# dune-uggrid 2.10 (unreleased)

* Remove deprecated `AllocEnvMemory` and `FreeEnvMemory`. They were
wrappers of standard `malloc` and `free`.

* Remove deprecated `Mark` and `Release`. Use `MarkTmpMem` and
`ReleaseTmpMem` instead.

* Remove deprecated `HeapAllocMode` and its flags `FROM_BOTTOM` and `FROM_TOP`.
They lost any influence, as we use the system heap.

* Remove deprecated `DDD_InfoProcList`, use `DDD_InfoProcListRange` instead.

# dune-uggrid 2.9 (2022-11-25)

* The `dune-uggrid` module does not set the preprocessor flag `HAVE_UG` anymore.
Use `HAVE_DUNE_UGGRID` instead.
* Several unused data members have been removed from the `UGGrid` data structure.
The grids will behave as before, but the memory footprint should be a bit smaller.

# dune-uggrid 2.8 (2021-09-06)

* Added support for All_All communication on facets.
* Removes support for `_2` and `_3` macros.
* Remove support for XDR.

# dune-uggrid 2.7.0 (2019-12-20)

* Multiple grids are now also allowed in the parallel implementation
[!96]: https://gitlab.dune-project.org/staging/dune-uggrid/merge_requests/96

* The `TET_RULESET` compile-time option has been renamed to
`DUNE_UGGRID_TET_RULESET` and is enabled by default.
It is no longer necessary to provide the `RefRules.data` file.
[!134](https://gitlab.dune-project.org/staging/dune-uggrid/merge_requests/134)

* Header files moved below dune/uggrid. Headers are installed in the same
sub-directory and no longer into ug/. This breaks compatibility to UG 3.13.
[!137](https://gitlab.dune-project.org/staging/dune-uggrid/merge_requests/137)

# dune-uggrid 2.6.0 (2018-04-03)

* Transfer of element data during load balancing is supported.
See [!55][] and [dune-grid!172][]
* `dune-uggrid` has gained a new build-time switch `TET_RULESET` (default is off).
When set, `UGGrid` will use a better algorithm to compute green closures for red--green
grid refinement. This better algorithm, which involves a complete rule set
for tetrahedral elements, leads to refined grids with smaller closures.
It also fixes at least one [bug](https://gitlab.dune-project.org/core/dune-grid/issues/27).
*Beware:* when `TET_RULESET` is set, UG wants to read a table from the file `RefRule.data`
(in `uggrid/lib/ugdata`). This file needs to be in the current directory, otherwise `UGGrid`
will abort. The long-term plan is to compile the data file into the binary, and make
the new closure algorithm the default.
* Many now unused parts of UG have been removed from the source.
* The memory management of UG got a major overhaul:
- As malloc/free memory management was used for a long time, we removed
the manual heap management of UG.
- `DYNAMIC_MEMORY_ALLOCMODEL` was used by default, now we removed the
switch and cleaned up all `#ifdef`s
- The `FROM_BOTTOM`/`FROM_TOP` flags during memory allocation didn't have
any influence, as we use the system heap. The enums were deprecated
and the interface updated.
- unified the different memory allocation methods
- removed user data from the `MULTIGRID` structure
- removed virtual heap management
* The `InsertElement` algorithm has been completely rewritten. Up to now the user
had to ensure that enough memory was allocated in order to create a
lookup for the `InsertElement` neighbor search. This was necessary to
ensure an O(n) complexity. Otherwise loading large meshes was
prohibitively slow. The new implementation uses modern C++ data
structures. To speed up the neighbor search we maintain a hash-map
(i.e. `unordered_map`) from a face to an element. The new
implementation is as fast as the old one, can dynamically adapt to
the mesh size and uses less memory.

See the list of all [dune-uggrid 2.6 merge requests][] for minor
changes not mentioned here.

[!55]: https://gitlab.dune-project.org/staging/dune-uggrid/merge_requests/55
[dune-grid!172]: https://gitlab.dune-project.org/core/dune-grid/merge_requests/172
[dune-uggrid 2.6 merge requests]: https://gitlab.dune-project.org/staging/dune-uggrid/merge_requests?milestone_title=Dune+2.6.0&scope=all&state=all

# dune-uggrid 2.5.0 (2017-12-18)

* dune-uggrid is now a DUNE module that will only contain UG's grid
manager in the future.
* Switch to CMake build system.

# UG Release 3.13.0 (01-03-2016)

* Rename macros `_2` and `_3` to `UG_DIM_2` and `UG_DIM_3` respectively,
to avoid clashes with symbols of the same name in libc++.
* Add file `.gitlab-ci.yml` to drive the Gitlab continuous integration features
* Remove an obsolete XCode project file, and an obsolete mystery file 'conf.h'
* Fix an out-of-bounds array access reported by the gcc sanitizer

# UG Release 3.12.1 (11-05-2015)

* Fix bug in `Makefile.am` which prevented building of tarballs.

# UG Release 3.12.0 (11-05-2015)

The major change in this release is the official transformation of the
entire code base to C++. While pretty much everybody (read: all Dune users)
has compiled UG as C++ for many years now, the code itself was still
officially C. In the 3.12.0 release all .c files have now been renamed
to .cc, and UG will hence build as C++ by default.
Thanks to Christoph Grüninger.

* Remove code that redefines standard types on specific architectures
(Fixes Debian build problems of dune-grid)
* Fix various problems when compiling with clang
* Fix the return type of a few methods that don't actually return anything.
* Removal of dead and redundant code
* Minor cleanup and beautifications in ddd

# UG Release 3.11.1 (2-12-2014)

This is mainly a bugfix release. As the only behavioral change, memory
management now defaults to the operating system heap, rather than the
built-in heap. This eases debugging and appears to speed up the code.

* Make method `CreateLine` return `void` instead of `INT`.
This fixes a segfault when compiling with clang.
Thanks to Carsten Gräser.
* More build system and other cleanup

# UG Release 3.11.0 (12-06-2014)

This release contains several bugfixes related to dynamic load balancing.
It also contains many important cleanup patches (kudos to Ansgar Burchardt).

* Properly set `SideVector` `VCOUNT` fields after load balancing
(Dune FlySpray 810: https://dune-project.org/flyspray/index.php?do=details&task_id=810 )
* Bugfix: Always identify MIDNODEs to the proclist of the father edge
* Bugfix: Initialize EDIDENT for edges for 3d _and 2d_ before refinement
* Bugfix: Call the `RestrictPartitioning` method more often before adaptive refinement
* Remove the Fortran interface to the DDD library
* Remove left-overs from the Chaco load balancer which used to be contained
in the UG source tree
* Remove lots of code related to obsolete architectures and the old build system
* Remove old, non-free version of netgen
* Constification in the DDD subsystem
* Various build-system improvements