Hello everyone! This is deal.II newsletter #261. 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: #15746: [C++17] Prefer std::is_base_of_v over std::is_base_of::value. (proposed by bangerth) https://github.com/dealii/dealii/pull/15746 #15745: Small markup fixes. (proposed by bangerth) https://github.com/dealii/dealii/pull/15745 #15744: Add missing changelog entry about the improvement to step-68 (proposed by blaisb) https://github.com/dealii/dealii/pull/15744 #15743: Test mpi/petsc_step-27: fix race condition for output file (proposed by tamiko; merged) https://github.com/dealii/dealii/pull/15743 #15740: [C++17] Use std::is_floating_point_v instead of std::is_floating_point<...>::value. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15740 #15739: [C++17] Use std::is_same_v instead of std::is_same<...>::value. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15739 #15737: Copy Tpetra vector if we need to call "sync" (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/15737 #15736: Only warn about deprecated std_cxx17 headers for DEAL_II_EARLY_DEPRECATIONS (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/15736 #15735: Make VectorizedArray::sum() const (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15735 #15734: README.md: update and rearrange badges (proposed by tamiko; merged) https://github.com/dealii/dealii/pull/15734 #15731: Use "empty()" instead of "size() == 0" (proposed by masterleinad) https://github.com/dealii/dealii/pull/15731 #15730: Keep track of constraints we have already determined are finalized. (proposed by bangerth) https://github.com/dealii/dealii/pull/15730 #15729: MatrixFree: Memory consumption of mapping data faces by cells in MappingInfo (proposed by bergbauer; merged) https://github.com/dealii/dealii/pull/15729 #15727: Simplify a few places using cell->as_dof_handler_iterator(..). (proposed by simonsticko; merged) https://github.com/dealii/dealii/pull/15727 #15726: [9.5] bundled/tbb: fix compilation with gcc-13 (proposed by tamiko; merged) https://github.com/dealii/dealii/pull/15726 #15725: bundled/tbb: fix compilation with gcc-13 (proposed by tamiko; merged) https://github.com/dealii/dealii/pull/15725 #15723: Don't use diff option (proposed by tamiko; merged) https://github.com/dealii/dealii/pull/15723 #15722: README.md: reorganize badges in a nice row (proposed by tamiko; merged) https://github.com/dealii/dealii/pull/15722 #15721: tests/examples/ fix script return value (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/15721 #15720: Add 1d support for ArborXWrappers (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/15720 #15719: Testsuite: let run_testsuite() print a summary (proposed by tamiko; merged) https://github.com/dealii/dealii/pull/15719 #15718: empty() function for Quadrature (proposed by bergbauer; merged) https://github.com/dealii/dealii/pull/15718 #15717: Timing step-68: Fix warnings + remove unnecessary mpi call (proposed by blaisb; merged) https://github.com/dealii/dealii/pull/15717 #15716: CMake: remove support for ctest_memcheck() and run_memorycheck.cmake (proposed by tamiko; merged) https://github.com/dealii/dealii/pull/15716 #15715: Re-add LinearAlgebra::set_zero_mean_value(). (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15715 #15713: Some more small AffineConstraints code improvements. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15713 #15711: Recommend NOX for building Trilinos. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15711 #15709: Restrict tests requiring NOX (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/15709 #15708: [9.5] Guard NOX support in include/deal.II/numerics/nonlinear.h (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/15708 #15707: Triangulation::CellStatus: provide proper compatibility type (proposed by tamiko; merged) https://github.com/dealii/dealii/pull/15707 #15706: SolutionTransfer for (de)serializing serial triangulations (proposed by pcafrica) https://github.com/dealii/dealii/pull/15706 #15705: Use readability-qualified-auto clang-tidy check (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/15705 #15704: Guard NOX support in include/deal.II/numerics/nonlinear.h (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/15704 #15702: Fix doc typo (proposed by pcafrica; merged) https://github.com/dealii/dealii/pull/15702 #15700: Instantiate CellAttachedData and CellAttachedDataSerializer (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15700 #15699: Address more unnecessary calls to .c_str(). (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15699 #15697: Fix incorrect subtitles and overloaded member functions in documentation (proposed by RichardYCJ; merged) https://github.com/dealii/dealii/pull/15697 #15696: Minor updates to GridGenerator::hyper_cube_with_cylindrical_hole(). (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15696 #15695: Minor doc update in manifold.cc. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15695 #15694: std::[io]fstream can now deal with std::string for filenames. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15694 #15689: Reorder vertices in the order in which we encounter them in cell loops. (proposed by bangerth) https://github.com/dealii/dealii/pull/15689 #15688: Remove class VectorSpaceVector. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15688 #15687: Assert some basic mesh consistency notions. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15687 #15686: Make sure we always generate consistently oriented meshes. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15686 #15684: CMake: avoid "binding to none" for performance tests (proposed by tamiko; merged) https://github.com/dealii/dealii/pull/15684 #15683: Make sure get_fe_by_name works for simplices. (proposed by luca-heltai; merged) https://github.com/dealii/dealii/pull/15683 #15682: Replace use of C-style array by std::array. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15682 #15681: Update cmake variable documentation (proposed by gassmoeller; merged) https://github.com/dealii/dealii/pull/15681 #15678: Fix face orientation (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15678 #15677: KINSOL: allow for custom setup (proposed by sebproell; merged) https://github.com/dealii/dealii/pull/15677 #15671: Avoid const return type in functions (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/15671 #15667: Remove reference to VectorSpaceVector from ReadWriteVector's documentation. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15667 #15652: github: update linux runners (proposed by tamiko; merged) https://github.com/dealii/dealii/pull/15652 #15610: bundle taskflow 3.6.0 (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/15610 #15576: Unified interface for serializing triangulations. (proposed by pcafrica; merged) https://github.com/dealii/dealii/pull/15576 #15538: Use ArborX for spatial search in `guess_owners_of_entities()` (proposed by fdrmrc; merged) https://github.com/dealii/dealii/pull/15538 ## And this is a list of recently opened or closed discussions: #15742: Performance regression: various grid and particle operations gentoo-userland-clang-16 versus debian-bullseye-gcc-10 (opened) https://github.com/dealii/dealii/issues/15742 #15741: Performance regression: timing-navier_stokes/setup_matrix_free (opened) https://github.com/dealii/dealii/issues/15741 #15738: Can deal.ii include the finite difference method? (opened and closed) https://github.com/dealii/dealii/issues/15738 #15733: Rethink deprecation of the <deal.II/base/std_cxx17/*> header files. (opened and closed) https://github.com/dealii/dealii/issues/15733 #15732: Regression tester regressed 79ac9c (opened and closed) https://github.com/dealii/dealii/issues/15732 #15728: Regression tester regressed 0847ac (opened and closed) https://github.com/dealii/dealii/issues/15728 #15724: Compilation error with gcc-13.0.1/gcc-13.1.1 and bundled tbb (opened and closed) https://github.com/dealii/dealii/issues/15724 #15714: dealii induces unnecessary dependencies (like OpenCascade, sundials) on its users when users are built as shared objects (opened and closed) https://github.com/dealii/dealii/issues/15714 #15712: Warning in performance test step-68 (opened and closed) https://github.com/dealii/dealii/issues/15712 #15710: Optimize product of symmetric tensors (opened) https://github.com/dealii/dealii/issues/15710 #15703: `p::d::SolutionTransfer` for (de)serializing serial triangulations (opened) https://github.com/dealii/dealii/issues/15703 #15701: Strategy with threading: Tasks, parallel for loops, etc (opened) https://github.com/dealii/dealii/issues/15701 #15698: Regression tester regressed 629865 (opened and closed) https://github.com/dealii/dealii/issues/15698 #15693: libdeal_II.so links with libX11.so? (opened and closed) https://github.com/dealii/dealii/issues/15693 #15692: On FreeBSD with external Kokkos with openmp enabled: quicktest failures. (opened and closed) https://github.com/dealii/dealii/issues/15692 #15691: Fixing the display problems of member functions of some classes in documentation (opened and closed) https://github.com/dealii/dealii/issues/15691 #15690: CMake: should warn or indicate that DEAL_II_WITH_KOKKOS and DEAL_II_WITH_BOOST is always on. (opened) https://github.com/dealii/dealii/issues/15690 #15685: Invalid cell connection generated between child cells (opened and closed) https://github.com/dealii/dealii/issues/15685 #15680: Regression tester regressed c61d59 (opened and closed) https://github.com/dealii/dealii/issues/15680 #14405: Potential deadlock in ConsensusAlgorithm::NBX on some systems (closed) https://github.com/dealii/dealii/issues/14405 #8271: [Homepage] Update Survey results from 2016 (closed) https://github.com/dealii/dealii/issues/8271 #8270: [Homepage] https://www.dealii.org/ideas.html (closed) https://github.com/dealii/dealii/issues/8270 #3073: Remove VectorSpaceVector. (closed) https://github.com/dealii/dealii/issues/3073 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! 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