Line data    Source code

       1            0 : // Distributed under the MIT License.
       2              : // See LICENSE.txt for details.
       3              : 
       4              : #pragma once
       5              : 
       6              : #include <type_traits>
       7              : 
       8              : namespace evolution::dg {
       9              : /*!
      10              :  * \brief If `Metavars` has a `SubcellOptions` member struct and
      11              :  * `SubcellOptions::subcell_enabled` is `true` then inherits from
      12              :  * `std::true_type`, otherwise inherits from `std::false_type`.
      13              :  *
      14              :  * \note This check is intentionally not inside the `DgSubcell` library so that
      15              :  * executables that do not use subcell do not need to link against it.
      16              :  */
      17              : template <typename Metavars, typename = std::void_t<>>
      18            1 : struct using_subcell : std::false_type {};
      19              : 
      20              : /// \cond
      21              : template <typename Metavars>
      22              : struct using_subcell<Metavars, std::void_t<typename Metavars::SubcellOptions>>
      23              :     : std::bool_constant<Metavars::SubcellOptions::subcell_enabled> {};
      24              : /// \endcond
      25              : 
      26              : /*!
      27              :  * \brief If `Metavars` has a `SubcellOptions` member struct and
      28              :  * `SubcellOptions::subcell_enabled` is `true` then is `true`, otherwise
      29              :  * `false`.
      30              :  *
      31              :  * \note This check is intentionally not inside the `DgSubcell` library so that
      32              :  * executables that do not use subcell do not need to link against it.
      33              :  */
      34              : template <typename Metavars>
      35            1 : constexpr bool using_subcell_v = using_subcell<Metavars>::value;
      36              : }  // namespace evolution::dg