File: CHANGELOG.md

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# Release 2.7

- The `YaspGrid` class has a new constructor that takes a `Coordinates`
  object as its first argument.  This object can be of type `EquidistantCoordinates`,
  `EquidistantOffsetCoordinates`, or `TensorProductCoordinates`,
  and encapsulates the domain and element sizes.  Previously, this data
  was given directly to different constructors of `YaspGrid`,
  and the constructor had to match the `Coordinates` object used
  as the second template argument of the `YaspGrid` class.
  The new constructor subsumes the previous three, and makes sure
  by design that the correct information is passed at `YaspGrid`
  construction.

- The `GridFactory` exports the type `Communication` and corresponding object
  `comm()` that is used to create the grid. In the `GridFactoryInterface`, this
  defaults to the Communication induced by the process-local communicator
  `MPIHelper::getLocalCommunicator()`, while `UGGrid`'s factory returns the
  Communication of the grid. This can be used to steer the grid creation
  process, see `dune/grid/io/file/gmshreader.hh` for an example.

- The number type used by a `BoundarySegment` is not hard-wired to `double`
  anymore.

- The `Grid::getRealImplementation` member function has been deprecated.
  Use the `impl()` member function of the facade classes directly instead.

- The `AlbertaGrid::getRealIntersection` member function has been deprecated.
  Use the `impl()` member function of the intersection class directly instead.

- The return type of all file reader methods that return a grid has been changed
  from a plain C pointer to the custom pointer class `ToUniquePtr<Grid>`
  (from the `dune-common` module).  Values of this pointer class cast to
  C pointers (but with a deprecation warning), to `std::unique_ptr`, and to
  `std::shared_ptr`.  This marks the beginning of a transition period.
  In the long run, the methods are planned to return objects of type
  `std::unique_ptr`, to make it obvious that the calling code receives
  the ownership of the grid object.  For the time being the calling code
  can still store the return value in a C pointer, but that possibility
  will go away.

- Likewise, the return type of the `GridFactory::createGrid`method has been changed
  from a plain C pointer to the custom pointer class `ToUniquePtr<Grid>`.
  In the long run, the method is planned to return objects of type
  `std::unique_ptr`, to make it obvious that the calling code receives
  the ownership of the grid object.  For the time being the calling code
  can still store the return value in a C pointer, but that possibility
  will go away.  While this procedure allows full backward compatibility
  for code that calls `GridFactory::createGrid`, implementors or third-party
  grid implementations will need to update their implementations of
  `GridFactory::createGrid`.

- The `VTKWriter`s now support custom output data precision for functions
  (via the provided `FieldInfo`), `VTKFunction`s  (via a new virtual interface method `precision()`),
  and coordinates (via an argument to the writer's constructor) that can be
  chosen at runtime. Any field can now choose between VTK's `Float32`, `Float64`,
  `Int32`, `UInt8`, and `UInt32`, represented as `Dune::VTK::Precision::float32`/`float64`/`int32`/`uint8`/`uint32`,
  the `DataArrayWriter` selects the correct type at runtime. The default for
  functions and coordinate is `Float32` as before.

- The `VTKWriter` now supports writing functions that can only be evaluated globally,
  i.e., functions that are not defined with respect to the grid.  Such functions
  will be sampled on the grid vertices (`addVertexData`) or grid element centers (`addCellData`).

- The Capability `hasBackupRestoreFacilities<GeometryGrid<HG, CoordFunction>>`
  now returns `false` in case the `CoordFunction` is not default-constructible.

- The `Geometry` interface now provides the type `Volume` for the return value of the
  method of the same name.  Note that this may be different from `ctype` if you care
  about dimensions.  In that case `ctype` is a length, and not appropriate for
  a quantity that is a volume.

- The `VTKWriter` writer now truncates subnormal floating point values to 0 when writing ASCII files
  (`DUNE::VTK::ascii`). This avoids Paraview crashes on macOS. For this reasons, most VTK files written
  by DUNE 2.7 will differ from the same file written in DUNE 2.6. If you are using VTK files for testing
  results, make sure to use fuzzy float comparisons!

- The `VTKSequenceWriter` now exposes the function `clear()` of the associated `VTKWriter`

- The `VTKSequenceWriter` allows to get and set the time steps storage, which enables serialization
  of a sequence writer. The feature can be used to restart a sequence.

- UG 3.x is no longer supported. Use dune-uggrid instead.

- `UGGrid`: Fixed a bug in the numbering of prism edges.


# Release 2.6

- The deprecated `EntityPointer` has been removed completely and `EntityIterator`
  no longer inherits from it.
  As a consequence, the dimension `EntityIterator::dimension`,
  `EntityIterator::codimension`, and `EntityIterator::mydimension` are gone.

- Experimental grid extensions are now always enabled:

    See core/dune-grid!155

  - The method `impl` and the type `Implementation` on the facade classes are
    always public (and documented), now.
    Warning: Implementation details may change without prior notification.
  - The method experimental grid extension `boundaryId` has been removed from the
    intersection interface. Some grid will continue providing it on their
    implementation, i.e., it may still be accessible through
    ```
    intersection.impl().boundaryId()
    ```
  - The DGF block `general` is now always available and
    the DGFWriter will always write a boundary id and can write user-defined
    boundary data, now.

- `MultipleCodimMultipleGeomTypeMapper`: The `Layout` template parameter has
  been deprecated in favor of a function object that indicates which geometry
  types to include in the mapping.  The layout function
  object is passed in the constructor, so instead of
  ```c++
  MultipleCodimMultipleGeomTypeMapper<GV, MCMGElementLayout> mapper1(gv);
  MultipleCodimMultipleGeomTypeMapper<GV, MCMGVertexLayout> mapper2(gv);
  ```
  please write
  ```c++
  MultipleCodimMultipleGeomTypeMapper<GV> mapper1(gv, mcmgElementLayout());
  MultipleCodimMultipleGeomTypeMapper<GV> mapper2(gv, mcmgVertexLayout());
  ```
  See the doxygen documentation for custom layouts and core/dune-grid!177

- The `MCMGMapper` can now be used to attach multiple dofs to each
  entity:

    See core/dune-grid!215

  - the Layout is passed into the constructor and
    returns the number of dofs to attach to the given geometry type
    ```
       MCMGLayout layout = [](GeometryType gt, int griddim) {
         return gt.dim() == griddim? 2:0;
       };
       MCMGMapper mapper(grid,layout);
    ```
    Note: the layout can still return a `bool` with `true` leading to a single dof being attached.
  - The new method `MCMGMapper::indices(entity)` returns an iterable range
    (instance of `IntegralRange<Index>`)
    with the indices of dofs attached to the given entity:
    ```
      for (const auto& i : mapper.indices(entity) )
        dof = vector[i];
    ```

- Two new method were added to the MCMGMapper:
  `size_type size(GeometryType)` and
  `const std::vector< GeometryType >& types (int codim)`
  returning the number of dofs attached to the geometry type and a vector
  with all geometry types on which dofs are attached, respectively.

    See core/dune-grid!215

- The `StructuredGridFactory` now returns a `unique_ptr` instead of a
  `shared_ptr`.  Code that relies on a `shared_ptr`
  needs to explicitly assign the return value to a `shared_ptr`
  variable.

    See core/dune-grid!212

- `SubsamplingVTKWriter` now supports arbitrary refinements, not just powers
  of two.  The old constructor taking a parameter `int levels` has been
  deprecated, you should now pass a parameter `RefinementIntervals intervals`
  instead.  There are convenience functions `refinementIntervals(int
  intervals)` and `refinementLevels(int levels)` to construct parameters of
  type `RefinementIntervals` in dune-geometry.

    See core/dune-grid!193

- `UGGrid` now supports transferring element data during load balancing.

    See core/dune-grid!172

- A convenience method `referenceElement( entity )` was added.

    See core/dune-grid!349