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https://gitlab.kitware.com/vtk/vtk-m
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c3a3184d51
Sandia National Laboratories recently changed management from the Sandia Corporation to the National Technology & Engineering Solutions of Sandia, LLC (NTESS). The copyright statements need to be updated accordingly.
120 lines
3.0 KiB
C++
120 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 National Technology & Engineering Solutions of Sandia, LLC (NTESS).
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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-NA0003525 with NTESS,
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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_internal_IntegerSequence_h
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#define vtk_m_internal_IntegerSequence_h
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#include <cstdlib>
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namespace vtkm
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{
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namespace internal
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{
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/// \brief A container of unsigned integers
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///
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/// C++11 Doesn't provide an IntegerSequence class and helper constructor
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// So we need to roll our own. This class has been tested up to 512 elements.
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//
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template <int...>
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struct IntegerSequence
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{
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};
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namespace detail
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{
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template <int N, int... Is> //unroll in blocks of 4
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struct MakeSeq /** @cond */ : MakeSeq<N - 4, N - 3, N - 2, N - 1, N, Is...> /** @endcond */
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{
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//The cond/endcond are used to tell doxygen to ignore the inheritance, as that
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//builds a massive inheritance tree
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};
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template <int... Is>
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struct MakeSeq<0, 1, 2, 3, Is...> //termination case
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{
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using type = IntegerSequence<0, 1, 2, 3, Is...>;
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};
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template <int Mod, int N>
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struct PreMakeSeq : MakeSeq<N - 3, N - 2, N - 1, N>
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{
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};
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template <int N> //specialization for value +1 to divisible by 4
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struct PreMakeSeq<1, N> : MakeSeq<N>
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{
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};
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template <int N> //specialization for value +2 to divisible by 4
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struct PreMakeSeq<2, N> : MakeSeq<N - 1, N>
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{
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};
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template <int N> //specialization for value +3 to divisible by 4
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struct PreMakeSeq<3, N> : MakeSeq<N - 2, N - 1, N>
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{
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};
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template <> //specialization for 4
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struct PreMakeSeq<4, 3>
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{
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using type = IntegerSequence<0, 1, 2, 3>;
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};
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template <> //specialization for 3
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struct PreMakeSeq<3, 2>
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{
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using type = IntegerSequence<0, 1, 2>;
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};
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template <> //specialization for 2
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struct PreMakeSeq<2, 1>
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{
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using type = IntegerSequence<0, 1>;
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};
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template <> //specialization for 1
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struct PreMakeSeq<1, 0>
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{
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using type = IntegerSequence<0>;
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};
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template <> //specialization for 0
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struct PreMakeSeq<0, -1>
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{
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using type = IntegerSequence<>;
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};
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} //namespace detail
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/// \brief A helper method to create an Integer sequence of 0...N-1.
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template <int N>
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struct MakeIntegerSequence /** @cond */ : detail::PreMakeSeq<N % 4, N - 1> /** @endcond */
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{
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//The cond/endcond are used to tell doxygen to ignore the inheritance, as that
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//builds a massive inheritance tree
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};
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}
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}
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#endif //vtk_m_internal_IntegerSequence_h
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