indices.hh

// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
// SPDX-FileCopyrightInfo: Copyright (C) DUNE Project contributors, see file LICENSE.md in module root
// SPDX-License-Identifier: LicenseRef-GPL-2.0-only-with-DUNE-exception
 
#ifndef DUNE_COMMON_INDICES_HH
#define DUNE_COMMON_INDICES_HH
 
#include <cstddef>
#include <type_traits>
#include <utility>
 
#include <dune/common/keywords.hh>
 
namespace Dune
{
  template<std::size_t i>
  using index_constant = std::integral_constant<std::size_t, i>;
 
 
 
  namespace Indices
  {
    DUNE_INLINE_VARIABLE constexpr index_constant< 0>  _0 = {};
 
    DUNE_INLINE_VARIABLE constexpr index_constant< 1>  _1 = {};
 
    DUNE_INLINE_VARIABLE constexpr index_constant< 2>  _2 = {};
 
    DUNE_INLINE_VARIABLE constexpr index_constant< 3>  _3 = {};
 
    DUNE_INLINE_VARIABLE constexpr index_constant< 4>  _4 = {};
 
    DUNE_INLINE_VARIABLE constexpr index_constant< 5>  _5 = {};
 
    DUNE_INLINE_VARIABLE constexpr index_constant< 6>  _6 = {};
 
    DUNE_INLINE_VARIABLE constexpr index_constant< 7>  _7 = {};
 
    DUNE_INLINE_VARIABLE constexpr index_constant< 8>  _8 = {};
 
    DUNE_INLINE_VARIABLE constexpr index_constant< 9>  _9 = {};
 
    DUNE_INLINE_VARIABLE constexpr index_constant<10> _10 = {};
 
    DUNE_INLINE_VARIABLE constexpr index_constant<11> _11 = {};
 
    DUNE_INLINE_VARIABLE constexpr index_constant<12> _12 = {};
 
    DUNE_INLINE_VARIABLE constexpr index_constant<13> _13 = {};
 
    DUNE_INLINE_VARIABLE constexpr index_constant<14> _14 = {};
 
    DUNE_INLINE_VARIABLE constexpr index_constant<15> _15 = {};
 
    DUNE_INLINE_VARIABLE constexpr index_constant<16> _16 = {};
 
    DUNE_INLINE_VARIABLE constexpr index_constant<17> _17 = {};
 
    DUNE_INLINE_VARIABLE constexpr index_constant<18> _18 = {};
 
    DUNE_INLINE_VARIABLE constexpr index_constant<19> _19 = {};
 
  } // namespace Indices
 
  template<class F, class I, I... i>
  decltype(auto) constexpr unpackIntegerSequence(F&& f, std::integer_sequence<I, i...> sequence)
  {
    return f(std::integral_constant<I, i>()...);
  }
 
} //namespace Dune
 
#endif // DUNE_COMMON_INDICES_HH