https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121174
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Given that
#include <mdspan>
int main() {
int v[] = {1, 2, 3, 4, 5, 6};
std::mdspan<int, std::dextents<std::size_t, 2>> view{v, 2, 3};
return 0;
}
compiles, I think more likely
libstdc++-v3/src/c++23/std.cc.in
needs the
// <mdspan>
#if __glibcxx_mdspan
export namespace std
{
using std::extents;
using std::layout_left;
using std::layout_right;
using std::layout_stride;
using std::default_accessor;
using std::mdspan;
// FIXME layout_left_padded, layout_right_padded, aligned_accessor, mdsubspan
}
#endif
part to include
using std::dextents;
and when implemented also
using std::dims;
using std::layout_left_padded;
using std::layout_right_padded;
using std::aligned_accessor;
using std::strided_slice;
using std::submdspan_mapping_result;
using std::full_extent_t;
using std::full_extent;
using std::submdspan_extents;
using std::submdspan;
(not sure if other stuff as well).
r16-442-ga33b5db97c4e87b
added just using std::extents; even when it also added std::dextents.
