message: Code review: emplace wo std::make_pair
diff: @@ -273,7 +273,7 @@ class Flag_complex_sparse_matrix {
  // Insert a vertex in the data structure
  void insert_vertex(Vertex_handle vertex, Filtration_value filt_val) {
  - auto result = vertex_to_row_.emplace(std::make_pair(vertex, rows_));
  + auto result = vertex_to_row_.emplace(vertex, rows_);
  // If it was not already inserted - Value won't be updated by emplace if it is already present
  if (result.second) {
  // Initializing the diagonal element of the adjency matrix corresponding to rw_b.
  