From 1429c5b7650a87bbc38825abc3ed129010fdcfbd Mon Sep 17 00:00:00 2001 From: bangerth Date: Sun, 6 Jan 2013 02:03:23 +0000 Subject: [PATCH] Rewrite entry in a bit more detail. git-svn-id: https://svn.dealii.org/trunk@27943 0785d39b-7218-0410-832d-ea1e28bc413d --- deal.II/doc/news/changes.h | 31 +++++++++++++++++++++++-------- 1 file changed, 23 insertions(+), 8 deletions(-) diff --git a/deal.II/doc/news/changes.h b/deal.II/doc/news/changes.h index 44a24b5b29..ce6fd96e03 100644 --- a/deal.II/doc/news/changes.h +++ b/deal.II/doc/news/changes.h @@ -24,6 +24,29 @@ inconvenience this causes.

    +
  1. Changed: deal.II previously had two separate classes, DoFHandler +and MGDoFHandler, for standard and multilevel discretizations, respectively. +There were also corresponding accessor hierarchies for the cell and +face iterators. This turned out to be an obstacle for future developments. +Consequently, the functionality of the MGDoFHandler class has been merged +into the standard DoFHandler (which already was a base class of MGDoFHandler; +moving the functions down in the class hierarchy therefore does not +significantly affect how these classes are used). The MGDoFHandler class +still exists for now, but is deprecated and will be removed in deal.II 8.0. +Use the DoFHandler class instead which has obtained all the functionality of +the old MGDoFHandler class. + +From a user perspective, there is only one significant change: The old +MGDoFHandler::distribute_dofs() function called DoFHandler::distribute_dofs() +and then distributed degrees of freedom on all levels of the multilevel +hierarchy. In the new scheme, this is now achieved using the function +DoFHandler::distribute_mg_dofs(). In other words, where you previously +used the class MGDoFHandler and called MGDoFHandler::distribute_dofs(), you +should now use the class DoFHandler and call first DoFHandler::distribute_dofs() +and then DoFHandler::distribute_mg_dofs(). +
    +(Markus Bürg, Timo Heister, Guido Kanschat, 2013/01/03) +
  2. Removed: The Triangulation and DoFHandler classes had a great number of functions that allowed to get the first and last iterators to cells, faces, lines, quads and hexes overall and on each level of the mesh @@ -108,14 +131,6 @@ never working correctly and it is not used.
      -
    1. Unification of DoFHandler and MGDoFHandler and internal -restructuring of DoFAccessors. MGDofHandler is now deprecated -and will be removed in a future release. Use DoFHandler with -distribute_mg_dofs() instead. -
      -(Markus Bürg, Timo Heister, Guido Kanschat, 2013/01/03) - -
    2. step-6 now uses ConstraintMatrix::distribute_local_to_global() instead of condense(), which is the preferred way to use a ConstraintMatrix (and the only sensible way in parallel). -- 2.39.5