Remove constexpr for intel 16 compatibility

src/lbm/list/List.h

@@ -59,13 +59,13 @@ namespace lbm {
 template< typename Stencil, typename Index_T = walberla::uint32_t >
 struct LayoutAoS
 {
-   constexpr LayoutAoS() = delete;
+   LayoutAoS() = delete;
 
-   constexpr static uint_t alignment() { return uint_t(1); } 
-   constexpr static uint_t numFluidCellsToAllocate( const uint_t numFluidCellsRequired ) { return numFluidCellsRequired; }
+   static uint_t alignment() { return uint_t(1); } 
+   static uint_t numFluidCellsToAllocate( const uint_t numFluidCellsRequired ) { return numFluidCellsRequired; }
 
-   constexpr static Index_T getPDFIdx( const uint_t idx, const uint_t f, const uint_t /*N*/ ) { return numeric_cast<Index_T>( idx * Stencil::Size + f ); }
-   constexpr static Index_T getPullIdxIdx( const uint_t idx, const stencil::Direction d, const uint_t /*N*/ )
+   static Index_T getPDFIdx( const uint_t idx, const uint_t f, const uint_t /*N*/ ) { return numeric_cast<Index_T>( idx * Stencil::Size + f ); }
+   static Index_T getPullIdxIdx( const uint_t idx, const stencil::Direction d, const uint_t /*N*/ )
    {  
       WALBERLA_ASSERT_UNEQUAL( d, stencil::C );
       WALBERLA_ASSERT_UNEQUAL( Stencil::idx[d], stencil::INVALID_DIR );
@@ -73,10 +73,10 @@ struct LayoutAoS
       const uint_t f = Stencil::idx[d] - Stencil::noCenterFirstIdx;
       return numeric_cast<Index_T>( idx * ( Stencil::Size - Stencil::noCenterFirstIdx ) + f );
    }
-   constexpr static const real_t *& incPtr( const real_t *& p ) { p += Stencil::Size; return p; }
-   constexpr static real_t *& incPtr( real_t *& p ) { p += Stencil::Size; return p; }
+   static const real_t *& incPtr( const real_t *& p ) { p += Stencil::Size; return p; }
+   static real_t *& incPtr( real_t *& p ) { p += Stencil::Size; return p; }
 
-   constexpr static Index_T & incIdx( Index_T & idx ) { idx += numeric_cast<Index_T>( Stencil::Size ); return idx; }
+   static Index_T & incIdx( Index_T & idx ) { idx += numeric_cast<Index_T>( Stencil::Size ); return idx; }
 };
 
 
@@ -85,10 +85,10 @@ struct LayoutSoA
 {
    static_assert( ( ( ALIGNMENT & ( ALIGNMENT - uint_t( 1 ) ) ) == 0 ) && ( ALIGNMENT >= uint_t(1) ), "The alignment for the SoA list layout has to a power of two!" );
 
-   constexpr LayoutSoA() = delete;
+   LayoutSoA() = delete;
 
-   constexpr static uint_t alignment() { return ALIGNMENT; }
-   constexpr static uint_t numFluidCellsToAllocate( const uint_t numFluidCellsRequired )
+   static uint_t alignment() { return ALIGNMENT; }
+   static uint_t numFluidCellsToAllocate( const uint_t numFluidCellsRequired )
    { 
       uint_t alignedStepSize = std::max( uint_t(1), alignment() / sizeof( real_t ) );
       if( ( numFluidCellsRequired % alignedStepSize ) == 0 )
@@ -97,8 +97,8 @@ struct LayoutSoA
          return ( numFluidCellsRequired / alignedStepSize + uint_t(1) ) * alignedStepSize;
    }
 
-   constexpr static Index_T getPDFIdx( const uint_t idx, const uint_t f, const uint_t N ) { return numeric_cast<Index_T>( f * N + idx ); }
-   constexpr static Index_T getPullIdxIdx( const uint_t idx, const stencil::Direction d, const uint_t N )
+   static Index_T getPDFIdx( const uint_t idx, const uint_t f, const uint_t N ) { return numeric_cast<Index_T>( f * N + idx ); }
+   static Index_T getPullIdxIdx( const uint_t idx, const stencil::Direction d, const uint_t N )
    {  
       WALBERLA_ASSERT_UNEQUAL( d, stencil::C );
       WALBERLA_ASSERT_UNEQUAL( Stencil::idx[d], stencil::INVALID_DIR );
@@ -106,9 +106,9 @@ struct LayoutSoA
       const uint_t f = Stencil::idx[d] - Stencil::noCenterFirstIdx;
       return numeric_cast<Index_T>( f * N + idx );
    }
-   constexpr static const real_t *& incPtr( const real_t *& p ) { ++p; return p; }
-   constexpr static real_t *& incPtr( real_t *& p ) { ++p; return p; }
-   constexpr static Index_T & incIdx( Index_T & idx ) { ++idx; return idx; }
+   static const real_t *& incPtr( const real_t *& p ) { ++p; return p; }
+   static real_t *& incPtr( real_t *& p ) { ++p; return p; }
+   static Index_T & incIdx( Index_T & idx ) { ++idx; return idx; }
 };
 
 struct CellToIdxOrdering