mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-07-30 18:50:59 +00:00
70 lines
2.0 KiB
C++
70 lines
2.0 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_VecFromVirtPortal_h
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#define vtk_m_VecFromVirtPortal_h
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#include <vtkm/Types.h>
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#include <vtkm/VecFromPortal.h>
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#include <vtkm/internal/ArrayPortalVirtual.h>
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namespace vtkm
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{
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/// \brief A short variable-length array from a window in an ArrayPortal.
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///
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/// The \c VecFromPortal class is a Vec-like class that holds an array portal
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/// and exposes a small window of that portal as if it were a \c Vec.
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///
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template <typename T>
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class VTKM_ALWAYS_EXPORT VecFromVirtPortal
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{
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using RefType = vtkm::internal::ArrayPortalValueReference<vtkm::ArrayPortalRef<T>>;
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public:
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT
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VecFromVirtPortal(const vtkm::ArrayPortalRef<T>* portal,
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vtkm::IdComponent numComponents,
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vtkm::Id offset)
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: Portal(portal)
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, NumComponents(numComponents)
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, Offset(offset)
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{
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}
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VTKM_EXEC_CONT
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vtkm::IdComponent GetNumberOfComponents() const { return this->NumComponents; }
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template <vtkm::IdComponent DestSize>
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VTKM_EXEC_CONT void CopyInto(vtkm::Vec<T, DestSize>& dest) const
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{
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vtkm::IdComponent numComponents = vtkm::Min(DestSize, this->NumComponents);
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for (vtkm::IdComponent index = 0; index < numComponents; index++)
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{
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dest[index] = this->Portal->Get(index + this->Offset);
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}
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}
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT
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RefType operator[](vtkm::IdComponent index) const
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{
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return RefType(*this->Portal, index + this->Offset);
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}
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private:
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const vtkm::ArrayPortalRef<T>* Portal = nullptr;
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vtkm::IdComponent NumComponents = 0;
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vtkm::Id Offset = 0;
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};
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}
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#endif
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