File getndim.h

File List > algebra > helpers > getndim.h

Go to the documentation of this file

#ifndef TEMPLAT_LATTICE_ALGEBRA_HELPERS_GETNDIM_H
#define TEMPLAT_LATTICE_ALGEBRA_HELPERS_GETNDIM_H

/* This file is part of TempLat, available at https://cosmolattice.github.io/templat .
   Copyright 2021-2026 The TempLat authors, see AUTHORS.md.
   Released under the MIT license, see LICENSE.md. */

// File info: Main contributor(s): Franz R. Sattler, Year: 2025

#include "TempLat/lattice/algebra/helpers/isstdgettable.h"
#include "TempLat/lattice/algebra/helpers/istemplatgettable.h"

namespace TempLat
{
  class GetNDim
  {
  public:
    template <typename U>
      requires requires {
        { U::getNDim() } -> std::convertible_to<size_t>;
      }
    static consteval size_t get()
    {
      return U::getNDim();
    }

    template <typename U>
      requires(
          requires { U::NDim; } &&
          !requires {
            { U::getNDim() } -> std::convertible_to<size_t>;
          })
    static consteval size_t get()
    {
      return U::NDim;
    }

    template <typename U>
      requires(
          !requires { U::NDim; } &&
          !requires {
            { U::getNDim() } -> std::convertible_to<size_t>;
          })
    static consteval size_t get()
    {
      return 0;
    }
  };

  template <typename T>
  concept HasNDim = requires {
    { GetNDim::get<T>() } -> std::convertible_to<size_t>;
  };
} // namespace TempLat

#endif