, Size>::type;
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#else // !GCC <= 5
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template <typename NewComponentType>
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using ReplaceComponentType = vtkm::Vec<NewComponentType, Size>;
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#endif
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///@}
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/// \brief Get a vector of the same type but with a different base component.
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///
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/// This type resolves to another vector with a different base component type. The replacement
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/// is recursive for nested types. For example,
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/// @code VecTraits<Vec<Vec<T, M>, N>::ReplaceComponentType<T2> @endcode is Vec<Vec<T2, M>, N>.
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///@{
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#if defined(VTKM_GCC) && (__GNUC__ <= 5)
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// Silly workaround for bug in GCC <= 5
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template <typename NewComponentType>
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using ReplaceBaseComponentType =
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typename detail::VecReplaceBaseComponentTypeGCC4or5<T, Size, NewComponentType>::type;
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#else // !GCC <= 5
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template <typename NewComponentType>
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using ReplaceBaseComponentType = vtkm::Vec<
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typename vtkm::VecTraits<ComponentType>::template ReplaceBaseComponentType<NewComponentType>,
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Size>;
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#endif
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///@}
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/// Converts whatever type this vector is into the standard VTKm Tuple.
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///
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template <vtkm::IdComponent destSize>
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VTKM_EXEC_CONT static void CopyInto(const VecType& src, vtkm::Vec<ComponentType, destSize>& dest)
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{
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src.CopyInto(dest);
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}
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};
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template <typename T>
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struct VTKM_NEVER_EXPORT VecTraits<vtkm::VecC<T>>
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{
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using VecType = vtkm::VecC<T>;
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/// \brief Type of the components in the vector.
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///
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/// If the type is really a scalar, then the component type is the same as the scalar type.
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///
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using ComponentType = typename VecType::ComponentType;
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/// \brief Base component type in the vector.
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///
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/// Similar to ComponentType except that for nested vectors (e.g. Vec<Vec<T, M>, N>), it
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/// returns the base scalar type at the end of the composition (T in this example).
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///
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using BaseComponentType = typename vtkm::VecTraits<ComponentType>::BaseComponentType;
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/// Number of components in the given vector.
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///
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VTKM_EXEC_CONT
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static vtkm::IdComponent GetNumberOfComponents(const VecType& vector)
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{
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return vector.GetNumberOfComponents();
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}
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/// A tag specifying whether this vector has multiple components (i.e. is a
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/// "real" vector). This tag can be useful for creating specialized functions
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/// when a vector is really just a scalar.
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///
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/// The size of a \c VecC is not known until runtime and can always
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/// potentially have multiple components, this is always set to \c
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/// HasMultipleComponents.
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///
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using HasMultipleComponents = vtkm::VecTraitsTagMultipleComponents;
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/// A tag specifying whether the size of this vector is known at compile
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/// time. If set to \c VecTraitsTagSizeStatic, then \c NUM_COMPONENTS is set.
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/// If set to \c VecTraitsTagSizeVariable, then the number of components is
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/// not known at compile time and must be queried with \c
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/// GetNumberOfComponents.
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///
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using IsSizeStatic = vtkm::VecTraitsTagSizeVariable;
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/// Returns the value in a given component of the vector.
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///
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VTKM_EXEC_CONT
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static const ComponentType& GetComponent(const VecType& vector, vtkm::IdComponent component)
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{
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return vector[component];
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}
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VTKM_EXEC_CONT
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static ComponentType& GetComponent(VecType& vector, vtkm::IdComponent component)
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{
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return vector[component];
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}
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/// Changes the value in a given component of the vector.
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///
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VTKM_EXEC_CONT
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static void SetComponent(VecType& vector, vtkm::IdComponent component, ComponentType value)
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{
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vector[component] = value;
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}
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/// \brief Get a vector of the same type but with a different component.
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///
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/// This type resolves to another vector with a different component type. For example,
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/// @code vtkm::VecTraits<vtkm::Vec<T, N>>::ReplaceComponentType<T2> @endcode is vtkm::Vec<T2, N>.
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/// This replacement is not recursive. So @code VecTraits<Vec<Vec<T, M>, N>::ReplaceComponentType<T2> @endcode
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/// is vtkm::Vec<T2, N>.
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///
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template <typename NewComponentType>
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using ReplaceComponentType = vtkm::VecC<NewComponentType>;
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/// \brief Get a vector of the same type but with a different base component.
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///
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/// This type resolves to another vector with a different base component type. The replacement
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/// is recursive for nested types. For example,
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/// @code VecTraits<Vec<Vec<T, M>, N>::ReplaceComponentType<T2> @endcode is Vec<Vec<T2, M>, N>.
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///
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template <typename NewComponentType>
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using ReplaceBaseComponentType = vtkm::VecC<
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typename vtkm::VecTraits<ComponentType>::template ReplaceBaseComponentType<NewComponentType>>;
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/// Converts whatever type this vector is into the standard VTKm Tuple.
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///
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template <vtkm::IdComponent destSize>
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VTKM_EXEC_CONT static void CopyInto(const VecType& src, vtkm::Vec<ComponentType, destSize>& dest)
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{
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src.CopyInto(dest);
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}
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};
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template <typename T>
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struct VTKM_NEVER_EXPORT VecTraits<vtkm::VecCConst<T>>
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{
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using VecType = vtkm::VecCConst<T>;
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/// \brief Type of the components in the vector.
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///
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/// If the type is really a scalar, then the component type is the same as the scalar type.
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///
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using ComponentType = typename VecType::ComponentType;
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/// \brief Base component type in the vector.
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///
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/// Similar to ComponentType except that for nested vectors (e.g. Vec<Vec<T, M>, N>), it
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/// returns the base scalar type at the end of the composition (T in this example).
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///
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using BaseComponentType = typename vtkm::VecTraits<ComponentType>::BaseComponentType;
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/// Number of components in the given vector.
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///
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VTKM_EXEC_CONT
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static vtkm::IdComponent GetNumberOfComponents(const VecType& vector)
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{
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return vector.GetNumberOfComponents();
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}
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/// A tag specifying whether this vector has multiple components (i.e. is a
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/// "real" vector). This tag can be useful for creating specialized functions
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/// when a vector is really just a scalar.
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///
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/// The size of a \c VecCConst is not known until runtime and can always
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/// potentially have multiple components, this is always set to \c
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/// HasMultipleComponents.
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///
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using HasMultipleComponents = vtkm::VecTraitsTagMultipleComponents;
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/// A tag specifying whether the size of this vector is known at compile
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/// time. If set to \c VecTraitsTagSizeStatic, then \c NUM_COMPONENTS is set.
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/// If set to \c VecTraitsTagSizeVariable, then the number of components is
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/// not known at compile time and must be queried with \c
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/// GetNumberOfComponents.
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///
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using IsSizeStatic = vtkm::VecTraitsTagSizeVariable;
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/// Returns the value in a given component of the vector.
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///
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VTKM_EXEC_CONT
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static const ComponentType& GetComponent(const VecType& vector, vtkm::IdComponent component)
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{
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return vector[component];
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}
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/// Changes the value in a given component of the vector.
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///
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VTKM_EXEC_CONT
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static void SetComponent(VecType& vector, vtkm::IdComponent component, ComponentType value)
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{
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vector[component] = value;
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}
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/// \brief Get a vector of the same type but with a different component.
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///
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/// This type resolves to another vector with a different component type. For example,
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/// @code vtkm::VecTraits<vtkm::Vec<T, N>>::ReplaceComponentType<T2> @endcode is vtkm::Vec<T2, N>.
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/// This replacement is not recursive. So @code VecTraits<Vec<Vec<T, M>, N>::ReplaceComponentType<T2> @endcode
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/// is vtkm::Vec<T2, N>.
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///
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template <typename NewComponentType>
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using ReplaceComponentType = vtkm::VecCConst<NewComponentType>;
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/// \brief Get a vector of the same type but with a different base component.
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///
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/// This type resolves to another vector with a different base component type. The replacement
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/// is recursive for nested types. For example,
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/// @code VecTraits<Vec<Vec<T, M>, N>::ReplaceComponentType<T2> @endcode is Vec<Vec<T2, M>, N>.
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///
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template <typename NewComponentType>
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using ReplaceBaseComponentType = vtkm::VecCConst<
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typename vtkm::VecTraits<ComponentType>::template ReplaceBaseComponentType<NewComponentType>>;
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/// Converts whatever type this vector is into the standard VTKm Tuple.
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///
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template <vtkm::IdComponent destSize>
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VTKM_EXEC_CONT static void CopyInto(const VecType& src, vtkm::Vec<ComponentType, destSize>& dest)
|
|
{
|
|
src.CopyInto(dest);
|
|
}
|
|
};
|
|
|
|
namespace internal
|
|
{
|
|
/// Used for overriding VecTraits for basic scalar types.
|
|
///
|
|
template <typename ScalarType>
|
|
struct VTKM_NEVER_EXPORT VecTraitsBasic
|
|
{
|
|
using ComponentType = ScalarType;
|
|
using BaseComponentType = ScalarType;
|
|
static constexpr vtkm::IdComponent NUM_COMPONENTS = 1;
|
|
using HasMultipleComponents = vtkm::VecTraitsTagSingleComponent;
|
|
using IsSizeStatic = vtkm::VecTraitsTagSizeStatic;
|
|
|
|
VTKM_EXEC_CONT
|
|
static vtkm::IdComponent GetNumberOfComponents(const ScalarType&) { return 1; }
|
|
|
|
VTKM_EXEC_CONT
|
|
static const ComponentType& GetComponent(const ScalarType& vector, vtkm::IdComponent)
|
|
{
|
|
return vector;
|
|
}
|
|
VTKM_EXEC_CONT
|
|
static ComponentType& GetComponent(ScalarType& vector, vtkm::IdComponent) { return vector; }
|
|
|
|
VTKM_EXEC_CONT static void SetComponent(ScalarType& vector,
|
|
vtkm::IdComponent,
|
|
ComponentType value)
|
|
{
|
|
vector = value;
|
|
}
|
|
|
|
template <typename NewComponentType>
|
|
using ReplaceComponentType = NewComponentType;
|
|
|
|
template <typename NewComponentType>
|
|
using ReplaceBaseComponentType = NewComponentType;
|
|
|
|
template <vtkm::IdComponent destSize>
|
|
VTKM_EXEC_CONT static void CopyInto(const ScalarType& src, vtkm::Vec<ScalarType, destSize>& dest)
|
|
{
|
|
dest[0] = src;
|
|
}
|
|
};
|
|
} // namespace internal
|
|
|
|
/// \brief VecTraits for Pair types
|
|
///
|
|
/// Although a pair would seem better as a size-2 vector, we treat it as a
|
|
/// scalar. This is because a \c Vec is assumed to have the same type for
|
|
/// every component, and a pair in general has a different type for each
|
|
/// component. Thus we treat a pair as a "scalar" unit.
|
|
///
|
|
template <typename T, typename U>
|
|
struct VTKM_NEVER_EXPORT VecTraits<vtkm::Pair<T, U>>
|
|
: public vtkm::internal::VecTraitsBasic<vtkm::Pair<T, U>>
|
|
{
|
|
};
|
|
|
|
} // anonymous namespace
|
|
|
|
#define VTKM_BASIC_TYPE_VECTOR(type) \
|
|
namespace vtkm \
|
|
{ \
|
|
template <> \
|
|
struct VTKM_NEVER_EXPORT VecTraits<type> : public vtkm::internal::VecTraitsBasic<type> \
|
|
{ \
|
|
}; \
|
|
}
|
|
|
|
/// Allows you to treat basic types as if they were vectors.
|
|
|
|
VTKM_BASIC_TYPE_VECTOR(float)
|
|
VTKM_BASIC_TYPE_VECTOR(double)
|
|
|
|
VTKM_BASIC_TYPE_VECTOR(bool)
|
|
VTKM_BASIC_TYPE_VECTOR(char)
|
|
VTKM_BASIC_TYPE_VECTOR(signed char)
|
|
VTKM_BASIC_TYPE_VECTOR(unsigned char)
|
|
VTKM_BASIC_TYPE_VECTOR(short)
|
|
VTKM_BASIC_TYPE_VECTOR(unsigned short)
|
|
VTKM_BASIC_TYPE_VECTOR(int)
|
|
VTKM_BASIC_TYPE_VECTOR(unsigned int)
|
|
VTKM_BASIC_TYPE_VECTOR(long)
|
|
VTKM_BASIC_TYPE_VECTOR(unsigned long)
|
|
VTKM_BASIC_TYPE_VECTOR(long long)
|
|
VTKM_BASIC_TYPE_VECTOR(unsigned long long)
|
|
|
|
//#undef VTKM_BASIC_TYPE_VECTOR
|
|
|
|
#endif //vtk_m_VecTraits_h
|