mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-10-06 02:18:58 +00:00
82 lines
2.6 KiB
C++
82 lines
2.6 KiB
C++
//============================================================================
|
|
// Copyright (c) Kitware, Inc.
|
|
// All rights reserved.
|
|
// See LICENSE.txt for details.
|
|
// This software is distributed WITHOUT ANY WARRANTY; without even
|
|
// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
|
|
// PURPOSE. See the above copyright notice for more information.
|
|
//
|
|
// Copyright 2014 Sandia Corporation.
|
|
// Copyright 2014 UT-Battelle, LLC.
|
|
// Copyright 2014 Los Alamos National Security.
|
|
//
|
|
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
|
|
// the U.S. Government retains certain rights in this software.
|
|
//
|
|
// Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
|
|
// Laboratory (LANL), the U.S. Government retains certain rights in
|
|
// this software.
|
|
//============================================================================
|
|
|
|
#ifndef vtk_m_internal_IntegerSequence_h
|
|
#define vtk_m_internal_IntegerSequence_h
|
|
|
|
#include <cstdlib>
|
|
|
|
namespace vtkm {
|
|
namespace internal {
|
|
|
|
/// \brief A container of unsigned integers
|
|
///
|
|
/// C++11 Doesn't provide an IntegerSequence class and helper constructor
|
|
// So we need to roll our own. This class has been tested up to 512 elements.
|
|
//
|
|
template<int...> struct IntegerSequence{};
|
|
|
|
namespace detail {
|
|
|
|
template<int N, int... Is> //unroll in blocks of 4
|
|
struct MakeSeq : MakeSeq<N-4, N-3, N-2, N-1, N, Is...> {};
|
|
|
|
template<int... Is>
|
|
struct MakeSeq<0,1,2,3,Is...> //termination case
|
|
{ using type = IntegerSequence<0,1,2,3,Is...>; };
|
|
|
|
template<int Mod, int N>
|
|
struct PreMakeSeq : MakeSeq<N-3, N-2, N-1, N> {};
|
|
|
|
template<int N> //specialization for value +1 to divisible by 4
|
|
struct PreMakeSeq<1,N> : MakeSeq<N> {};
|
|
|
|
template<int N> //specialization for value +2 to divisible by 4
|
|
struct PreMakeSeq<2,N> : MakeSeq<N-1,N> {};
|
|
|
|
template<int N> //specialization for value +3 to divisible by 4
|
|
struct PreMakeSeq<3,N> : MakeSeq<N-2,N-1,N> {};
|
|
|
|
template<> //specialization for 4
|
|
struct PreMakeSeq<4,3> { using type = IntegerSequence<0,1,2,3>; };
|
|
|
|
template<> //specialization for 3
|
|
struct PreMakeSeq<3,2> { using type = IntegerSequence<0,1,2>; };
|
|
|
|
template<> //specialization for 2
|
|
struct PreMakeSeq<2,1> { using type = IntegerSequence<0,1>; };
|
|
|
|
template<> //specialization for 1
|
|
struct PreMakeSeq<1,0> { using type = IntegerSequence<0>; };
|
|
|
|
template<> //specialization for 0
|
|
struct PreMakeSeq<0,-1> { using type = IntegerSequence<>; };
|
|
|
|
} //namespace detail
|
|
|
|
/// \brief A helper method to create an Integer sequence of 0...N-1.
|
|
template<int N>
|
|
struct MakeIntegerSequence : detail::PreMakeSeq<N%4,N-1> {};
|
|
|
|
}
|
|
}
|
|
|
|
#endif //vtk_m_internal_IntegerSequence_h
|