https://gcc.gnu.org/g:e269268e45ba0befabdfc8a8c2f04dcbb44ccdf4
commit r16-4293-ge269268e45ba0befabdfc8a8c2f04dcbb44ccdf4 Author: Luc Grosheintz <[email protected]> Date: Thu Oct 2 11:27:16 2025 +0200 libstdc++: Implement submdspan_mapping_result. [PR110352] Implement the class submdspan_mapping_result and add it to the std module. PR libstdc++/110352 libstdc++-v3/ChangeLog: * include/std/mdspan (submdspan_mapping_result): New class. * src/c++23/std.cc.in (submdspan_mapping_result): Add. Reviewed-by: Jonathan Wakely <[email protected]> Reviewed-by: Tomasz Kamiński <[email protected]> Signed-off-by: Luc Grosheintz <[email protected]> Diff: --- libstdc++-v3/include/std/mdspan | 7 +++++++ libstdc++-v3/src/c++23/std.cc.in | 3 ++- 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/libstdc++-v3/include/std/mdspan b/libstdc++-v3/include/std/mdspan index 7f69626e4e86..d555b7f2580a 100644 --- a/libstdc++-v3/include/std/mdspan +++ b/libstdc++-v3/include/std/mdspan @@ -361,6 +361,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION [[no_unique_address]] extent_type extent{}; [[no_unique_address]] stride_type stride{}; }; + + template<typename _Mapping> + struct submdspan_mapping_result + { + [[no_unique_address]] _Mapping mapping = _Mapping(); + size_t offset{}; + }; #endif template<typename _IndexType, size_t... _Extents> diff --git a/libstdc++-v3/src/c++23/std.cc.in b/libstdc++-v3/src/c++23/std.cc.in index bfccf3cec956..9cf5fa7dcb62 100644 --- a/libstdc++-v3/src/c++23/std.cc.in +++ b/libstdc++-v3/src/c++23/std.cc.in @@ -1875,8 +1875,9 @@ export namespace std using strided_slice; using full_extent_t; using full_extent; + using submdspan_mapping_result; #endif - // FIXME submdspan_mapping_result, submdspan_extents, mdsubspan + // FIXME submdspan_extents, mdsubspan } #endif
