fix a bunch of non standard c++ thanks to clang++

src/algebra/CRSMatrix.hpp

@@ -190,7 +190,7 @@ class CRSMatrix
     Vector<MutableDataType> Ax(m_nb_rows);
 
     parallel_for(
-      m_nb_rows, PUGS_LAMBDA(const IndexType& i_row) {
+      m_nb_rows, PUGS_CLASS_LAMBDA(const IndexType& i_row) {
         const auto row_begin = m_row_map[i_row];
         const auto row_end   = m_row_map[i_row + 1];
         MutableDataType sum{0};