modernize type traits

apps/benchmarks/FreeSurfaceAdvection/DeformationField.cpp

@@ -61,7 +61,7 @@ using PdfCommunication_T    = blockforest::SimpleCommunication< LatticeModelSten
 // the geometry computations in SurfaceGeometryHandler require meaningful values in the ghost layers in corner
 // directions (flag field and fill level field); this holds, even if the lattice model uses a D3Q19 stencil
 using CommunicationStencil_T =
-   typename std::conditional< LatticeModel_T::Stencil::D == uint_t(2), stencil::D2Q9, stencil::D3Q27 >::type;
+   std::conditional_t< LatticeModel_T::Stencil::D == uint_t(2), stencil::D2Q9, stencil::D3Q27 >;
 using Communication_T = blockforest::SimpleCommunication< CommunicationStencil_T >;
 
 using flag_t                        = uint32_t;