2019-04-15 23:24:21 +00:00
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//============================================================================
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2015-09-01 21:42:45 +00:00
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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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2019-04-15 23:24:21 +00:00
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//============================================================================
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2015-09-01 21:42:45 +00:00
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#ifndef vtk_m_cont_ArrayHandleCast_h
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#define vtk_m_cont_ArrayHandleCast_h
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#include <vtkm/cont/ArrayHandleTransform.h>
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2019-03-15 19:15:47 +00:00
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#include <vtkm/cont/Logging.h>
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#include <vtkm/Range.h>
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2019-09-09 19:01:03 +00:00
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#include <vtkm/VecTraits.h>
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#include <limits>
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2017-05-18 14:29:41 +00:00
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namespace vtkm
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{
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namespace cont
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{
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2015-09-01 21:42:45 +00:00
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2017-05-18 14:29:41 +00:00
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namespace internal
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{
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2015-09-01 21:42:45 +00:00
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2017-05-18 14:29:41 +00:00
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template <typename FromType, typename ToType>
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2016-12-19 19:39:17 +00:00
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struct VTKM_ALWAYS_EXPORT Cast
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{
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2016-10-19 22:42:58 +00:00
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VTKM_EXEC_CONT
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ToType operator()(const FromType& val) const { return static_cast<ToType>(val); }
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};
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} // namespace internal
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/// \brief Cast the values of an array to the specified type, on demand.
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///
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/// ArrayHandleCast is a specialization of ArrayHandleTransform. Given an ArrayHandle
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/// and a type, it creates a new handle that returns the elements of the array cast
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/// to the specified type.
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///
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template <typename T, typename ArrayHandleType>
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class ArrayHandleCast
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: public vtkm::cont::ArrayHandleTransform<ArrayHandleType,
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internal::Cast<typename ArrayHandleType::ValueType, T>,
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internal::Cast<T, typename ArrayHandleType::ValueType>>
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2015-09-22 14:11:51 +00:00
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{
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public:
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VTKM_ARRAY_HANDLE_SUBCLASS(
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ArrayHandleCast,
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(ArrayHandleCast<T, ArrayHandleType>),
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(vtkm::cont::ArrayHandleTransform<ArrayHandleType,
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internal::Cast<typename ArrayHandleType::ValueType, T>,
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internal::Cast<T, typename ArrayHandleType::ValueType>>));
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ArrayHandleCast(const ArrayHandleType& handle)
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: Superclass(handle)
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{
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this->ValidateTypeCast<typename ArrayHandleType::ValueType>();
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}
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2019-12-09 22:56:08 +00:00
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/// Implemented so that it is defined exclusively in the control environment.
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/// If there is a separate device for the execution environment (for example,
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/// with CUDA), then the automatically generated destructor could be
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/// created for all devices, and it would not be valid for all devices.
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///
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~ArrayHandleCast() {}
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private:
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// Log warnings if type cast is valid but lossy:
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template <typename SrcValueType>
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VTKM_CONT static typename std::enable_if<!std::is_same<T, SrcValueType>::value>::type
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ValidateTypeCast()
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{
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#ifdef VTKM_ENABLE_LOGGING
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using DstValueType = T;
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using SrcComp = typename vtkm::VecTraits<SrcValueType>::BaseComponentType;
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using DstComp = typename vtkm::VecTraits<DstValueType>::BaseComponentType;
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using SrcLimits = std::numeric_limits<SrcComp>;
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using DstLimits = std::numeric_limits<DstComp>;
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const vtkm::Range SrcRange{ SrcLimits::min(), SrcLimits::max() };
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const vtkm::Range DstRange{ DstLimits::min(), DstLimits::max() };
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const bool RangeLoss = (SrcRange.Max > DstRange.Max || SrcRange.Min < DstRange.Min);
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const bool PrecLoss = SrcLimits::digits > DstLimits::digits;
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if (RangeLoss && PrecLoss)
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{
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VTKM_LOG_F(vtkm::cont::LogLevel::Warn,
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"VariantArrayHandle::AsVirtual: Casting ComponentType of "
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"%s to %s reduces range and precision.",
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vtkm::cont::TypeToString<SrcValueType>().c_str(),
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vtkm::cont::TypeToString<DstValueType>().c_str());
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}
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else if (RangeLoss)
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{
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VTKM_LOG_F(vtkm::cont::LogLevel::Warn,
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"VariantArrayHandle::AsVirtual: Casting ComponentType of "
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"%s to %s reduces range.",
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vtkm::cont::TypeToString<SrcValueType>().c_str(),
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vtkm::cont::TypeToString<DstValueType>().c_str());
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}
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else if (PrecLoss)
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{
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VTKM_LOG_F(vtkm::cont::LogLevel::Warn,
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"VariantArrayHandle::AsVirtual: Casting ComponentType of "
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"%s to %s reduces precision.",
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vtkm::cont::TypeToString<SrcValueType>().c_str(),
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vtkm::cont::TypeToString<DstValueType>().c_str());
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}
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#endif // Logging
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}
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template <typename SrcValueType>
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VTKM_CONT static typename std::enable_if<std::is_same<T, SrcValueType>::value>::type
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ValidateTypeCast()
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{
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//no-op if types match
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}
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2015-09-22 14:11:51 +00:00
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};
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2017-09-27 16:56:22 +00:00
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namespace detail
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{
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2017-09-27 16:56:22 +00:00
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template <typename CastType, typename OriginalType, typename ArrayType>
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struct MakeArrayHandleCastImpl
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{
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using ReturnType = vtkm::cont::ArrayHandleCast<CastType, ArrayType>;
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VTKM_CONT static ReturnType DoMake(const ArrayType& array) { return ReturnType(array); }
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};
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template <typename T, typename ArrayType>
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struct MakeArrayHandleCastImpl<T, T, ArrayType>
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{
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using ReturnType = ArrayType;
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VTKM_CONT static ReturnType DoMake(const ArrayType& array) { return array; }
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};
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} // namespace detail
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/// make_ArrayHandleCast is convenience function to generate an
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/// ArrayHandleCast.
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///
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template <typename T, typename ArrayType>
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VTKM_CONT
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typename detail::MakeArrayHandleCastImpl<T, typename ArrayType::ValueType, ArrayType>::ReturnType
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make_ArrayHandleCast(const ArrayType& array, const T& = T())
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{
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VTKM_IS_ARRAY_HANDLE(ArrayType);
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using MakeImpl = detail::MakeArrayHandleCastImpl<T, typename ArrayType::ValueType, ArrayType>;
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return MakeImpl::DoMake(array);
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}
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}
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} // namespace vtkm::cont
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2018-06-08 15:56:40 +00:00
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//=============================================================================
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// Specializations of serialization related classes
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2019-09-12 21:19:36 +00:00
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/// @cond SERIALIZATION
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2018-06-08 15:56:40 +00:00
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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 T1, typename T2>
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struct SerializableTypeString<vtkm::cont::internal::Cast<T1, T2>>
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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_Cast_Functor<" + SerializableTypeString<T1>::Get() + "," +
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SerializableTypeString<T2>::Get() + ">";
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return name;
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}
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};
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template <typename T, typename AH>
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struct SerializableTypeString<vtkm::cont::ArrayHandleCast<T, AH>>
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: SerializableTypeString<
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vtkm::cont::ArrayHandleTransform<AH,
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vtkm::cont::internal::Cast<typename AH::ValueType, T>,
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vtkm::cont::internal::Cast<T, typename AH::ValueType>>>
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{
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};
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}
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} // namespace vtkm::cont
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2019-02-05 16:02:29 +00:00
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namespace mangled_diy_namespace
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{
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template <typename T1, typename T2>
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struct Serialization<vtkm::cont::internal::Cast<T1, T2>>
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{
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static VTKM_CONT void save(BinaryBuffer&, const vtkm::cont::internal::Cast<T1, T2>&) {}
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static VTKM_CONT void load(BinaryBuffer&, vtkm::cont::internal::Cast<T1, T2>&) {}
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};
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template <typename T, typename AH>
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struct Serialization<vtkm::cont::ArrayHandleCast<T, AH>>
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: Serialization<
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vtkm::cont::ArrayHandleTransform<AH,
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vtkm::cont::internal::Cast<typename AH::ValueType, T>,
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vtkm::cont::internal::Cast<T, typename AH::ValueType>>>
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{
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};
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} // diy
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2019-09-12 21:19:36 +00:00
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/// @endcond SERIALIZATION
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2015-09-01 21:42:45 +00:00
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#endif // vtk_m_cont_ArrayHandleCast_h
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