conditional.hh

#ifndef __DUNE_ACFEM_MPL_CONDITIONAL_HH__
#define __DUNE_ACFEM_MPL_CONDITIONAL_HH__
 
namespace Dune {
 
  namespace ACFem {
 
    namespace MPL {
 
      template<bool>
      struct Conditional;
 
      template<>
      struct Conditional<true> {
        template<class A, class B>
        using Type = A;
      };
 
      template <>
      struct Conditional<false> {
        template<class A, class B>
        using Type = B;
      };
 
    }
 
#if 1
    template<bool Cond, class A, class B>
    using ConditionalType = typename MPL::Conditional<Cond>::template Type<A, B>;
#else
    template<bool Cond, class A, class B>
    using ConditionalType = std::conditional_t<Cond, A, B>;
#endif
 
  } // NS ACFem
 
} // NS Dune
 
#endif // __DUNE_ACFEM_MPL_CONDITIONAL_HH__