ndarray.h

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// ------------------------------------------------------------------------
//
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2021 - 2023 by the deal.II authors
//
// This file is part of the deal.II library.
//
// Part of the source code is dual licensed under Apache-2.0 WITH
// LLVM-exception OR LGPL-2.1-or-later. Detailed license information
// governing the source code and code contributions can be found in
// LICENSE.md and CONTRIBUTING.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