Finite Element Assembly Using an Embedded Domain Specific Language

Listing 4

Functor to evaluate the shape functions.

()  struct eval_shape_func: proto::callable

()  {

()   // C++ result_of declaration

()   template<typename Signature>

()   struct result;

()  

()   // C++ result_of implementation

()   template<class ThisT, typename DataT>

()   struct result<ThisT(DataT)>

() {

()   typedef const typename

()    boost::remove_reference<DataT>::type::element_t::shape_func_t& type;

() };

()  

() template<typename DataT>

() const typename DataT::element_t::shape_func_t& operator()(DataT& data) const

() {

()   // Return a reference to the result, stored in data

()   return data.shape_func;

() }

()  };