mirror of
https://gitlab.kitware.com/vtk/vtk-m
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74 lines
2.2 KiB
C++
74 lines
2.2 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_exec_arg_ValueCount_h
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#define vtk_m_exec_arg_ValueCount_h
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#include <vtkm/exec/arg/ExecutionSignatureTagBase.h>
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#include <vtkm/exec/arg/Fetch.h>
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#include <vtkm/exec/arg/ThreadIndicesReduceByKey.h>
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namespace vtkm
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{
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namespace exec
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{
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namespace arg
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{
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/// \brief Aspect tag to use for getting the value count.
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///
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/// The \c AspectTagValueCount aspect tag causes the \c Fetch class to obtain
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/// the number of values that map to the key.
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///
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struct AspectTagValueCount
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{
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};
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/// \brief The \c ExecutionSignature tag to get the number of values.
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///
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/// A \c WorkletReduceByKey operates by collecting all values associated with
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/// identical keys and then giving the worklet a Vec-like object containing all
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/// values with a matching key. This \c ExecutionSignature tag provides the
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/// number of values associated with the key and given in the Vec-like objects.
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///
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struct ValueCount : vtkm::exec::arg::ExecutionSignatureTagBase
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{
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static constexpr vtkm::IdComponent INDEX = 1;
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using AspectTag = vtkm::exec::arg::AspectTagValueCount;
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};
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template <typename FetchTag, typename ExecObjectType>
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struct Fetch<FetchTag,
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vtkm::exec::arg::AspectTagValueCount,
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vtkm::exec::arg::ThreadIndicesReduceByKey,
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ExecObjectType>
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{
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using ThreadIndicesType = vtkm::exec::arg::ThreadIndicesReduceByKey;
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using ValueType = vtkm::IdComponent;
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC
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ValueType Load(const ThreadIndicesType& indices, const ExecObjectType&) const
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{
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return indices.GetNumberOfValues();
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}
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VTKM_EXEC
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void Store(const ThreadIndicesType&, const ExecObjectType&, const ValueType&) const
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{
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// Store is a no-op.
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}
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};
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}
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}
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} // namespace vtkm::exec::arg
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#endif //vtk_m_exec_arg_ValueCount_h
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