Cleanup

dune/solvers/iterationsteps/blockgsstep.cc

@@ -3,25 +3,19 @@
 
 #include <cassert>
 
+#include <dune/solvers/common/arithmetic.hh>
+
 template<class MatrixType, class DiscFuncType, class BitVectorType>
 inline
 void BlockGSStep<MatrixType, DiscFuncType, BitVectorType>::
 residual(int index, VectorBlock& r) const
 {
-    const MatrixType& mat = *this->mat_;
-    const auto& row = mat[index];
-
     r = (*this->rhs_)[index];
 
-    /* The following loop subtracts
-     * \f[ sum_i = \sum_j A_{ij}w_j \f]
-     */
-    auto cIt    = row.begin();
-    auto cEndIt = row.end();
-
-    for (; cIt!=cEndIt; ++cIt) {
+    const auto& row = (*this->mat_)[index];
+    for (auto cIt = row.begin(); cIt!=row.end(); ++cIt) {
         // r_i -= A_ij x_j
-        cIt->mmv((*this->x_)[cIt.index()], r);
+        Arithmetic::subtractProduct(r, *cIt, (*this->x_)[cIt.index()]);
     }
 
 }