Hello everyone! This is deal.II newsletter #283. It automatically reports recently merged features and discussions about the deal.II finite element library.
## Below you find a list of recently proposed or merged features: #16998: Fix Compiler warning in `tria.cc` (proposed by dominiktassilostill; merged) https://github.com/dealii/dealii/pull/16998 #16996: Introduce concepts that matrix template arguments have to satisfy. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/16996 #16995: Annotate solver classes with vector space vector concept. (proposed by bangerth) https://github.com/dealii/dealii/pull/16995 #16994: Add a few more tests for the tutorials (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/16994 #16993: Introduce FullMatrix::compress() (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/16993 #16992: Fix DEAL_II_ARBORX_CXX20_BUG check (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/16992 #16991: Name a template argument VectorType as per usual. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/16991 #16990: Zap step-12b. (proposed by bangerth) https://github.com/dealii/dealii/pull/16990 #16989: Test step-67 and step-76 tutorial programs (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/16989 #16988: add tests/examples/step-77 (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/16988 #16987: Get rid of the use of deallog in step-3 and friends. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/16987 #16986: Remove unnecessary references to logstream.h. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/16986 #16985: MatrixFree: Switch ShapeInfo from VectorizedArray<Number> to Number type (proposed by kronbichler) https://github.com/dealii/dealii/pull/16985 #16984: Tensor product operations: Use loop unrolling for slow mat-vec (proposed by kronbichler) https://github.com/dealii/dealii/pull/16984 #16983: add tests/examples/step-15 (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/16983 #16982: Matrix-free evaluation kernels: Do not template tensor_none case (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/16982 #16981: step-15: use AffineConstraints for boundary values (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/16981 #16979: Better default ctor for MGLevelObject (proposed by RichardYCJ) https://github.com/dealii/dealii/pull/16979 #16977: Restructure WorkStream slightly. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/16977 #16976: Use taskflow to create asynchronous tasks. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/16976 #16973: Mark an input argument as 'const', and in the process give it a reasonable type. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/16973 #16972: autopilot distclean: also remove `compile_commands.json`. (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/16972 #16971: Rename a poorly named variable. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/16971 #16970: FEEvaluation for simplices: Arrange gradients contiguously (proposed by kronbichler) https://github.com/dealii/dealii/pull/16970 #16969: Clarify a comment in step-77. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/16969 #16968: Make finite element objects 'const'. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/16968 #16967: step-77: use AffineConstraints only (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/16967 #16966: Fix FEEvaluation gradient layout in step-76 tutorial program (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/16966 #16965: Remove extra orientation functions (proposed by drwells; merged) https://github.com/dealii/dealii/pull/16965 #16964: Add template argument to VectorTools::compute_no_normal_flux_constraints() (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/16964 #16961: Mark FEValuesExtractors objects as 'const' in the tests/ directory. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/16961 #16960: Make many more variables 'const'. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/16960 #16959: Fix MG Transfer for Tetrahedrons (proposed by dominiktassilostill) https://github.com/dealii/dealii/pull/16959 #16958: FEPointEvaluation: Use separate reinit function for clearer separation (proposed by kronbichler) https://github.com/dealii/dealii/pull/16958 #16957: Include allocated vectors in GrowingVectorMemory's memory consumption (proposed by sebproell; merged) https://github.com/dealii/dealii/pull/16957 #16954: Consistently use a relative solver tolerance. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/16954 #16940: Fix p:f:T::load() (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/16940 #16932: NonMatching::FEValues: accept CellAccessor (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/16932 #16892: Import TaskFlow 3.7.0. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/16892 ## And this is a list of recently opened or closed discussions: #16999: Regression tester regressed 10eeb3 (opened) https://github.com/dealii/dealii/issues/16999 #16997: Regression tester regressed b0fa98 (opened) https://github.com/dealii/dealii/issues/16997 #16980: Regression tester regressed 549a7a (opened) https://github.com/dealii/dealii/issues/16980 #16978: MGLevelObject prevents default construct (opened) https://github.com/dealii/dealii/issues/16978 #16975: Raise error when DSP is used without IndexSet (opened) https://github.com/dealii/dealii/issues/16975 #16974: Regression tester regressed d97197 (opened and closed) https://github.com/dealii/dealii/issues/16974 #16963: Regression tester regressed 4f3dff (opened) https://github.com/dealii/dealii/issues/16963 #16962: Blocked on mailing list? (opened and closed) https://github.com/dealii/dealii/issues/16962 #16949: Regression tester regressed efb4cd (closed) https://github.com/dealii/dealii/issues/16949 #16946: Remove the use of deallog from step-3. (closed) https://github.com/dealii/dealii/issues/16946 #16618: Update bundled boost (closed) https://github.com/dealii/dealii/issues/16618 A list of all major changes since the last release can be found at https://www.dealii.org/developer/doxygen/deal.II/recent_changes.html. Thanks for being part of the community! Let us know about questions, problems, bugs or just share your experience by writing to dealii@googlegroups.com, or by opening issues or pull requests at https://www.github.com/dealii/dealii. 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