ndarray.h

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// ---------------------------------------------------------------------
//
// Copyright (C) 2021 - 2023 by the deal.II authors
//
// This file is part of the deal.II library.
//
// The deal.II library is free software; you can use it, redistribute
// it, and/or modify it under the terms of the GNU Lesser General
// Public License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// The full text of the license can be found in the file LICENSE.md at
// the top level directory of deal.II.
//
// ---------------------------------------------------------------------
 
#ifndef dealii_ndarray_h
#define dealii_ndarray_h
 
#include <deal.II/base/config.h>
 
#include <deal.II/base/exceptions.h>
 
#include <array>
 
DEAL_II_NAMESPACE_OPEN
 
#ifndef DOXYGEN
namespace internal
{
  namespace ndarray
  {
    // clang-format off
    template <typename T, std::size_t... Ns>
    struct HelperArray;
    // clang-format on
 
    template <typename T, std::size_t N, std::size_t... Ns>
    struct HelperArray<T, N, Ns...>
    {
      using type = std::array<typename HelperArray<T, Ns...>::type, N>;
    };
 
    template <typename T>
    struct HelperArray<T>
    {
      using type = T;
    };
  } // namespace ndarray
} // namespace internal
#endif // DOXYGEN
 
template <typename T, std::size_t... Ns>
using ndarray = typename internal::ndarray::HelperArray<T, Ns...>::type;
 
DEAL_II_NAMESPACE_CLOSE
 
#endif