Reference documentation for deal.II version 9.4.1

#include <deal.II/differentiation/ad/ad_helpers.h>
Public Types  
template<int , int dim, typename NumberType >  
using  type = SymmetricTensor< 2, dim, NumberType > 
An intermediate helper struct that defines the return type of Hessian (second derivative) calculations of scalar fields with respect to fields defined by the two extractortype template parameters. This particular specialization is for taking the first derivative with respect to a scalar field, and the second with respect to a symmetric tensor field.
Definition at line 2247 of file ad_helpers.h.
using Differentiation::AD::internal::HessianType< FEValuesExtractors::Scalar, FEValuesExtractors::SymmetricTensor< 2 > >::type = SymmetricTensor<2 , dim, NumberType> 
The type associated with computing the gradient of a scalar field with respect to the given ExtractorType_Row = FEValuesExtractors::Scalar
followed by the ExtractorType_Col = FEValuesExtractors::SymmetricTensor<2>
.
Definition at line 2259 of file ad_helpers.h.