mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-10-08 11:29:02 +00:00
68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
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//============================================================================
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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_internal_CastInvalidValue_h
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#define vtk_m_cont_internal_CastInvalidValue_h
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#include <vtkm/Math.h>
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#include <vtkm/Types.h>
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#include <vtkm/VecTraits.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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namespace internal
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{
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/// \brief Convert an invalid value to something type-appropriate.
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///
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/// There are algorithms in VTK-m that require a placeholder for invalid values in an array
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/// or field. For example, when probing something, a probe location outside of the source data
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/// has to be set to something.
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///
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/// Often we want to set this to something like NaN to make it clear that this is invalid.
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/// However, integer types cannot represent these non-finite numbers.
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///
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/// For convenience, it is easiest to allow the user to specify the invalid value as a
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/// vtkm::Float64 and use this function to convert it to something type-appropriate.
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///
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template <typename T>
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T CastInvalidValue(vtkm::Float64 invalidValue)
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{
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using ComponentType = typename vtkm::VecTraits<T>::BaseComponentType;
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if (std::is_same<vtkm::TypeTraitsIntegerTag, typename vtkm::TypeTraits<T>::NumericTag>::value)
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{
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// Casting to integer types
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if (vtkm::IsFinite(invalidValue))
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{
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return T(static_cast<ComponentType>(invalidValue));
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}
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else if (vtkm::IsInf(invalidValue) && (invalidValue > 0))
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{
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return T(std::numeric_limits<ComponentType>::max());
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}
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else
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{
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return T(std::numeric_limits<ComponentType>::min());
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}
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}
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else
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{
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// Not an integer type. Assume can be directly cast
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return T(static_cast<ComponentType>(invalidValue));
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}
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}
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}
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}
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} // namespace vtkm::cont::internal
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#endif //vtk_m_cont_internal_CastInvalidValue_h
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