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