From: Timo Heister Date: Mon, 28 Sep 2020 18:18:47 +0000 (-0400) Subject: code cleanup periodic face accessors X-Git-Tag: v9.3.0-rc1~1043^2 X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F10976%2Fhead;p=dealii.git code cleanup periodic face accessors --- diff --git a/source/grid/tria_accessor.cc b/source/grid/tria_accessor.cc index 0720118b28..80ac4c3c49 100644 --- a/source/grid/tria_accessor.cc +++ b/source/grid/tria_accessor.cc @@ -2568,29 +2568,17 @@ CellAccessor::has_periodic_neighbor( * faces we mainly use the Triangulation::periodic_face_map to find the * information about periodically connected faces. So, we actually search in * this std::map and return the cell_face on the other side of the periodic - * boundary. For this search process, we have two options: + * boundary. * - * 1- Using the [] operator of std::map: This option results in a more - * readalbe code, but requires an extra iteration in the map. Because when we - * call [] on std::map, with a key which does not exist in the std::map, that - * key will be created and the default value will be returned by []. This is - * not desirable. So, one has to first check if the key exists in the std::map - * and if it exists, then use the [] operator. The existence check is possible - * using std::map::find() or std::map::count(). Using this option will result - * in two iteration cycles through the map. First, existence check, then - * returning the value. - * - * 2- Using std::map::find(): This option is less readable, but theoretically - * faster, because it results in one iteration through std::map object. - * - * We decided to use the 2nd option. + * We can not use operator[] as this would insert non-existing entries or + * would require guarding with an extra std::map::find() or count(). */ AssertIndexRange(i_face, this->n_faces()); using cell_iterator = TriaIterator>; - // my_it : is the iterator to the current cell. - cell_iterator my_it(*this); + + cell_iterator current_cell(*this); if (this->tria->periodic_face_map.find( - std::pair(my_it, i_face)) != + std::make_pair(current_cell, i_face)) != this->tria->periodic_face_map.end()) return true; return false; @@ -2612,14 +2600,12 @@ CellAccessor::periodic_neighbor(const unsigned int i_face) const */ AssertIndexRange(i_face, this->n_faces()); using cell_iterator = TriaIterator>; - cell_iterator my_it(*this); + cell_iterator current_cell(*this); + + auto my_face_pair = + this->tria->periodic_face_map.find(std::make_pair(current_cell, i_face)); - const typename std::map, - std::pair, - std::bitset<3>>>::const_iterator - my_face_pair = this->tria->periodic_face_map.find( - std::pair(my_it, i_face)); - // Assertion is required to check that we are actually on a periodic boundary. + // Make sure we are actually on a periodic boundary: Assert(my_face_pair != this->tria->periodic_face_map.end(), TriaAccessorExceptions::ExcNoPeriodicNeighbor()); return my_face_pair->second.first.first; @@ -2665,11 +2651,9 @@ CellAccessor::periodic_neighbor_child_on_subface( AssertIndexRange(i_face, this->n_faces()); using cell_iterator = TriaIterator>; cell_iterator my_it(*this); - const typename std::map, - std::pair, - std::bitset<3>>>::const_iterator - my_face_pair = this->tria->periodic_face_map.find( - std::pair(my_it, i_face)); + + auto my_face_pair = + this->tria->periodic_face_map.find(std::make_pair(my_it, i_face)); /* * There should be an assertion, which tells the user that this function * should not be used for a cell which is not located at a periodic boundary. @@ -2719,11 +2703,9 @@ CellAccessor::periodic_neighbor_of_coarser_periodic_neighbor( using cell_iterator = TriaIterator>; const int my_face_index = this->face_index(i_face); cell_iterator my_it(*this); - const typename std::map, - std::pair, - std::bitset<3>>>::const_iterator - my_face_pair = this->tria->periodic_face_map.find( - std::pair(my_it, i_face)); + + auto my_face_pair = + this->tria->periodic_face_map.find(std::make_pair(my_it, i_face)); /* * There should be an assertion, which tells the user that this function * should not be used for a cell which is not located at a periodic boundary. @@ -2732,11 +2714,9 @@ CellAccessor::periodic_neighbor_of_coarser_periodic_neighbor( TriaAccessorExceptions::ExcNoPeriodicNeighbor()); cell_iterator nb_it = my_face_pair->second.first.first; unsigned int face_num_of_nb = my_face_pair->second.first.second; - const typename std::map, - std::pair, - std::bitset<3>>>::const_iterator - nb_face_pair = this->tria->periodic_face_map.find( - std::pair(nb_it, face_num_of_nb)); + + auto nb_face_pair = + this->tria->periodic_face_map.find(std::make_pair(nb_it, face_num_of_nb)); /* * Since, we store periodic neighbors for every cell (either active or * artificial or inactive) the nb_face_pair should also be mapped to some @@ -2750,15 +2730,15 @@ CellAccessor::periodic_neighbor_of_coarser_periodic_neighbor( for (unsigned int i_subface = 0; i_subface < parent_face_it->n_children(); ++i_subface) if (parent_face_it->child_index(i_subface) == my_face_index) - return (std::pair(face_num_of_nb, i_subface)); + return std::make_pair(face_num_of_nb, i_subface); /* * Obviously, if the execution reaches to this point, some of our assumptions * should have been false. The most important one is, the user has called this * function on a face which does not have a coarser periodic neighbor. */ Assert(false, TriaAccessorExceptions::ExcNeighborIsNotCoarser()); - return std::pair(numbers::invalid_unsigned_int, - numbers::invalid_unsigned_int); + return std::make_pair(numbers::invalid_unsigned_int, + numbers::invalid_unsigned_int); } @@ -2809,11 +2789,9 @@ CellAccessor::periodic_neighbor_face_no( AssertIndexRange(i_face, this->n_faces()); using cell_iterator = TriaIterator>; cell_iterator my_it(*this); - const typename std::map, - std::pair, - std::bitset<3>>>::const_iterator - my_face_pair = this->tria->periodic_face_map.find( - std::pair(my_it, i_face)); + + auto my_face_pair = + this->tria->periodic_face_map.find(std::make_pair(my_it, i_face)); /* * There should be an assertion, which tells the user that this function * should not be called for a cell which is not located at a periodic boundary @@ -2851,24 +2829,21 @@ CellAccessor::periodic_neighbor_is_coarser( AssertIndexRange(i_face, this->n_faces()); using cell_iterator = TriaIterator>; cell_iterator my_it(*this); - const typename std::map, - std::pair, - std::bitset<3>>>::const_iterator - my_face_pair = this->tria->periodic_face_map.find( - std::pair(my_it, i_face)); + + auto my_face_pair = + this->tria->periodic_face_map.find(std::make_pair(my_it, i_face)); /* * There should be an assertion, which tells the user that this function * should not be used for a cell which is not located at a periodic boundary. */ Assert(my_face_pair != this->tria->periodic_face_map.end(), TriaAccessorExceptions::ExcNoPeriodicNeighbor()); + cell_iterator nb_it = my_face_pair->second.first.first; unsigned int face_num_of_nb = my_face_pair->second.first.second; - const typename std::map, - std::pair, - std::bitset<3>>>::const_iterator - nb_face_pair = this->tria->periodic_face_map.find( - std::pair(nb_it, face_num_of_nb)); + + auto nb_face_pair = + this->tria->periodic_face_map.find(std::make_pair(nb_it, face_num_of_nb)); /* * Since, we store periodic neighbors for every cell (either active or * artificial or inactive) the nb_face_pair should also be mapped to some