DimensionalArray.h

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/***************************************************************************
 *  ThunderEgg, a library for solvers on adaptively refined block-structured
 *  Cartesian grids.
 *
 *  Copyright (c) 2021      Scott Aiton
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
 ***************************************************************************/
 
#ifndef THUNDEREGG_DIMENSIONALARRAY_H
#define THUNDEREGG_DIMENSIONALARRAY_H
 
namespace ThunderEgg {
template<int N, template<int> class T>
class DimensionalArray
{
private:
  DimensionalArray<N - 1, T> prev;
  T<N - 1> t;
 
public:
  template<int I>
  T<I>& get()
  {
    static_assert(I < N, "invalid index value");
    if constexpr (I == N - 1) {
      return t;
    } else {
      return prev.template get<I>();
    }
  }
  template<int I>
  const T<I>& get() const
  {
    static_assert(I < N, "invalid index value");
    if constexpr (I == N - 1) {
      return t;
    } else {
      return prev.template get<I>();
    }
  }
};
template<template<int> class T>
class DimensionalArray<1, T>
{
private:
  T<0> t;
 
public:
  template<int I>
  T<I>& get()
  {
    static_assert(I == 0, "invalid index value");
    return t;
  }
  template<int I>
  const T<I>& get() const
  {
    static_assert(I == 0, "invalid index value");
    return t;
  }
};
} // namespace ThunderEgg
#endif