mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-10-05 18:08:59 +00:00
2d4d54b170
...and add unit test. Related to !2071, #502.
208 lines
6.3 KiB
C++
208 lines
6.3 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_cont_internal_ArrayPortalFromIterators_h
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#define vtk_m_cont_internal_ArrayPortalFromIterators_h
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#include <vtkm/Assert.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/ArrayPortalToIterators.h>
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#include <vtkm/cont/ErrorBadAllocation.h>
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#include <iterator>
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#include <limits>
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#include <type_traits>
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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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template <typename IteratorT, typename Enable = void>
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class ArrayPortalFromIterators;
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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<IteratorT,
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typename std::enable_if<!std::is_const<
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typename std::remove_pointer<IteratorT>::type>::value>::type>
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{
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public:
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using ValueType = typename std::iterator_traits<IteratorT>::value_type;
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using IteratorType = IteratorT;
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ArrayPortalFromIterators() = default;
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_CONT
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ArrayPortalFromIterators(IteratorT begin, IteratorT end)
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: BeginIterator(begin)
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{
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typename std::iterator_traits<IteratorT>::difference_type numberOfValues =
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std::distance(begin, end);
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VTKM_ASSERT(numberOfValues >= 0);
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#ifndef VTKM_USE_64BIT_IDS
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if (numberOfValues > (std::numeric_limits<vtkm::Id>::max)())
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{
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throw vtkm::cont::ErrorBadAllocation(
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"Distance of iterators larger than maximum array size. "
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"To support larger arrays, try turning on VTKM_USE_64BIT_IDS.");
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}
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#endif // !VTKM_USE_64BIT_IDS
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this->NumberOfValues = static_cast<vtkm::Id>(numberOfValues);
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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_EXEC_CONT ArrayPortalFromIterators(const ArrayPortalFromIterators<OtherIteratorT>& src)
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: BeginIterator(src.GetIteratorBegin())
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, NumberOfValues(src.GetNumberOfValues())
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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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vtkm::Id GetNumberOfValues() const { return this->NumberOfValues; }
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT
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ValueType Get(vtkm::Id index) const { return *this->IteratorAt(index); }
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT
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void Set(vtkm::Id index, const ValueType& value) const { *(this->BeginIterator + index) = value; }
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT
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IteratorT GetIteratorBegin() const { return this->BeginIterator; }
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT
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IteratorT GetIteratorEnd() const
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{
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IteratorType iterator = this->BeginIterator;
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using difference_type = typename std::iterator_traits<IteratorType>::difference_type;
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iterator += static_cast<difference_type>(this->NumberOfValues);
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return iterator;
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}
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private:
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IteratorT BeginIterator;
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vtkm::Id NumberOfValues;
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT
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IteratorT IteratorAt(vtkm::Id index) const
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{
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VTKM_ASSERT(index >= 0);
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VTKM_ASSERT(index < this->GetNumberOfValues());
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return this->BeginIterator + index;
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}
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};
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template <class IteratorT>
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class ArrayPortalFromIterators<IteratorT,
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typename std::enable_if<std::is_const<
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typename std::remove_pointer<IteratorT>::type>::value>::type>
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{
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public:
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using ValueType = typename std::iterator_traits<IteratorT>::value_type;
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using IteratorType = IteratorT;
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT
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ArrayPortalFromIterators()
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: BeginIterator(nullptr)
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, NumberOfValues(0)
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{
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}
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_CONT
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ArrayPortalFromIterators(IteratorT begin, IteratorT end)
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: BeginIterator(begin)
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{
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typename std::iterator_traits<IteratorT>::difference_type numberOfValues =
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std::distance(begin, end);
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VTKM_ASSERT(numberOfValues >= 0);
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#ifndef VTKM_USE_64BIT_IDS
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if (numberOfValues > (std::numeric_limits<vtkm::Id>::max)())
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{
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throw vtkm::cont::ErrorBadAllocation(
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"Distance of iterators larger than maximum array size. "
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"To support larger arrays, try turning on VTKM_USE_64BIT_IDS.");
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}
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#endif // !VTKM_USE_64BIT_IDS
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this->NumberOfValues = static_cast<vtkm::Id>(numberOfValues);
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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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VTKM_SUPPRESS_EXEC_WARNINGS
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template <class OtherIteratorT>
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VTKM_EXEC_CONT ArrayPortalFromIterators(const ArrayPortalFromIterators<OtherIteratorT>& src)
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: BeginIterator(src.GetIteratorBegin())
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, NumberOfValues(src.GetNumberOfValues())
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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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vtkm::Id GetNumberOfValues() const { return this->NumberOfValues; }
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT
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ValueType Get(vtkm::Id index) const { return *this->IteratorAt(index); }
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT
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IteratorT GetIteratorBegin() const { return this->BeginIterator; }
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT
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IteratorT GetIteratorEnd() const
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{
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using difference_type = typename std::iterator_traits<IteratorType>::difference_type;
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IteratorType iterator = this->BeginIterator;
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iterator += static_cast<difference_type>(this->NumberOfValues);
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return iterator;
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}
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private:
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IteratorT BeginIterator;
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vtkm::Id NumberOfValues;
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT
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IteratorT IteratorAt(vtkm::Id index) const
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{
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VTKM_ASSERT(index >= 0);
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VTKM_ASSERT(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 //vtk_m_cont_internal_ArrayPortalFromIterators_h
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