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| author | Christian Trott <crtrott@sandia.gov> | 2023-05-16 12:38:11 -0700 |
|---|---|---|
| committer | Nikolas Klauser <n_klauser@apple.com> | 2023-05-16 14:30:36 -0700 |
| commit | fcaccf817d31d39096f7d0e7014cd6fe2fa3a683 (patch) | |
| tree | 67d65b900fad74702b04de276fb2f24913cad5c6 /libcxx/docs | |
| parent | 02a029f7fb5a3feae60759eab6a528880e341358 (diff) | |
| download | llvm-fcaccf817d31d39096f7d0e7014cd6fe2fa3a683.tar.gz | |
[libcxx] Add mdspan/extents
This patch adds std::extents. extents is one of the core classes used by std::mdspan. It describes a multi-dimensional index space with a mix of compile time and runtime sizes. Furthermore, it is templated on the index type used to describe the multi-dimensional index space.
The class is designed to be highly optimizable in performance critical code sections, and is fully useable in constant expressions contexts.
Testing of this class tends to be somewhat combinatorical, due to the large number of possible corner cases involved in situations where we have both runtime and compile time extents. To add to this, the class is designed to be interoperable (in particular constructible) from arguments which only need to be convertible to the index_type, but are otherwise arbitrary user types. For a larger discussion on the design of this class refer to: https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p0009r18.html
Co-authored-by: Damien L-G <dalg24@gmail.com>
Reviewed By: ldionne, #libc
Spies: libcxx-commits, H-G-Hristov, tschuett, philnik, arichardson, Mordante, crtrott
Differential Revision: https://reviews.llvm.org/D148067
Diffstat (limited to 'libcxx/docs')
| -rw-r--r-- | libcxx/docs/FeatureTestMacroTable.rst | 2 | ||||
| -rw-r--r-- | libcxx/docs/Status/Cxx2bPapers.csv | 2 |
2 files changed, 3 insertions, 1 deletions
diff --git a/libcxx/docs/FeatureTestMacroTable.rst b/libcxx/docs/FeatureTestMacroTable.rst index 677a71922bd0..0f5ee6c24485 100644 --- a/libcxx/docs/FeatureTestMacroTable.rst +++ b/libcxx/docs/FeatureTestMacroTable.rst @@ -332,6 +332,8 @@ Status ------------------------------------------------- ----------------- ``__cpp_lib_is_scoped_enum`` ``202011L`` ------------------------------------------------- ----------------- + ``__cpp_lib_mdspan`` *unimplemented* + ------------------------------------------------- ----------------- ``__cpp_lib_move_only_function`` *unimplemented* ------------------------------------------------- ----------------- ``__cpp_lib_optional`` ``202110L`` diff --git a/libcxx/docs/Status/Cxx2bPapers.csv b/libcxx/docs/Status/Cxx2bPapers.csv index a310cfc5ff16..550fb34d4b34 100644 --- a/libcxx/docs/Status/Cxx2bPapers.csv +++ b/libcxx/docs/Status/Cxx2bPapers.csv @@ -51,7 +51,7 @@ "`P2442R1 <https://wg21.link/P2442R1>`__","LWG","Windowing range adaptors: ``views::chunk`` and ``views::slide``","February 2022","","","|ranges|" "`P2443R1 <https://wg21.link/P2443R1>`__","LWG","``views::chunk_by``","February 2022","","","|ranges|" "","","","","","","" -"`P0009R18 <https://wg21.link/P0009R18>`__","LWG","mdspan: A Non-Owning Multidimensional Array Reference","July 2022","","" +"`P0009R18 <https://wg21.link/P0009R18>`__","LWG","mdspan: A Non-Owning Multidimensional Array Reference","July 2022","|In progress|","" "`P0429R9 <https://wg21.link/P0429R9>`__","LWG","A Standard ``flat_map``","July 2022","","" "`P1169R4 <https://wg21.link/P1169R4>`__","LWG","``static operator()``","July 2022","|Complete|","16.0" "`P1222R4 <https://wg21.link/P1222R4>`__","LWG","A Standard ``flat_set``","July 2022","","" |