mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-10-05 18:08:59 +00:00
284 lines
8.5 KiB
C++
Executable File
284 lines
8.5 KiB
C++
Executable File
//============================================================================
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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/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/ErrorControlBadAllocation.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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namespace cont {
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namespace internal {
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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<
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!std::is_const< typename std::remove_pointer<IteratorT>::type >::value >::type >
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{
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public:
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typedef typename std::iterator_traits<IteratorT>::value_type ValueType;
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typedef IteratorT IteratorType;
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_CONT_EXPORT
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ArrayPortalFromIterators() { }
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_CONT_EXPORT
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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::ErrorControlBadAllocation(
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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_CONT_EXPORT
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ArrayPortalFromIterators(const ArrayPortalFromIterators<OtherIteratorT> &src)
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: BeginIterator(src.GetIteratorBegin()), NumberOfValues(src.GetNumberOfValues())
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{ }
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT_EXPORT
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vtkm::Id GetNumberOfValues() const
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{
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return this->NumberOfValues;
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}
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_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_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT_EXPORT
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void Set(vtkm::Id index, const ValueType& value) const
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{
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*(this->BeginIterator + index) = value;
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}
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT_EXPORT
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IteratorT GetIteratorBegin() const {
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return this->BeginIterator;
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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_EXPORT
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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<
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std::is_const< typename std::remove_pointer<IteratorT>::type >::value >::type >
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{
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public:
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typedef typename std::iterator_traits<IteratorT>::value_type ValueType;
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typedef IteratorT IteratorType;
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_CONT_EXPORT
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ArrayPortalFromIterators() { }
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_CONT_EXPORT
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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::ErrorControlBadAllocation(
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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_CONT_EXPORT
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ArrayPortalFromIterators(const ArrayPortalFromIterators<OtherIteratorT> &src)
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: BeginIterator(src.GetIteratorBegin()), NumberOfValues(src.GetNumberOfValues())
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{ }
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT_EXPORT
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vtkm::Id GetNumberOfValues() const
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{
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return this->NumberOfValues;
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}
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_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_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT_EXPORT
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IteratorT GetIteratorBegin() const {
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return this->BeginIterator;
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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_EXPORT
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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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namespace vtkm {
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namespace cont {
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/// Partial specialization of \c ArrayPortalToIterators for \c
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/// ArrayPortalFromIterators. Returns the original array rather than
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/// the portal wrapped in an \c IteratorFromArrayPortal.
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///
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template<typename _IteratorType>
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class ArrayPortalToIterators<
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vtkm::cont::internal::ArrayPortalFromIterators<_IteratorType> >
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{
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typedef vtkm::cont::internal::ArrayPortalFromIterators<_IteratorType>
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PortalType;
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public:
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#if !defined(VTKM_MSVC) || (defined(_ITERATOR_DEBUG_LEVEL) && _ITERATOR_DEBUG_LEVEL == 0)
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typedef _IteratorType IteratorType;
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT_EXPORT
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ArrayPortalToIterators(const PortalType &portal)
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: Iterator(portal.GetIteratorBegin()),
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NumberOfValues(portal.GetNumberOfValues())
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{ }
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#else // VTKM_MSVC
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// The MSVC compiler issues warnings when using raw pointer math when in
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// debug mode. To keep the compiler happy (and add some safety checks),
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// wrap the iterator in checked_array_iterator.
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typedef stdext::checked_array_iterator<_IteratorType> IteratorType;
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT_EXPORT
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ArrayPortalToIterators(const PortalType &portal)
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: Iterator(portal.GetIteratorBegin(),
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static_cast<size_t>(portal.GetNumberOfValues())),
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NumberOfValues(portal.GetNumberOfValues())
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{ }
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#endif // VTKM_MSVC
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT_EXPORT
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IteratorType GetBegin() const { return this->Iterator; }
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT_EXPORT
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IteratorType GetEnd() const {
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IteratorType iterator = this->Iterator;
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typedef typename std::iterator_traits<IteratorType>::difference_type
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difference_type;
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#if !defined(VTKM_MSVC) || (defined(_ITERATOR_DEBUG_LEVEL) && _ITERATOR_DEBUG_LEVEL == 0)
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std::advance(iterator, static_cast<difference_type>(this->NumberOfValues));
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#else
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//Visual Studio checked iterators throw exceptions when you try to advance
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//nullptr iterators even if the advancement length is zero. So instead
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//don't do the advancement at all
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if(this->NumberOfValues > 0)
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{
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std::advance(iterator, static_cast<difference_type>(this->NumberOfValues));
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}
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#endif
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return iterator;
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}
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private:
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IteratorType Iterator;
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vtkm::Id NumberOfValues;
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};
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}
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} // namespace vtkm::cont
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#endif //vtk_m_cont_internal_ArrayPortalFromIterators_h
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