mirror of
https://gitlab.kitware.com/vtk/vtk-m
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106 lines
3.0 KiB
C++
106 lines
3.0 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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// 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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// Copyright 2014 Sandia Corporation.
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// Copyright 2014 UT-Battelle, LLC.
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// Copyright 2014. Los Alamos National Security
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//
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// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
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// the U.S. Government retains certain rights in this software.
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//
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// Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
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// Laboratory (LANL), the U.S. Government retains certain rights in
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// this software.
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//============================================================================
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#ifndef vtk_m_cont_internal_ArrayPortalFromIterators_h
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#define vtk_m_cont_internal_ArrayPortalFromIterators_h
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#include <vtkm/Types.h>
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#include <vtkm/cont/ArrayPortal.h>
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#include <vtkm/cont/Assert.h>
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#include <iterator>
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namespace vtkm {
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namespace cont {
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namespace internal {
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/// This templated implementation of an ArrayPortal allows you to adapt a pair
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/// of begin/end iterators to an ArrayPortal interface.
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///
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template<class IteratorT>
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class ArrayPortalFromIterators
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{
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public:
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typedef IteratorT IteratorType;
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typedef typename std::iterator_traits<IteratorType>::value_type ValueType;
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VTKM_CONT_EXPORT ArrayPortalFromIterators() { }
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VTKM_CONT_EXPORT
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ArrayPortalFromIterators(IteratorType begin, IteratorType end)
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: BeginIterator(begin), EndIterator(end)
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{
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VTKM_ASSERT_CONT(this->GetNumberOfValues() >= 0);
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}
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/// Copy constructor for any other ArrayPortalFromIterators with an iterator
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/// type that can be copied to this iterator type. This allows us to do any
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/// type casting that the iterators do (like the non-const to const cast).
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///
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template<class OtherIteratorT>
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VTKM_CONT_EXPORT
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ArrayPortalFromIterators(const ArrayPortalFromIterators<OtherIteratorT> &src)
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: BeginIterator(src.GetIteratorBegin()),
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EndIterator(src.GetIteratorEnd())
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{ }
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VTKM_CONT_EXPORT
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vtkm::Id GetNumberOfValues() const
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{
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return std::distance(this->BeginIterator, this->EndIterator);
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}
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VTKM_CONT_EXPORT
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ValueType Get(vtkm::Id index) const
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{
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return *this->IteratorAt(index);
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}
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VTKM_CONT_EXPORT
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void Set(vtkm::Id index, const ValueType& value) const
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{
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*this->IteratorAt(index) = value;
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}
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VTKM_CONT_EXPORT
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IteratorType GetIteratorBegin() const { return this->BeginIterator; }
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VTKM_CONT_EXPORT
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IteratorType GetIteratorEnd() const { return this->EndIterator; }
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private:
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IteratorType BeginIterator;
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IteratorType EndIterator;
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VTKM_CONT_EXPORT
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IteratorType IteratorAt(vtkm::Id index) const
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{
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VTKM_ASSERT_CONT(index >= 0);
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VTKM_ASSERT_CONT(index < this->GetNumberOfValues());
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return this->BeginIterator + index;
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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 //vtkm_cont_internal_ArrayPortalFromIterators_h
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